CN103983536B - A kind of method utilizing logging trace to obtain shale gas air content - Google Patents
A kind of method utilizing logging trace to obtain shale gas air content Download PDFInfo
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- CN103983536B CN103983536B CN201410249240.5A CN201410249240A CN103983536B CN 103983536 B CN103983536 B CN 103983536B CN 201410249240 A CN201410249240 A CN 201410249240A CN 103983536 B CN103983536 B CN 103983536B
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Abstract
A kind of method utilizing logging trace to obtain shale gas air content of the present invention, relate to exploration geophysics field, refer more particularly to a kind of method utilizing logging trace to calculate shale gas air content on the basis of shale hydrocarbon-generating dynamics simulation test, methane adsorption isotherm experiment and resolution gas content measuring.The present invention for foundation with thermal simulation result etc., obtains shale gas and adds up conversion ratio, Gas-generating Potentiality and generation hydrocarbon gas total amount; Set up the calculated relationship between shale adsorptive power and TOC and calculate average air content; On-the-spot parsing is utilized to obtain air content and correct average air content; By resolving experiment gained shale gas air content and the linear regression of shale log data, obtain shale gas air content and interval transit time, the unary linear regression equation of resistivity and binary linear regression equation, realization utilizes logging trace to calculate shale air content, significantly improves counting yield and the accuracy of terrestrial facies shale gas air content.
Description
Technical field
The present invention relates to exploration geophysics field, refer more particularly to a kind of method utilizing logging trace to calculate shale gas air content on the basis of shale hydrocarbon-generating dynamics simulation test, methane adsorption isotherm experiment and resolution gas content measuring.
Background technology
Shale air content is the requisite capsule information of shale exploratory development, selection and appraisal of exploration area and reservoir study, is to calculate the important parameter that shale gas reserves formulate development plan.Because it exists in the self-contained unit of dark-coloured mud shale or high-carbon mud shale with multiple phase, therefore its evaluation method and development scheme are different from conventional gas and oil Tibetan.Along with improving constantly of shale gas exploratory development degree, the shale nonuniformity faced is high, geologic objective is complicated and sample test cost is more and more higher, and the method causing the past to carry out analysis purpose layer air content by resolving experiment is one by one difficult to meet the exploratory development needs of complex condition.Thus be necessary all kinds of geologic feature of means labor utilizing a kind of Cheap highly effective, also need supporting logging technology method and its attribute is extracted and reflects.
Summary of the invention
The logging trace that utilizes that the invention provides a kind of Cheap highly effective obtains the method for terrestrial facies shale gas air content.
Utilize logging trace to obtain a method for shale gas air content, comprise the steps:
Step 1: in the zone of interest of test shale gas field, take out n block core sample, every block is divided into three parts, measures by solution analyzer first part of shale samples and obtains logging trace and carry out scene resolving, tentatively obtain shale gas air content under simulated formation temperature conditions;
Step 2: carry out hydrocarbon-generating dynamics simulation test to second part of shale samples, utilize dynamics fitting software, is calculated as conversion ratio by the factor of created gase of hydrocarbon-generating dynamics simulated experiment result, record methane, C
2-C
5the potentiality of the raw hydrocarbon gas of the instantaneous conversion rate between 50 DEG C of warm rank peak hydrocarbon-generating stages, accumulation conversion ratio and sample; The accumulation utilizing known TOC value to calculate shale reality generates the amount of hydrocarbon gas;
Step 3: carry out adsorption isotherm experiment to the 3rd part of shale samples, obtains the main distribution range of maximum adsorption ability and the mean value of shale samples;
Step 4: the TOC value in integrating step 2 and the data of step 3 adsorption isotherm experiment, calculates shale adsorptive power;
Step 5: by step 2 and step 4 the data obtained, experiment gained shale gas air content data are resolved to step 1 and correct, by shale gas air content data and the linear regression of shale log data, obtain shale gas air content and interval transit time, the unary linear regression equation of resistivity and binary linear regression equation, and determine related coefficient;
Shale gas air content unary linear regression equation:
Cz
1=A* Δ t+B formula (1);
In formula, Cz
1for the shale gas air content calculated by unary linear regression equation, unit is m
3/ t; Δ t is interval transit time, and unit is μ s/m; Wherein, A, B are linear fit coefficient;
Shale gas air content binary linear regression equation:
Cz
2=A* Δ t-C*Rt+D formula (2);
In formula: Cz
2for the shale gas air content calculated by binary linear regression equation, unit is m
3/ t; Δ t is interval transit time, and unit is μ s/m; Rt is resistivity, and unit is Ω m; Wherein, A, C, D are linear fit coefficient;
According to the shale gas air content that above two kinds of methods draw, calculate the arithmetic average of the total air content of shale
Cz=(Cz
1+ Cz
2)/2 formula (3);
Namely shale gas air content is obtained.
Tentatively obtaining shale gas air content method in described step 1 is:
(1) record to separate in analyzer rock gas volume in time and the data of temperature variation, records and resolves tolerance and residual volume;
(2) by straight-line method and polynomial method matching analytic curve, counter pushing away derives from the gas volume that release between shale bed to rock sample sealing met by brill, namely loses gas; Namely resolution gas, residual gas and loss gas three sum tentatively obtain shale gas air content shale gas air content.
The method measuring described residual volume is:
(1) resolve speed and obtain residual volume lower than after 1.5ml/min by the method raising resolution temperature;
(2) after step (1), resolve speed lower than after 10ml/d, after rock sample grinding being smashed, record residual volume.
TOC value in described step 2 can utilize Exxon TOC computation model Δ lgR to obtain:
formula (4);
Wherein, Δ lgR is the distance between two curves; R is well logger actual measurement resistivity, and unit is Ω m;
for the resistivity that baseline is corresponding, unit is Ω m; Δ t is the interval transit time of actual measurement, and unit is μ s/ft;
for the interval transit time that baseline is corresponding, unit is μ s/ft; K is coefficient of region;
formula (5);
In formula: TOC is the organic carbon content calculated, and unit is %; LOM is maturity of organic matter.
Described step 3 adsorption isotherm experiment utilizes Lan Shi isothermal adsorption patterns: Gs=VL*P/ (PL+P), and wherein experimental temperature is corresponding formation temperature, and oil bath pan temperature control precision is 0.1 DEG C, and pressure measurement accuracy is 0.1psi; In formula, Gs represents shale maximum adsorption ability under formation conditions; VL is Langmuir volume, and PL is Langmuir pressure-constant, and P is reservoir pressure.
By the variation characteristic of comparative study shale adsorptive power in plane and longitudinal direction in described step 4, the relation of comparative study shale adsorptive power and on-the-spot resolution gas air content, sets up shale adsorptive power simultaneously
and the calculated relationship between TOC:
=E × TOC+F; Formula (6);
Wherein, the value of E and F is drawn by adsorption isotherm experiment.
In the zone of interest of described shale gas field, each sample is homogeneous terrestrial facies shale.
Described shale gas air content utilizes USBM method to calculate.
Advantage of the present invention is:
(1) nonuniformity of shale reservoir is fully taken into account, the problem that the physical property that the difference solving each reservoir samples embodies, organic carbon, adsorptive power, gas-bearing property etc. there are differences;
(2) by dividing into groups to all core analysis samples in each reservoir, having expanded sample space, having strengthened the weight with typicalness and representative sample, improved the accuracy calculated;
(3) apply logging trace and calculate shale gas air content, developed the method that air content calculates, be more conducive to setting up the relation between shale electrical property feature and air content, reach efficient and easy object.
Accompanying drawing explanation
Fig. 1 is methane gas instantaneous conversion rate in the simulated experiment of step 2 hydrocarbon-generating dynamics.
Fig. 2 is that in the simulated experiment of step 2 hydrocarbon-generating dynamics, methane gas adds up conversion ratio.
Fig. 3 is C in the simulated experiment of step 2 hydrocarbon-generating dynamics
2-C
5gas instantaneous conversion rate.
Fig. 4 is C in the simulated experiment of step 2 hydrocarbon-generating dynamics
2-C
5gas adds up conversion ratio.
Fig. 5 is the actual instantaneous conversion rate of methane gas.
Fig. 6 is the actual accumulative conversion ratio of methane gas.
Fig. 7 is Fig. 3 is C
2-C
5the actual instantaneous conversion rate of gas.
Fig. 8 is C
2-C
5the actual accumulative conversion ratio of gas.
Fig. 9 is X gas field shale samples TOC value and adsorptive power graph of a relation.
Figure 10 is that shale gas directly resolves air content and unary linear regression equation calculates air content linear correlation figure.
Figure 11 is that in step 5, shale gas directly resolves air content and binary linear regression equation calculates air content linear correlation figure.
Figure 12 is the long 7 shale resolution gas content of well and log curve correlation result.
Extend group leader 7 Zhang Jia beach shale for Southeast Area of Ordos Basin shale gas field (numbering X district), in conjunction with on-the-spot parsing, hydrocarbon-generating dynamics simulated experiment and adsorption isotherm experiment, utilize logging trace to calculate terrestrial facies shale gas air content, step is as follows:
First y pound sign of test oil district zone of interest is set, to zone of interest coring in the degree of depth preset, be respectively yy-1 ... ..yy-n, rock core food texture measurement is utilized to test out corresponding parameter in these rock cores, and the well logging of corresponding rock core, log data, sample is divided into three groups, is respectively yy-1-1, yy-1-2, yy-1-3, yy-2-1, yy-2-2, yy-2-3 are until yy-y-3.
Step 1: resolve on-the-spot under simulated formation temperature conditions for the first increment product, measure the gas flow naturally desorbed in shale samples; Method by raising resolution temperature after parsing speed is lower than 1.5ml/min obtains residual volume, then derive from by straight-line method and counter the pushing away of polynomial method matching analytic curve the gas volume that release between shale bed to rock sample sealing met by brill, namely lose gas, namely resolution gas and residual gas sum tentatively obtain shale gas air content shale gas air content.
Resolution speed before reaching formation temperature is generally between 2-3ml/min, resolution speed after reaching formation temperature becomes large gradually, generally 8-10ml/min can be reached, namely tolerance is lost in drilling and coring delivery process less, on-the-spot gas content (resolution gas+residual gas) of directly resolving, slightly lower than actual air content, can represent the true air content of shale substantially.Above shale samples resolution gas content (Directly solution gassing) mainly concentrates on 1.2 ~ 1.8m
3between/t, average out to 1.65m
3/ t, reaches as high as 3.3m
3/ t(table 1).
Table 1X gas field shale samples resolution data table
Note: "/" represents does not test this item number certificate
Step 2: second part of shale samples is carried out to the hydrocarbon-generating dynamics simulated experiment under open system.In sample heating process, methane gas starts raw hydrocarbon after 400 DEG C, reaches raw hydrocarbon peak, slowly reduce afterwards 500 DEG C-550 DEG C time.1000 DEG C time, raw methane terminates substantially, and the ability of the raw methane of sample reaches the limit.The formation stages of ethane gas is more concentrated, is formed from 400 DEG C, and reach at 450-500 DEG C and form peak, 600 DEG C are terminated substantially.C
2-C
5the stage productive rate variation diagram of gas is similar with ethane, is formed from 400 DEG C, and reach at 450-500 DEG C and form peak, 600 DEG C are terminated substantially.
Utilize dynamics fitting software, the factor of created gase of hydrocarbon-generating dynamics simulated experiment is calculated as conversion ratio.Obtain and reach 25% 50 DEG C of warm rank methane instantaneous conversion rates, accumulation conversion ratio reaches 40%, C
2-C
5gas instantaneous conversion rate 40 ~ 45%, accumulation conversion ratio is greater than 60%(as Fig. 1-Fig. 4); Calculating the potentiality generating methane is 85.36ml/gTOC, generates C
2-C
5potentiality be 33.42ml/gTOC, add up to that to generate total potentiality of hydrocarbon gas be 118.78ml/gTOC, wherein, the calculating of TOC value by and draw, the rock gas of formation forms wetter, and heavy hydrocarbon gas content is relatively high.
In conjunction with hydrocarbon-generating dynamics simulated experiment, in wellblock, the long 7 sections of actual overall yields of gas of Triassic Yanchang Formation are 53.5ml/gTOC, wherein methane and C
2-C
5gas actual yield is respectively 29.9ml/gTOC and 23.6ml/gTOC(as Fig. 5-Fig. 8).According to the shale organic carbon content of foundation and the relation of unit shale samples amount of coalbed methane generated
, utilize TOC data to calculate shale samples and generate hydrocarbon gas total amount between 1.23 ~ 4.01m3/t, average amount of coalbed methane generated is 2.30m3/t.
Step 3: utilize 300 type isothermal adsorption instruments to carry out adsorption isotherm experiment to triplicate sample.Experimental result shale maximum adsorption ability maximal value is 3.38m3/t, and minimum value is 0.52m3/t, is mainly distributed between 1.2 ~ 2.8m3/t, on average can reach 1.82m3/t(table 2).
2 gas field shale methane isotherm adsorption data accorded tables
Step 4: the variation characteristic of comparative study shale adsorptive power in plane and longitudinal direction, the relation of comparative study adsorptive power and on-the-spot resolution gas content, utilizes aforementioned gained maximum adsorption ability and corresponding sample TOC, set up the experimental formula of calculated relationship simultaneously.Then the TOC value of shale samples is utilized to calculate the maximum adsorption ability of shale samples.As in Fig. 9 being X gas field shale samples TOC value and adsorptive power graph of a relation.
=0.2339×TOC+0.0494
Step 5: by step 2 and step 4 the data obtained, experiment gained shale gas air content data are resolved to step 1 and correct, by shale gas air content data and the linear regression of shale log data, obtain shale gas air content (parsing tolerance) and interval transit time, the unitary of resistivity and binary linear regression equation and determine related coefficient (as Figure 10, Figure 11), total air content that two kinds of computing method obtain is averaged, obtains individual well air content in district.
Shale gas air content unary linear regression equation:
Cz
1=0.0047*Δt+0.1748
Shale gas air content binary linear regression equation:
Cz
2=0.0047*Δt-0.0001*Rt+0.1815
Complete long 7 shale Directly solution gassings in district based on above two kinds of computing method to calculate, 78.5% of total shale air content is accounted for according to Directly solution gassing, calculate the total air content of individual well shale, total air content that two kinds of computing method obtain averaged, in acquisition district, individual well air content is at 1.87-2.04m
3between/t (table 3), finally get arithmetic mean, determine that air content is 2.0m3/t.For yy16 well, the resolution gas content of long 7 shale samples of contrast and logging trace, both discoveries have obvious correlativity, as Figure 12.
The long 7 shale section air contents in 3 gas fields calculate tables of data
From above-described embodiment, each layer inner sample is utilized to carry out parsing experiment, raw hydrocarbon potentiality test and adsorptive power test, by calculating relation between resolution gas content and air content, and with the linear regression of shale log data, obtain shale gas air content and interval transit time, the unary linear regression equation of resistivity and binary linear regression equation, significantly improve counting yield and the accuracy of terrestrial facies shale gas air content.
Claims (8)
1. utilize logging trace to obtain a method for shale gas air content, it is characterized in that: comprise the steps:
Step 1: in the zone of interest of test shale gas field, take out n block core sample, every block is divided into three parts, measures by solution analyzer first part of shale samples and obtains logging trace and carry out scene resolving, tentatively obtain shale gas air content under simulated formation temperature conditions;
Step 2: carry out hydrocarbon-generating dynamics simulation test to second part of shale samples, utilize dynamics fitting software, is calculated as conversion ratio by the factor of created gase of hydrocarbon-generating dynamics simulated experiment result, record methane, C
2-C
5the potentiality of the raw hydrocarbon gas of the instantaneous conversion rate between 50 DEG C of warm rank peak hydrocarbon-generating stages, accumulation conversion ratio and sample; The accumulation utilizing known TOC value to calculate shale reality generates the amount of hydrocarbon gas;
Step 3: carry out adsorption isotherm experiment to the 3rd part of shale samples, obtains the main distribution range of maximum adsorption ability and the mean value of shale samples;
Step 4: the TOC value in integrating step 2 and the data of step 3 adsorption isotherm experiment, calculates shale adsorptive power;
Step 5: by step 2 and step 4 the data obtained, experiment gained shale gas air content data are resolved to step 1 and correct, by shale gas air content data and the linear regression of shale log data, obtain shale gas air content and interval transit time, the unary linear regression equation of resistivity and binary linear regression equation, and determine related coefficient;
Shale gas air content unary linear regression equation:
Cz
1=A* Δ t+B formula (1);
In formula, Cz
1for the shale gas air content calculated by unary linear regression equation, unit is m
3/ t; Δ t is interval transit time, and unit is μ s/m; Wherein, A, B are linear fit coefficient;
Shale gas air content binary linear regression equation:
Cz
2=A* Δ t-C*Rt+D formula (2);
In formula: Cz
2for the shale gas air content calculated by binary linear regression equation, unit is m
3/ t; Δ t is interval transit time, and unit is μ s/m; Rt is resistivity, and unit is Ω m; Wherein, A, C, D are linear fit coefficient;
According to the shale gas air content that above two kinds of methods draw, calculate the arithmetic average of the total air content of shale
Cz=(Cz
1+ Cz
2)/2 formula (3);
Namely shale gas air content is obtained.
2. a kind of method utilizing logging trace to obtain shale gas air content as claimed in claim 1, is characterized in that: tentatively obtaining shale gas air content method in described step 1 is:
(1) record to separate in analyzer rock gas volume in time and the data of temperature variation, records and resolves tolerance and residual volume;
(2) by straight-line method and polynomial method matching analytic curve, counter pushing away derives from the gas volume that release between shale bed to rock sample sealing met by brill, namely loses gas; Namely resolution gas, residual gas and loss gas three sum tentatively obtain shale gas air content shale gas air content.
3. a kind of method utilizing logging trace to obtain shale gas air content as claimed in claim 2, is characterized in that: the method measuring described residual volume is:
(1) resolve speed and obtain residual volume lower than after 1.5ml/min by the method raising resolution temperature;
(2) after step (1), resolve speed lower than after 10ml/d, after rock sample grinding being smashed, record residual volume.
4. a kind of method utilizing logging trace to obtain shale gas air content as claimed in claim 1, is characterized in that: the TOC value in described step 2 can utilize Exxon TOC computation model Δ lgR to obtain:
formula (4);
Wherein, Δ lgR is the distance between two curves; R is well logger actual measurement resistivity, and unit is Ω m;
for the resistivity that baseline is corresponding, unit is Ω m; Δ t is the interval transit time of actual measurement, and unit is μ s/ft;
for the interval transit time that baseline is corresponding, unit is μ s/ft; K is coefficient of region;
formula (5);
In formula: TOC is the organic carbon content calculated, and unit is %; LOM is maturity of organic matter.
5. a kind of method utilizing logging trace to obtain shale gas air content as claimed in claim 1, it is characterized in that: described step 3 adsorption isotherm experiment utilizes Lan Shi isothermal adsorption patterns: Gs=VL*P/ (PL+P), wherein experimental temperature is corresponding formation temperature, oil bath pan temperature control precision is 0.1 DEG C, and pressure measurement accuracy is 0.1psi; In formula, Gs represents shale maximum adsorption ability under formation conditions; VL is Langmuir volume, and PL is Langmuir pressure-constant, and P is reservoir pressure.
6. a kind of method utilizing logging trace to obtain shale gas air content as claimed in claim 4, it is characterized in that: by the variation characteristic of comparative study shale adsorptive power in plane and longitudinal direction in described step 4, the relation of comparative study shale adsorptive power and on-the-spot resolution gas air content, sets up shale adsorptive power simultaneously
and the calculated relationship between TOC:
=E × TOC+F; Formula (6);
Wherein, the value of E and F is drawn by adsorption isotherm experiment.
7. a kind of method utilizing logging trace to obtain shale gas air content as claimed in claim 1, is characterized in that: in the zone of interest of described shale gas field, each sample is homogeneous terrestrial facies shale.
8. a kind of method utilizing logging trace to obtain shale gas air content as claimed in claim 7, is characterized in that: described shale gas air content utilizes USBM method to calculate.
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