CN117786978A - Method and system for evaluating influence effect of salt rock deposition on thermal evolution of hydrocarbon source rock under salt - Google Patents
Method and system for evaluating influence effect of salt rock deposition on thermal evolution of hydrocarbon source rock under salt Download PDFInfo
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- PCHJSUWPFVWCPO-UHFFFAOYSA-N gold Chemical compound [Au] PCHJSUWPFVWCPO-UHFFFAOYSA-N 0.000 description 1
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Abstract
The invention discloses a method and a system for evaluating the effect of rock salt deposition on the thermal evolution of hydrocarbon source rock under salt, comprising the following steps: and calculating the influence of the salt rock deposition thickness on the temperature of the top surface of the hydrocarbon source rock under salt by using a one-dimensional steady-state heat conduction equation. And establishing a linear relation between the temperature and the depth data, establishing a logarithmic relation between the maturity and the depth data, solving an exponential relation between the maturity and the temperature, and calculating the maturity of the hydrocarbon source rock. And calculating the influence of the change of the thickness of the salt rock deposit on the temperature and the maturity of the top surface of the hydrocarbon source rock by using a one-dimensional steady-state heat conduction equation, and calculating the increase and decrease amount and the change rate of the temperature and the maturity. And inputting the calculated data into a geological information system, and carrying out subsequent analysis and visualization processing. The invention has the advantages that: the reliability and the accuracy of the result are high, the data are visually displayed, the understanding and analysis of people are facilitated, the efficiency is improved, and the manual operation is reduced.
Description
Technical Field
The invention relates to the technical field of petroleum exploration, in particular to a method and a system for quantitatively evaluating the influence effect of salt rock deposition on thermal evolution of hydrocarbon source rock under salt.
Background
Global salt-bearing basins develop extensively, and the formation of oil and gas reservoirs in basins is often related to a layer of cream salt (Jackson et al, 1996; rowan et al, 1999; gu Chengzao et al, 2003; gold jun et al, 2010). The paste salt layer occupies a small proportion in a basin-deposited rock system, but has good compactness, so that the paste salt layer is an important cover layer of a plurality of large and extra-large oil and gas fields and has important influence and control effects on oil and gas accumulation and preservation. In addition, the cream salt rock has plasticity, which causes deformation patterns of the formation of the basin stratum to change, and salt related formations of different properties and types are formed, so that the cream salt rock becomes an important structural trap type and a transportation and aggregation channel of the basin (Alsop et al, 1996).
In addition, the gypsum rock also has special thermophysical properties of high thermal conductivity and low heat generation rate. The actual measurement shows that the thermal conductivity of the gypsum salt rock is as high as 6W/(m K), which is 2-3 times that of the common sedimentary rock, and the heat generation rate is as low as 0.01-0.23 mu W/m 3 The strong difference in thermal properties between the cream salt rock and the surrounding rock tends to cause a change in basin thermal regime, which is 1/20 to 1/30 of that of the conventional sedimentary rock (Robertson, 1988;Clauser and Huenges,1995; nansheng et al 2004). The thermal conductivity of the paste salt layer is higher than that of the surrounding stratum, a rapid channel for heat flow is formed, the paste salt layer can cause the heat flow at the lower part and the periphery of the paste salt layer to rapidly flow to the salt layer due to low thermal resistance, the paste salt layer has a heat absorption function, the temperature of the underlying stratum is rapidly reduced, a chimney effect of an upper coating is formed, the temperature of the underlying stratum is relatively low, and the temperature of the saline stratum is relatively high (Zhuo et al, 2016; liu Shaowen and the like, 2017).
The chemical reaction rate in the process of converting the dispersed organic matters contained in the hydrocarbon source rock into organic hydrocarbons is in an exponential relationship with temperature, but only in a linear relationship with time, so that the thermal evolution of the organic matters is mainly controlled by the temperature (Barker et al, 1986; wu Guangda, et al, 2006; cao Zhanpeng, et al, 2016). The unique thermophysical properties of the gypsum rock will then directly influence the thermal evolution process of the source rock. Hydrocarbon generation is the material basis of migration, aggregation and accumulation of oil and gas, and is a precondition for the existence of an oil and gas system (Ren et al 2020; zuo et al 2020), so that the influence effect of salt rock deposition on the thermal evolution of hydrocarbon source rock directly controls the aggregation, distribution and enrichment rules of the oil and gas, thereby influencing the further exploration and prediction work. Therefore, how to define the influence effect of salt rock deposition on the thermal evolution effect of the hydrocarbon source rock, and provide key parameters for evaluating and defining favorable exploration zones for oil and gas resources of salt-bearing deposition basins becomes a problem to be solved urgently by those skilled in the art.
Reference to the literature
[1]Jackson M P A,Roberts D G,Snelson S.Salt tectonics:A global persp ective[J].AAPG Mem,1996,65:454；
[2]Rowan M G,Jackson M P A,Trudgill B D.Salt-related fault families and fault welds in the northern Gulf of Mexico[J].AAPG Bull,1999,83:1454-1484；
[3] Gu Chengzao, zhao Wenzhi, wei Guoji, etc. salt construction and oil and gas exploration [ J ]. Oil exploration and development, 2003,30:17-19;
[4] jun of gold, zhou Yan, cloud gold, etc. the distribution of sea-phase stratum paste salt rock cover layer and recent oil and gas exploration direction [ J ]. Oil and gas geology, 2010,31:715-724;
[5]Alsop G I,Blundell D J,Davison I.Salt Tectonics[M].London:Special Issue of Geological Society,1996,100:310；
[6]Robertson E C.Thermal Properties of Rocks[M].USGS,84–441Open file Report.Reston:United States Geological Survey,1988.1-106；
[7]Clauser C,Huenges E.Thermal conductivity of rocks and minerals[M].In:Ahrens T J,ed.Rock Physics and Phase Relations-A Handbook of Physical Constants.AGU Reference Shelf Series 3.Washington DC:American Geophysic al Union,1995.105-126；
[8] nansheng, hu Shengbiao, he Lijuan theoretical and applied research on geothermal regime of basin [ M ]. Beijing: oil industry Press, 2004.34-36;
[9]Zhuo Q G,Meng F W,Zhao M J,et al.The salt chimney effect:delay of thermal evolution of deep hydrocarbon source rocks due to high thermal conductivity of evaporates[J].Geofluids,2016,16:440-451；
[10] liu Shaowen, yang Xiaoqiu, nansheng, etc. sedimentary basin salt formation thermal effects and their hydrocarbon geology significance [ J ]. Science bulletins, 2017,62:1631-1644;
[11]Barker C E,Pawlexicz M J.The correlation of vitrinite reflectance with maximum temperature in humic or ganic matter in G.Buntebarth and L.stegena,eds,paleogeothermics[J].Lecture notes in earth sciences,New York:Springer-Verleg,1986,5:79-228；
[12] wu Guangda, ge Xiaohong, liu Yongjiang, etc. in the firewood basin, new generation structural evolution and control of oil and gas [ J ]. World geology, 2006, (04): 411-417;
[13] cao Zhanpeng, armillariella, xiong Ping, et al, erdos basin, north mountain southwest Ornithogel Heat evolution recovery and Hydrocarbon production history-geological report by example [ J ]. In the Linnata-Xunyi area, 2016,90 (03): 513-520;
[14]Ren Z L,Cui J P,Qi K,et al.Control effects of temperature and thermal evolution history of deep and ultra-deep layers on hydrocarbon phase state and hydrocarbon generation history[J].Natural Gas Industry B,2020,7(prepublish)；
[15]Zuo Y H,Yang M H,Hao Q Q,et al.New Progress on Hydrocarb on-generation History of the Dongpu Depression in the Bohai Bay Basin based on Thermal History and Hydrocarbon Generation Kinetics[J].Acta Geologica Sinica-English Edition,2020,94(5)。
disclosure of Invention
Aiming at the defects of the prior art, the invention provides a method and a system for evaluating the effect of rock salt deposition on the thermal evolution influence of hydrocarbon source rock under salt. And quantitatively calculating the temperature of the top surface of the hydrocarbon source rock under salt when the thickness of the salt rock deposit is different by utilizing a one-dimensional steady-state heat conduction equation and the thermal physical properties of the stratum above salt, the salt rock and the stratum under salt so as to determine the influence effect of the salt rock deposit on the thermal evolution of the hydrocarbon source rock under salt.
In order to achieve the above object, the present invention adopts the following technical scheme:
a method for evaluating the effect of salt rock deposition on the thermal evolution of a hydrocarbon source rock under salt, comprising the steps of:
the first step: calculating the salt rock deposition thickness Z by utilizing one-dimensional steady-state heat conduction equation 5 Temperature T of top surface of hydrocarbon source rock under salt 1 ；
And a second step of: establishing a linear relation between the temperature and the depth data of a basin typical well; establishing a logarithmic relation between the maturity Ro' of the typical well and the depth data; obtaining an exponential relation between the maturity Ro' and the temperature by using the two relation; according to the corresponding relation between the maturity Ro' and the temperature, calculating the formation temperature as T 1 At hydrocarbon source rock maturity R o ；
And a third step of: calculating the increase or decrease of the thickness of the salt deposit to Z by utilizing a one-dimensional steady-state heat conduction equation 5 ' Top temperature of hydrocarbon Source under salt T 1 ' and maturity of R O ’；
Fourth step: calculating the temperature increase or decrease amount DeltaT and the maturity increase or decrease amount DeltaR of the hydrocarbon source rock top surface o ；
Fifth step: calculating the temperature increase or decrease rate theta T and the maturity increase or decrease rate theta R according to the temperature of the top surface of the hydrocarbon source rock and the maturity increase or decrease amount respectively o ；
Sixth step: inputting the data obtained in the first to fifth steps into a geological information system or other drawing software.
Seventh step: establishing an analysis model: and establishing a mathematical model to simulate the distribution characteristics of the temperature reduction of the top surface of the hydrocarbon source rock under salt by using the input data.
Eighth step: and calculating the numerical distribution of the temperature reduction of the top surface of the hydrocarbon source rock under salt.
Ninth step: drawing a plane distribution diagram: and drawing a plane distribution characteristic diagram of the temperature reduction of the top surface of the hydrocarbon source rock under salt according to the calculated temperature reduction data by using a Geological Information System (GIS) or other professional drawing software.
Further, in the first step, the salt deposit thickness Z is calculated by using a one-dimensional steady-state heat conduction equation 5 Temperature T of top surface of hydrocarbon source rock under salt 1 The method is characterized by comprising the following steps:
T 1 ＝T 0 +q 1 Z 1 /K 1 -A 1 Z 1 2 /(2K 1 )+q 2 Z 2 /K 2 -A 2 Z 2 2 /(2K 2 )+q 3 Z 3 /K 3 -A 3 Z 3 2 /(2K 3 )+q 4 Z 4 /K 4 -A 4 Z 4 2 /(2K 4 )+q 5 Z 5 /K 5 -A 5 Z 5 2 /(2K 5 )+q 6 Z 6 /K 6 -A 6 Z 6 2 /(2K 6 ) (1-1)
q 2 ＝q 1 -A 1 Z 1 (1-2)
q 3 ＝q 2 -A 2 Z 2 (1-3)
q 4 ＝q 3 -A 3 Z 3 (1-4)
q 5 ＝q 4 -A 4 Z 4 (1-5)
q 6 ＝q 5 -A 5 Z 5 (1-6)
Z＝Z 1 +Z 2 +Z 3 +Z 4 +Z 5 +Z 6 (1-7)
wherein T is 0 Is the surface temperature, DEG C; t (T) 1 Is the temperature of the top surface (depth Z) of the hydrocarbon source rock, DEG C; z is the thickness of the hydrocarbon source rock overburden layer, m; q 1 Is the surface heat flow, mW/m 2 ；q 2 Is the heat flow of the top surface of the stratum of group B, mW/m 2 ；q 3 Is the heat flow of the top surface of the stratum of group C, mW/m 2 ；q 4 For the heat flow of the top surface of the group D stratum, mW/m 2 ；q 5 For heat flow on top of group E formation (paste salt layer), mW/m 2 ；q 6 Is the heat flow of the top surface of the F group stratum, mW/m 2 ；K 1 W/(m.K) is the heat conductivity of the stratum of group A; a is that 1 For the heat generation rate of the stratum of group A, mu W/m 3 ；Z 1 The thickness of the stratum of group A, m; k (K) 2 W/(m.K) is the thermal conductivity of the stratum of group B; a is that 2 Heat generation rate of group B stratum, mu W/m 3 ；Z 2 The thickness of the stratum of group B, m; k (K) 3 W/(m.K) is the thermal conductivity of the stratum of group C; a is that 3 Heat generation rate of C group stratum, mu W/m 3 ；Z 3 The thickness of the stratum of group C, m; k (K) 4 W/(m.K) is the thermal conductivity of the group D stratum; a is that 4 For generating heat rate of D group stratum, mu W/m 3 ；Z 4 The thickness of the stratum of group D, m; k (K) 5 The thermal conductivity of the stratum (paste salt layer) of the group E is W/(m.K); a is that 5 For generating heat rate of E group stratum (paste salt layer), mu W/m 3 ；Z 5 The thickness of the stratum (paste salt layer) of the group E is m; k (K) 6 W/(m.K) is the F group formation heat conductivity; a is that 6 For F group formation heat generation rate, mu W/m 3 ；Z 6 And the formation thickness of group F, m.
Further, in the second step shown, a linear relationship (2-1) is established using the temperature and depth data of a basin representative well; establishing a logarithmic relation (2-2) by using the maturity Ro' of the typical well and the depth data; obtaining an exponential relation (2-3) between the maturity Ro' and the temperature by using the formula (2-1) and the formula (2-2); according to the corresponding relation between the maturity Ro' and the temperature, calculating the formation temperature as T 1 At hydrocarbon source rock maturity R o As shown in the formula (2-4);
Z 0 ＝41.876T-529.38 (2-1)
Z 0 ＝3217.8Ln(Ro”)+4973.4 (2-2)
R o ”＝0.1809e 0.0130T (2-3)
R o ＝0.1809e 0.0130T1 (2-4)
wherein Z is 0 Is the formation depth, m; t is the formation temperature, DEG C; r is R o For a formation temperature of T 1 Source rock at the timeMaturity,%.
Further, in the third step, the increase or decrease of the salt deposit thickness to Z is calculated by using a one-dimensional steady-state heat conduction equation 5 ' under salt hydrocarbon source rock top temperature T 1 ' and maturity of R O ' specifically, the following are:
T 1 ’＝T 0 +q 1 Z 1 /K 1 -A 1 Z 1 2 /(2K 1 )+q 2 Z 2 /K 2 -A 2 Z 2 2 /(2K 2 )+q 3 Z 3 /K 3 -A 3 Z 3 2 /(2K 3 )+q 4 Z 4 /K 4 -A 4 Z 4 2 /(2K 4 )+q 5 Z 5 ’/K 5 -A 5 Z 5 ’ 2 /(2K 5 )+q 6 ’Z 6 ’/K 6 -A 6 Z 6 ’ 2 /(2K 6 ) (3-1)
q 6 ’＝q 5 -A 5 Z 5 ’ (3-2)
Z＝Z 1 +Z 2 +Z 3 +Z 4 +Z 5 ’+Z 6 ’ (3-3)
R o ’＝0.1809e 0.0130T1’ (3-4)
wherein T is 1 ' is the temperature of the top surface of the hydrocarbon source rock, DEG C; r is R o ' is the maturity of the top surface of the hydrocarbon source rock,%; q 6 ' Heat flow at the top of group F formation, mW/m 2 ；Z 5 ' is the thickness of the stratum (salt layer) of group E, m; z is Z 6 ' is the formation thickness of group F, m.
Further, in the fourth step, the temperature increase or decrease amount Δt and the maturity increase or decrease amount Δr of the hydrocarbon source rock face are calculated o The method comprises the steps of carrying out a first treatment on the surface of the The formula is as follows:
ΔT＝q 5 (Z 5 ’-Z 5 )/K 5 -A 5 (Z 5 ’ 2 -Z 5 2 )/(2K 5 )+(q 5 Z 6 ’-A 5 Z 5 ’Z 6 ’-q 6 Z 6 )/K 6 -A 6 (Z 6 ’ 2 -Z 6 2 )/(2K 6 )(4-1)
ΔR o ＝R o -R o ’＝0.1809(e 0.0130T1’ -e 0.0130T1 ) (4-2)
wherein, delta T is the temperature increasing or decreasing amount and DEG C; deltaR o In% for the amount of increase (decrease) in maturity.
Further, in the fifth step, a temperature increase or decrease rate θT and a maturity increase or decrease rate θR are calculated based on the hydrocarbon source rock face temperature and the maturity increase or decrease amount, respectively o ；
θT＝ΔT/T 1 ＝[q 5 (Z 5 ’-Z 5 )/K 5 -A 5 (Z 5 ’ 2 -Z 5 2 )/(2K 5 )+(q 5 Z 6 ’-A 5 Z 5 ’Z 6 ’-q 6 Z 6 )/K 6 -A 6 (Z 6 ’ 2 -Z 6 2 )/(2K 6 )]/[T 0 +q 1 Z 1 /K 1 -A 1 Z 1 2 /(2K 1 )+q 2 Z 2 /K 2 -A 2 Z 2 2 /(2K 2 )+q 3 Z 3 /K 3 -A 3 Z 3 2 /(2K 3 )+q 4 Z 4 /K 4 -A 4 Z 4 2 /(2K 4 )+q 5 Z 5 /K 5 -A 5 Z 5 2 /(2K 5 )+q 6 Z 6 /K 6 -A 6 Z 6 2 /(2K 6 )] (5-1)
θR o ＝ΔR o /R o ＝(e 0.0130T1’ -e 0.0130T1 )/e 0.0130T1 ＝e 0.0130(T1’-T1) -1 (5-2)
Wherein θT is the rate of increase or decrease in temperature; θR o Is the rate of increase or decrease in maturity.
The invention discloses a system for evaluating the influence of salt rock deposition on the thermal evolution of a hydrocarbon source rock under salt, which can be used for implementing the method for evaluating the influence of salt rock deposition on the thermal evolution of the hydrocarbon source rock under salt, and concretely comprises the following steps:
and a rock salt deposition thickness calculation module: and calculating the influence of the salt rock deposition thickness on the temperature of the top surface of the hydrocarbon source rock under salt by using a one-dimensional steady-state heat conduction equation.
Maturity calculation module: and establishing a linear relation between the temperature and the depth data of the basin typical well, establishing a logarithmic relation between the maturity and the depth data, solving an exponential relation between the maturity and the temperature, and calculating the maturity of the hydrocarbon source rock.
Temperature and maturity change module: and calculating the influence of the change of the thickness of the salt rock deposit on the temperature and the maturity of the top surface of the hydrocarbon source rock by using a one-dimensional steady-state heat conduction equation, and calculating the increase and decrease amount and the change rate of the temperature and the maturity.
A geological information system input module: the calculated data is input into a geological information system so as to carry out subsequent analysis and visualization processing.
The analysis model building module: and establishing a mathematical model, simulating the distribution characteristics of the temperature change of the top surface of the hydrocarbon source rock under salt, and calculating the numerical distribution of the temperature change.
Visual display module: and drawing a plane distribution characteristic diagram of temperature change of the top surface of the hydrocarbon source rock under salt by using a geological information system, and intuitively showing the distribution condition of the temperature change.
The invention also discloses a computer device, which comprises a memory, a processor and a computer program stored on the memory and capable of running on the processor, wherein the processor realizes the method for evaluating the influence of the salt rock deposition on the thermal evolution of the hydrocarbon source rock under salt when executing the program.
The invention also discloses a computer readable storage medium, on which a computer program is stored, which when being executed by a processor implements the method for evaluating the influence of salt rock deposition on thermal evolution of a hydrocarbon source rock under salt.
Compared with the prior art, the invention has the advantages that:
the temperature of the top surface of the hydrocarbon source rock under salt when the thickness of the salt rock deposit is different is quantitatively calculated by utilizing a one-dimensional steady-state heat conduction equation and the thermal physical properties (heat conductivity and heat generation rate) of the stratum on the salt, the salt rock and the stratum under salt, the influence effect of the salt rock deposit on the thermal evolution of the hydrocarbon source rock under salt is clear, the reliability of the result is improved, and a basis is provided for further researching the maturity and hydrocarbon generation history of the hydrocarbon source rock under salt. And quantitatively characterizing the change characteristics of the temperature of the top surface of the hydrocarbon source rock under the salt along with the change of the thickness of the salt deposit in the sedimentary basin with uneven distribution of the thickness of the salt deposit.
Through the geological information system and drawing software, the calculated data can be visually displayed, and the distribution condition of temperature and maturity change can be intuitively displayed, so that the method is convenient for people to understand and analyze.
The systematic modularized structure is convenient for data processing and analysis, can improve efficiency and reduce the complexity of manual operation.
Drawings
FIG. 1 is a flow chart of a technical route of a method for quantitatively evaluating the effect of rock salt deposition on thermal evolution of a hydrocarbon source rock under salt according to the embodiment of the invention.
FIG. 2 is a schematic representation of the thickness of a salt deposit (group E formation) and the top temperature and maturity of a source rock according to an embodiment of the present invention; (a) For salt deposit (group E formation) thickness Z 5 (b) a thickness Z for salt deposit (group E formation) 5 ’。
FIG. 3 is a planar distribution diagram of salt thickness for a deep water hydrocarbon bearing basin (SS basin) for extensive development of a salt rock overseas in accordance with an embodiment of the present invention.
FIG. 4 is a graph showing the effect plane of salt deposit on the temperature of the top surface of a hydrocarbon source rock under the salt of an SS basin, in accordance with an embodiment of the present invention.
Detailed Description
The invention will be described in further detail below with reference to the accompanying drawings and by way of examples in order to make the objects, technical solutions and advantages of the invention more apparent.
As shown in fig. 1, the invention provides a method for quantitatively evaluating the effect of rock salt deposition on thermal evolution of a hydrocarbon source rock under salt, which is successfully applied to a sea basin with extensive development of a certain overseas rock salt, and comprises the following calculation steps:
the first step: calculating the thickness Z of the salt deposit (E group stratum) by utilizing a one-dimensional steady-state heat conduction equation 5 Temperature T of top surface of hydrocarbon source rock under salt 1 ；
T 1 ＝T 0 +q 1 Z 1 /K 1 -A 1 Z 1 2 /(2K 1 )+q 2 Z 2 /K 2 -A 2 Z 2 2 /(2K 2 )+q 3 Z 3 /K 3 -A 3 Z 3 2 /(2K 3 )+q 4 Z 4 /K 4 -A 4 Z 4 2 /(2K 4 )+q 5 Z 5 /K 5 -A 5 Z 5 2 /(2K 5 )+q 6 Z 6 /K 6 -A 6 Z 6 2 /(2K 6 ) (1-1)
q 2 ＝q 1 -A 1 Z 1 (1-2)
q 3 ＝q 2 -A 2 Z 2 (1-3)
q 4 ＝q 3 -A 3 Z 3 (1-4)
q 5 ＝q 4 -A 4 Z 4 (1-5)
q 6 ＝q 5 -A 5 Z 5 (1-6)
Z＝Z 1 +Z 2 +Z 3 +Z 4 +Z 5 +Z 6 (1-7)
Wherein T is 0 Is the surface temperature, DEG C; t (T) 1 Is the temperature of the top surface (depth Z) of the hydrocarbon source rock, DEG C; z is the thickness of the hydrocarbon source rock overburden layer, m; q 1 Is the surface heat flow, mW/m 2 ；q 2 Is the heat flow of the top surface of the stratum of group B, mW/m 2 ；q 3 Is the heat flow of the top surface of the stratum of group C, mW/m 2 ；q 4 For the heat flow of the top surface of the group D stratum, mW/m 2 ；q 5 For heat flow on top of group E formation (paste salt layer), mW/m 2 ；q 6 Is the heat flow of the top surface of the F group stratum, mW/m 2 ；K 1 Is group AFormation thermal conductivity, W/(mK); a is that 1 For the heat generation rate of the stratum of group A, mu W/m 3 ；Z 1 The thickness of the stratum of group A, m; k (K) 2 W/(m.K) is the thermal conductivity of the stratum of group B; a is that 2 Heat generation rate of group B stratum, mu W/m 3 ；Z 2 The thickness of the stratum of group B, m; k (K) 3 W/(m.K) is the thermal conductivity of the stratum of group C; a is that 3 Heat generation rate of C group stratum, mu W/m 3 ；Z 3 The thickness of the stratum of group C, m; k (K) 4 W/(m.K) is the thermal conductivity of the group D stratum; a is that 4 For generating heat rate of D group stratum, mu W/m 3 ；Z 4 The thickness of the stratum of group D, m; k (K) 5 The thermal conductivity of the stratum (paste salt layer) of the group E is W/(m.K); a is that 5 For generating heat rate of E group stratum (paste salt layer), mu W/m 3 ；Z 5 The thickness of the stratum (paste salt layer) of the group E is m; k (K) 6 W/(m.K) is the F group formation heat conductivity; a is that 6 For F group formation heat generation rate, mu W/m 3 ；Z 6 And the formation thickness of group F, m.
The values here are:
T 0 ＝2℃；Z＝5123m；q 1 ＝65mW/m 2 ；K 1 ＝1.49W/(m·K)；A 1 ＝0.95μW/m 3 ；Z 1 ＝147m；q 2 ＝64.86mW/m 2 ；K 2 ＝1.28W/(m·K)；A 2 ＝1.26μW/m 3 ；Z 2 ＝566m；q 3 ＝64.15mW/m 2 ；K 3 ＝1.62W/(m·K)；A 3 ＝1.37μW/m 3 ；Z 3 ＝1032m；q 4 ＝62.73mW/m 2 ；K 4 ＝2.17W/(m·K)；A 4 ＝1.15μW/m 3 ；Z 4 ＝1029m；q 5 ＝61.55mW/m 2 ；K 5 ＝5.40W/(m·K)；A 5 ＝0.22μW/m 3 ；Z 5 ＝1715m；q 6 ＝61.17mW/m 2 ；K 6 ＝2.85W/(m·K)；A 6 ＝0.64μW/m 3 ；Z 6 ＝634m；
and (3) calculating to obtain:
T 1 ＝139.86℃。
and a second step of: taking the Mortols basin as an example, the temperature and depth number of a typical well are first utilizedEstablishing a linear relation (formula 2-1) between the two; establishing a logarithmic relationship (equation 2-2) of the maturity (Ro ") of a typical well and depth data; obtaining an exponential relation (formula 2-3) of the maturity (Ro ") and the temperature by using the two relation; calculating the formation temperature as T according to the corresponding relation between the maturity (Ro') and the temperature 1 At hydrocarbon source rock maturity R o (formulae 2 to 4);
Z 0 ＝41.876T-529.38 (2-1)
Z 0 ＝3217.8Ln(Ro”)+4973.4 (2-2)
R o ”＝0.1809e 0.0130T (2-3)
R o ＝0.1809e 0.0130T1 (2-4)
wherein Z is 0 Is the formation depth, m; t is the formation temperature, DEG C; r is R o For a formation temperature of T 1 The maturity of the hydrocarbon source rock is%.
The values here are:
R o ＝1.11％。
and a third step of: calculating the thickness increase (decrease) of the salt deposit (E group stratum) to Z by using a one-dimensional steady-state heat conduction equation 5 ' Top temperature of hydrocarbon Source under salt T 1 ' and maturity of R O ’；
T 1 ’＝T 0 +q 1 Z 1 /K 1 -A 1 Z 1 2 /(2K 1 )+q 2 Z 2 /K 2 -A 2 Z 2 2 /(2K 2 )+q 3 Z 3 /K 3 -A 3 Z 3 2 /(2K 3 )+q 4 Z 4 /K 4 -A 4 Z 4 2 /(2K 4 )+q 5 Z 5 ’/K 5 -A 5 Z 5 ’ 2 /(2K 5 )+q 6 ’Z 6 ’/K 6 -A 6 Z 6 ’ 2 /(2K 6 ) (3-1)
q 6 ’＝q 5 -A 5 Z 5 ’ (3-2)
Z＝Z 1 +Z 2 +Z 3 +Z 4 +Z 5 ’+Z 6 ’ (3-3)
R o ’＝0.1809e 0.0130T1’ (3-4)
Wherein T is 1 ' is the temperature of the top surface (depth Z) of the source rock, DEG C; r is R o ' is the maturity of the top surface (depth Z) of the source rock,%; q 6 ' Heat flow at the top of group F formation, mW/m 2 ；Z 5 ' is the thickness of the stratum (salt layer) of group E, m; z is Z 6 ' is the formation thickness of group F, m.
The values here are:
T 0 ＝2℃；Z＝5123m；q 1 ＝65mW/m 2 ；K 1 ＝1.49W/(m·K)；A 1 ＝0.95μW/m 3 ；Z 1 ＝147m；q 2 ＝64.86mW/m 2 ；K 2 ＝1.28W/(m·K)；A 2 ＝1.26μW/m 3 ；Z 2 ＝566m；q 3 ＝64.15mW/m 2 ；K 3 ＝1.62W/(m·K)；A 3 ＝1.37μW/m 3 ；Z 3 ＝1032m；q 4 ＝62.73mW/m 2 ；K 4 ＝2.17W/(m·K)；A 4 ＝1.15μW/m 3 ；Z 4 ＝1029m；q 5 ＝61.55mW/m 2 ；K 5 ＝5.40W/(m·K)；A 5 ＝0.22μW/m 3 ；Z 5 ’＝715m；q 6 ’＝61.39mW/m 2 ；K 6 ＝2.85W/(m·K)；A 6 ＝0.64μW/m 3 ；Z 6 ’＝1634m；
and (3) calculating to obtain:
T 1 ’＝149.85℃；R o ’＝1.27％。
fourth step: calculating the temperature increase (decrease) amount DeltaT and the maturity increase (decrease) amount DeltaR of the hydrocarbon source rock top surface o ；
ΔT＝q 5 (Z 5 ’-Z 5 )/K 5 -A 5 (Z 5 ’ 2 -Z 5 2 )/(2K 5 )+(q 5 Z 6 ’-A 5 Z 5 ’Z 6 ’-q 6 Z 6 )/K 6 -A 6 (Z 6 ’ 2 -Z 6 2 )/(2K 6 )(4-1)
ΔR o ＝R o -R o ’＝0.1809(e 0.0130T1’ -e 0.0130T1 ) (4-2)
Wherein DeltaT is the temperature increasing (decreasing) amount, DEG C; deltaR o In% for the amount of increase (decrease) in maturity.
The calculation result here is:
ΔT＝9.99℃；ΔR o ＝0.16％。
fifth step: calculating the temperature increase (decrease) rate thetat and the maturity increase (decrease) rate thetar according to the temperature of the top surface of the hydrocarbon source rock and the maturity increase (decrease) amount respectively o ；
θT＝ΔT/T 1 ＝[q 5 (Z 5 ’-Z 5 )/K 5 -A 5 (Z 5 ’ 2 -Z 5 2 )/(2K 5 )+(q 5 Z 6 ’-A 5 Z 5 ’Z 6 ’-q 6 Z 6 )/K 6 -A 6 (Z 6 ’ 2 -Z 6 2 )/(2K 6 )]/[T 0 +q 1 Z 1 /K 1 -A 1 Z 1 2 /(2K 1 )+q 2 Z 2 /K 2 -A 2 Z 2 2 /(2K 2 )+q 3 Z 3 /K 3 -A 3 Z 3 2 /(2K 3 )+q 4 Z 4 /K 4 -A 4 Z 4 2 /(2K 4 )+q 5 Z 5 /K 5 -A 5 Z 5 2 /(2K 5 )+q 6 Z 6 /K 6 -A 6 Z 6 2 /(2K 6 )] (5-1)
θR o ＝ΔR o /R o ＝(e 0.0130T1’ -e 0.0130T1 )/e 0.0130T1 ＝e 0.0130(T1’-T1) -1 (5-2)
Wherein θT is the rate of temperature increase (decrease); θR o To increase (decrease) the maturity。
The calculation result here is:
θT＝7.14％；θR o ＝14.41％。
sixth step: inputting the data obtained in the first to fifth steps into a geological information system or other drawing software.
Seventh step: establishing an analysis model: and establishing a mathematical model to simulate the distribution characteristics of the temperature reduction of the top surface of the hydrocarbon source rock under salt by using the input data. Mathematical modeling software, such as MATLAB, python, etc., may be used for model creation and data processing.
Eighth step: and calculating the numerical distribution of the temperature reduction of the top surface of the hydrocarbon source rock under salt.
Ninth step: drawing a plane distribution diagram: and drawing a plane distribution characteristic diagram of the temperature reduction of the top surface of the hydrocarbon source rock under salt according to the calculated temperature reduction data by using a Geological Information System (GIS) or other professional drawing software. The proper chart type and color rendering mode can be selected according to actual requirements, and the distribution condition of the temperature reduction can be intuitively displayed.
As shown in fig. 2, the effect of cooling down the salt deposit affects the top temperature and maturity of the sub-salt source rock; FIG. 2 (a) shows a salt deposit (group E formation) of thickness Z 5 FIG. 2 (b) shows a salt deposit (group E formation) thickness Z 5 '. And a theoretical model diagram of influence effect of salt rock deposition on thermal evolution of the hydrocarbon source rock is shown, and related calculation parameters which need to be selected during calculation by utilizing a one-dimensional steady-state heat conduction equation are used for description.
In fig. 2: t (T) 0 Is the surface temperature, DEG C; t (T) 1 Is the temperature of the top surface (depth Z) of the hydrocarbon source rock, DEG C; z is the thickness of the hydrocarbon source rock overburden layer, m; q 1 Is the surface heat flow, mW/m 2 ；q 2 Is the heat flow of the top surface of the stratum of group B, mW/m 2 ；q 3 Is the heat flow of the top surface of the stratum of group C, mW/m 2 ；q 4 For the heat flow of the top surface of the group D stratum, mW/m 2 ；q 5 For heat flow on top of group E formation (paste salt layer), mW/m 2 ；q 6 Is the heat flow of the top surface of the F group stratum, mW/m 2 ；K 1 W/(m.K) is the heat conductivity of the stratum of group A; a is that 1 For the heat generation rate of the stratum of group A, mu W/m 3 ；Z 1 The thickness of the stratum of group A, m; k (K) 2 W/(m.K) is the thermal conductivity of the stratum of group B; a is that 2 Heat generation rate of group B stratum, mu W/m 3 ；Z 2 The thickness of the stratum of group B, m; k (K) 3 W/(m.K) is the thermal conductivity of the stratum of group C; a is that 3 Heat generation rate of C group stratum, mu W/m 3 ；Z 3 The thickness of the stratum of group C, m; k (K) 4 W/(m.K) is the thermal conductivity of the group D stratum; a is that 4 For generating heat rate of D group stratum, mu W/m 3 ；Z 4 The thickness of the stratum of group D, m; k (K) 5 The thermal conductivity of the stratum (paste salt layer) of the group E is W/(m.K); a is that 5 For generating heat rate of E group stratum (paste salt layer), mu W/m 3 ；Z 5 The thickness of the stratum (paste salt layer) of the group E is m; k (K) 6 W/(m.K) is the F group formation heat conductivity; a is that 6 For F group formation heat generation rate, mu W/m 3 ；Z 6 The thickness of the stratum of group F, m; t (T) 1 ' is the temperature of the top surface (depth Z) of the source rock, DEG C; r is R o ' is the maturity of the top surface (depth Z) of the source rock,%; q 6 ' Heat flow at the top of group F formation, mW/m 2 ；Z 5 ' is the thickness of the stratum (salt layer) of group E, m; z is Z 6 ' is the formation thickness of group F, m.
The method utilizes a one-dimensional steady-state heat conduction equation and thermal physical properties (heat conductivity and heat generation rate) of the formation on the salt, the salt rock and the formation under the salt to quantitatively calculate the temperature of the top surface of the hydrocarbon source rock under the salt when the thickness of the salt rock deposit is different, so that the influence effect of the salt rock deposit on the thermal evolution of the hydrocarbon source rock under the salt is clear, and a basic basis is provided for further researching the maturity and hydrocarbon generation history of the hydrocarbon source rock under the salt. The E group stratum of the SS basin deposits a set of huge thick salt rocks, but the thickness plane distribution of the salt rocks in the basin is extremely uneven (figure 3), and the plane distribution characteristics of the temperature reduction amount of the top surface of the hydrocarbon source rocks under the influence of the salt rocks of the SS basin are analyzed by utilizing a one-dimensional steady-state heat conduction equation according to the calculation method of the invention (figure 4).
In still another embodiment of the present invention, a system for evaluating the impact of salt rock deposition on thermal evolution of a source rock under salt is provided, where the system can be used to implement the method for evaluating the impact of salt rock deposition on thermal evolution of a source rock under salt, and specifically includes:
and a rock salt deposition thickness calculation module: and calculating the influence of the salt rock deposition thickness on the temperature of the top surface of the hydrocarbon source rock under salt by using a one-dimensional steady-state heat conduction equation.
Maturity calculation module: and establishing a linear relation between the temperature and the depth data of the basin typical well, establishing a logarithmic relation between the maturity and the depth data, solving an exponential relation between the maturity and the temperature, and calculating the maturity of the hydrocarbon source rock.
Temperature and maturity change module: and calculating the influence of the change of the thickness of the salt rock deposit on the temperature and the maturity of the top surface of the hydrocarbon source rock by using a one-dimensional steady-state heat conduction equation, and calculating the increase and decrease amount and the change rate of the temperature and the maturity.
A geological information system input module: the calculated data is input into a geological information system or other drawing software for subsequent analysis and visualization processing.
The analysis model building module: and establishing a mathematical model, simulating the distribution characteristics of the temperature change of the top surface of the hydrocarbon source rock under salt, and calculating the numerical distribution of the temperature change.
Visual display module: and drawing a plane distribution characteristic diagram of the temperature change of the top surface of the hydrocarbon source rock under salt by using a geological information system or other drawing software, and intuitively showing the distribution condition of the temperature change.
In yet another embodiment of the present invention, a terminal device is provided, the terminal device including a processor and a memory, the memory for storing a computer program, the computer program including program instructions, the processor for executing the program instructions stored by the computer storage medium. The processor may be a central processing unit (Central Processing Unit, CPU), but may also be other general purpose processors, digital signal processors (Digital Signal Processor, DSP), application specific integrated circuits (Application Specific Integrated Circuit, ASIC), off-the-shelf Programmable gate arrays (FPGAs) or other Programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, etc., which are the computational core and control core of the terminal adapted to implement one or more instructions, in particular adapted to load and execute one or more instructions to implement a corresponding method flow or a corresponding function; the processor provided by the embodiment of the invention can be used for evaluating the operation of the method for influencing the thermal evolution of the hydrocarbon source rock under salt by salt rock deposition.
In a further embodiment of the present invention, the present invention also provides a storage medium, in particular, a computer readable storage medium (Memory), which is a Memory device in a terminal device, for storing programs and data. It will be appreciated that the computer readable storage medium herein may include both a built-in storage medium in the terminal device and an extended storage medium supported by the terminal device. The computer-readable storage medium provides a storage space storing an operating system of the terminal. Also stored in the memory space are one or more instructions, which may be one or more computer programs (including program code), adapted to be loaded and executed by the processor. The computer readable storage medium herein may be a high-speed RAM memory or a non-volatile memory (non-volatile memory), such as at least one magnetic disk memory.
One or more instructions stored in a computer-readable storage medium may be loaded and executed by a processor to implement the respective steps of the methods described in the above embodiments with respect to evaluating the impact of salt rock deposition on thermal evolution of a source rock under salt.
It will be appreciated by those skilled in the art that embodiments of the present invention may be provided as a method, system, or computer program product. Accordingly, the present invention may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, the present invention may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, and the like) having computer-usable program code embodied therein.
The present invention is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems) and computer program products according to embodiments of the invention. It will be understood that each flow and/or block of the flowchart illustrations and/or block diagrams, and combinations of flows and/or blocks in the flowchart illustrations and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
Those of ordinary skill in the art will appreciate that the embodiments described herein are intended to aid the reader in understanding the practice of the invention and that the scope of the invention is not limited to such specific statements and embodiments. Those of ordinary skill in the art can make various other specific modifications and combinations from the teachings of the present disclosure without departing from the spirit thereof, and such modifications and combinations remain within the scope of the present disclosure.
Claims (9)
1. A method for evaluating the effect of salt rock deposition on the thermal evolution of a hydrocarbon source rock under a salt, comprising the steps of:
the first step: calculating the salt rock deposition thickness Z by utilizing one-dimensional steady-state heat conduction equation 5 Temperature T of top surface of hydrocarbon source rock under salt 1 ；
And a second step of: establishing a linear relation between the temperature and the depth data of a basin typical well; establishing a logarithmic relation between the maturity Ro' of the typical well and the depth data; obtaining an exponential relation between the maturity Ro' and the temperature by using the two relation; according to the corresponding relation between the maturity Ro' and the temperature, calculating the formation temperature as T 1 At hydrocarbon source rock maturity R o ；
And a third step of: calculating the increase or decrease of the thickness of the salt deposit to Z by utilizing a one-dimensional steady-state heat conduction equation 5 ' Top temperature of hydrocarbon Source under salt T 1 ' and maturity of R O ’；
Fourth step: calculating the temperature increase or decrease amount DeltaT and the maturity increase or decrease amount DeltaR of the hydrocarbon source rock top surface o ；
Fifth step: calculating the temperature increase or decrease rate theta T and the maturity increase or decrease rate theta R according to the temperature of the top surface of the hydrocarbon source rock and the maturity increase or decrease amount respectively o ；
Sixth step: inputting the data obtained in the first to fifth steps into a geological information system or other drawing software;
seventh step: establishing an analysis model: utilizing the input data to establish a mathematical model to simulate the distribution characteristics of the temperature reduction of the top surface of the hydrocarbon source rock under salt;
eighth step: calculating the numerical distribution of the temperature reduction of the top surface of the hydrocarbon source rock under salt;
ninth step: drawing a plane distribution diagram: and drawing a plane distribution characteristic diagram of the temperature reduction of the top surface of the hydrocarbon source rock under salt according to the calculated temperature reduction data by using a geological information system or other professional drawing software.
2. A method of evaluating the effect of salt rock deposition on the thermal evolution of a source rock under salt according to claim 1, wherein: in the first step, the salt rock deposition is calculated by utilizing a one-dimensional steady-state heat conduction equationThickness Z 5 Temperature T of top surface of hydrocarbon source rock under salt 1 The method is characterized by comprising the following steps:
T 1 ＝T 0 +q 1 Z 1 /K 1 -A 1 Z 1 2 /(2K 1 )+q 2 Z 2 /K 2 -A 2 Z 2 2 /(2K 2 )+q 3 Z 3 /K 3 -A 3 Z 3 2 /(2K 3 )+q 4 Z 4 /K 4 -A 4 Z 4 2 /(2K 4 )+q 5 Z 5 /K 5 -A 5 Z 5 2 /(2K 5 )+q 6 Z 6 /K 6 -A 6 Z 6 2 /(2K 6 ) (1-1)
q 2 ＝q 1 -A 1 Z 1 (1-2)
q 3 ＝q 2 -A 2 Z 2 (1-3)
q 4 ＝q 3 -A 3 Z 3 (1-4)
q 5 ＝q 4 -A 4 Z 4 (1-5)
q 6 ＝q 5 -A 5 Z 5 (1-6)
Z＝Z 1 +Z 2 +Z 3 +Z 4 +Z 5 +Z 6 (1-7)
wherein T is 0 Is the surface temperature, DEG C; t (T) 1 Is the temperature of the top surface (depth Z) of the hydrocarbon source rock, DEG C; z is the thickness of the hydrocarbon source rock overburden layer, m; q 1 Is the surface heat flow, mW/m 2 ；q 2 Is the heat flow of the top surface of the stratum of group B, mW/m 2 ；q 3 Is the heat flow of the top surface of the stratum of group C, mW/m 2 ；q 4 For the heat flow of the top surface of the group D stratum, mW/m 2 ；q 5 For heat flow on top of group E formation (paste salt layer), mW/m 2 ；q 6 Is the heat flow of the top surface of the F group stratum, mW/m 2 ；K 1 W/(m.K) is the heat conductivity of the stratum of group A; a is that 1 For the heat generation rate of the stratum of group A, mu W/m 3 ；Z 1 The thickness of the stratum of group A, m; k (K) 2 W/(m.K) is the thermal conductivity of the stratum of group B; a is that 2 Heat generation rate of group B stratum, mu W/m 3 ；Z 2 The thickness of the stratum of group B, m; k (K) 3 W/(m.K) is the thermal conductivity of the stratum of group C; a is that 3 Heat generation rate of C group stratum, mu W/m 3 ；Z 3 The thickness of the stratum of group C, m; k (K) 4 W/(m.K) is the thermal conductivity of the group D stratum; a is that 4 For generating heat rate of D group stratum, mu W/m 3 ；Z 4 The thickness of the stratum of group D, m; k (K) 5 The thermal conductivity of the stratum (paste salt layer) of the group E is W/(m.K); a is that 5 For generating heat rate of E group stratum (paste salt layer), mu W/m 3 ；Z 5 The thickness of the stratum (paste salt layer) of the group E is m; k (K) 6 W/(m.K) is the F group formation heat conductivity; a is that 6 For F group formation heat generation rate, mu W/m 3 ；Z 6 And the formation thickness of group F, m.
3. A method of evaluating the effect of salt rock deposition on the thermal evolution of a source rock under salt according to claim 2, wherein: in the second step, a linear relation (2-1) is established by using the temperature and depth data of the basin typical well; establishing a logarithmic relation (2-2) by using the maturity Ro' of the typical well and the depth data; obtaining an exponential relation (2-3) between the maturity Ro' and the temperature by using the formula (2-1) and the formula (2-2); according to the corresponding relation between the maturity Ro' and the temperature, calculating the formation temperature as T 1 At hydrocarbon source rock maturity R o As shown in the formula (2-4);
Z 0 ＝41.876T-529.38 (2-1)
Z 0 ＝3217.8Ln(Ro”)+4973.4 (2-2)
R o ”＝0.1809e 0.0130T (2-3)
R o ＝0.1809e 0.0130T1 (2-4)
wherein Z is 0 Is the formation depth, m; t is the formation temperature, DEG C; r is R o For a formation temperature of T 1 When (1)Maturity of hydrocarbon source rock,%.
4. A method of evaluating the effect of salt rock deposition on the thermal evolution of a source rock under salt according to claim 3, wherein: in the third step, the increase or decrease of the salt rock deposition thickness to Z is calculated by utilizing a one-dimensional steady-state heat conduction equation 5 ' under salt hydrocarbon source rock top temperature T 1 ' and maturity of R O ' specifically, the following are:
T 1 ’＝T 0 +q 1 Z 1 /K 1 -A 1 Z 1 2 /(2K 1 )+q 2 Z 2 /K 2 -A 2 Z 2 2 /(2K 2 )+q 3 Z 3 /K 3 -A 3 Z 3 2 /(2K 3 )+q 4 Z 4 /K 4 -A 4 Z 4 2 /(2K 4 )+q 5 Z 5 ’/K 5 -A 5 Z 5 ’ 2 /(2K 5 )+q 6 ’Z 6 ’/K 6 -A 6 Z 6 ’ 2 /(2K 6 ) (3-1)
q 6 ’＝q 5 -A 5 Z 5 ’ (3-2)
Z＝Z 1 +Z 2 +Z 3 +Z 4 +Z 5 ’+Z 6 ’ (3-3)
R o ’＝0.1809e 0.0130T1’ (3-4)
wherein T is 1 ' is the temperature of the top surface of the hydrocarbon source rock, DEG C; r is R o ' is the maturity of the top surface of the hydrocarbon source rock,%; q 6 ' Heat flow at the top of group F formation, mW/m 2 ；Z 5 ' is the thickness of the stratum (salt layer) of group E, m; z is Z 6 ' is the formation thickness of group F, m.
5. A method of evaluating the effect of salt rock deposition on the thermal evolution of a source rock under salt according to claim 4, wherein: in the fourth step, the meterCalculating the temperature increase or decrease delta T and the maturity increase or decrease delta R of the hydrocarbon source roof o The method comprises the steps of carrying out a first treatment on the surface of the The formula is as follows:
ΔT＝q 5 (Z 5 ’-Z 5 )/K 5 -A 5 (Z 5 ’ 2 -Z 5 2 )/(2K 5 )+(q 5 Z 6 ’-A 5 Z 5 ’Z 6 ’-q 6 Z 6 )/K 6 -A 6 (Z 6 ’ 2 -Z 6 2 )/(2K 6 ) (4-1)
ΔR o ＝R o -R o ’＝0.1809(e 0.0130T1’ -e 0.0130T1 ) (4-2)
wherein, delta T is the temperature increasing or decreasing amount and DEG C; deltaR o In% for the amount of increase (decrease) in maturity.
6. A method of evaluating the effect of salt rock deposition on the thermal evolution of a source rock under salt according to claim 5, wherein: in the fifth step, the temperature increase or decrease rate thetat and the maturity increase or decrease rate thetar are calculated according to the temperature of the top surface of the hydrocarbon source rock and the maturity increase or decrease amount respectively o ；
θT＝ΔT/T 1 ＝[q 5 (Z 5 ’-Z 5 )/K 5 -A 5 (Z 5 ’ 2 -Z 5 2 )/(2K 5 )+(q 5 Z 6 ’-A 5 Z 5 ’Z 6 ’-q 6 Z 6 )/K 6 -A 6 (Z 6 ’ 2 -Z 6 2 )/(2K 6 )]/[T 0 +q 1 Z 1 /K 1 -A 1 Z 1 2 /(2K 1 )+q 2 Z 2 /K 2 -A 2 Z 2 2 /(2K 2 )+q 3 Z 3 /K 3 -A 3 Z 3 2 /(2K 3 )+q 4 Z 4 /K 4 -A 4 Z 4 2 /(2K 4 )+q 5 Z 5 /K 5 -A 5 Z 5 2 /(2K 5 )+q 6 Z 6 /K 6 -A 6 Z 6 2 /(2K 6 )] (5-1)
θR o ＝ΔR o /R o ＝(e 0.0130T1’ -e 0.0130T1 )/e 0.0130T1 ＝e 0.0130(T1’-T1) -1 (5-2)
Wherein θT is the rate of increase or decrease in temperature; θR o Is the rate of increase or decrease in maturity.
7. A system for evaluating the impact of salt rock deposition on thermal evolution of a hydrocarbon source rock under salt, characterized by: the system can be used for implementing the method for evaluating the influence of salt rock deposition on the thermal evolution of a hydrocarbon source rock under salt according to one of claims 1 to 6, and specifically comprises the following steps:
and a rock salt deposition thickness calculation module: calculating the influence of the salt rock deposition thickness on the top surface temperature of the hydrocarbon source rock under salt by using a one-dimensional steady-state heat conduction equation;
maturity calculation module: establishing a linear relation between the temperature and the depth data of a basin typical well, establishing a logarithmic relation between the maturity and the depth data, solving an exponential relation between the maturity and the temperature, and calculating the maturity of the hydrocarbon source rock;
temperature and maturity change module: calculating the influence of the change of the salt rock deposition thickness on the temperature and the maturity of the top surface of the hydrocarbon source rock by using a one-dimensional steady-state heat conduction equation, and calculating the increase and decrease amount and the change rate of the temperature and the maturity;
a geological information system input module: inputting the calculated data into a geological information system so as to carry out subsequent analysis and visualization processing;
the analysis model building module: establishing a mathematical model, simulating the distribution characteristics of temperature change of the top surface of the hydrocarbon source rock under salt, and calculating the numerical distribution of the temperature change;
visual display module: and drawing a plane distribution characteristic diagram of temperature change of the top surface of the hydrocarbon source rock under salt by using a geological information system, and intuitively showing the distribution condition of the temperature change.
8. A computer device, characterized by: a computer program comprising a memory, a processor and a computer program stored on the memory and executable on the processor, said processor implementing the method of evaluating the impact of rock salt deposition on thermal evolution of a hydrocarbon source rock under salt according to one of claims 1 to 6 when said program is executed.
9. A computer-readable storage medium, characterized by: a computer program stored thereon, which when executed by a processor, implements a method of evaluating the impact of salt rock deposition on thermal evolution of a hydrocarbon source rock under salt according to one of claims 1 to 6.
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