CN105221133B - A kind of method and apparatus that content of organic carbon of hydrocarbon source rock is determined based on well logging multi-parameter - Google Patents
A kind of method and apparatus that content of organic carbon of hydrocarbon source rock is determined based on well logging multi-parameter Download PDFInfo
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Abstract
The invention discloses a kind of method and apparatus for determining content of organic carbon of hydrocarbon source rock based on well logging multi-parameter, this method comprises: 1) obtaining the log value of natural gamma, resistivity, interval transit time, compensated neutron and density in the organic carbon content value of hydrocarbon source rock rock core sample and the log of corresponding depth；2) corresponding relationship of organic carbon content and log value is established according to gained organic carbon content value and gained log value and is fitted to function；3) content of organic carbon of hydrocarbon source rock at different depth is determined according to gained function.The method that hydrocarbon source rock organic carbon is determined based on well logging multi-parameter of the invention, response of each log value of comprehensive natural gamma, resistivity, interval transit time, compensated neutron, density to content of organic carbon of hydrocarbon source rock, fitting function is established to be calculated, realize the continuity of organic carbon content calculated value in the longitudinal direction, calculated result and the organic carbon value goodness of fit of actual measurement are good, and computational accuracy is high.
Description
Technical field
The invention belongs to Logging technology fields, and in particular to a kind of to determine hydrocarbon source rock organic carbon based on well logging multi-parameter
The method of content also relates to a kind of device that content of organic carbon of hydrocarbon source rock is determined based on well logging multi-parameter.
Background technique
Hydrocarbon source rock, which refers to, has generated or has been possible to generate oil gas, or with the rock for generating And Hydrocarbon Potential, it is oil gas
The basis of reservoir-forming study, carrying out evaluation to hydrocarbon source rock can be appreciated that the oil generation ability and resource potential on stratum.
Organic carbon content mainly reflects the height of abundance of organic matter in source rock in hydrocarbon source rock.The premise similar in other conditions
Under, organic carbon content is higher, and hydrocarbon generation capacity is higher.Content of organic carbon of hydrocarbon source rock is mainly by hydrocarbon source rock lithology, rock constituents etc.
Factor controlling, and under DIFFERENT DEPOSITIONAL ENVIRONMENTS and different preservation conditions, the lithology of hydrocarbon source rock, rock constituents are different.Organic carbon contains
Amount is generally by carrying out experimental analysis acquisition to drilling and coring delivery sample, by drilling and coring delivery quantity and the limit of experimental analysis funds
System, it is impossible to continuous content of organic carbon of hydrocarbon source rock value is obtained, while hydrocarbon source rock has certain heterogeneity, to analyze sample
Average value represent the organic carbon content of a whole set of thick-layer hydrocarbon source rock, contribution or the shadow of high abundance or low abundance interval can be covered
It rings, the result of evaluation and actual conditions is caused to generate biggish error.
Well-log information has the characteristics that vertical continuity is good, high resolution, and many logs are able to reflect lithology, rock
The difference of component has closer response relation with hydrocarbon source rock, hydrocarbon source rock response characteristic is based on, in conjunction with certain technical side
Method can quantitatively determine organic carbon content using the acquired various parameters data of well logging.Rock not only can be substantially reduced
The heart analyzes statistical error caused by the influence factors such as finiteness, the randomness of sample, and can obtain continuous hydrocarbon source rock
Geochemical information can save a large amount of man power and material, have good application effect in research and production.
The calculation method of content of organic carbon of hydrocarbon source rock based on log parameter, at present application are relatively widely △ lgR mould
Type, with certain limitation: log response is the result of a variety of geologic(al) factor superpositions in rock, it is therefore desirable to from survey
Effective organic carbon content instruction parameter is extracted in well information, △ lgR model only selects interval transit time and resistivity two surveys
Well data do not account for the relationship of the well logging informations such as density, neutron, gamma Yu hydrocarbon source rock organic carbon as parameter；Especially not
With area, the transformation degree being subjected to due to sedimentary facies belt and later period is different, cause control content of organic carbon of hydrocarbon source rock value lithology,
There is also differences for rock constituents feature and its log response of parameter that can be directed to reflection；Secondly, the determination process of its baseline compared with
It to be cumbersome, is influenced by subjective factor, causes organic carbon prediction error larger, the requirement of current surveying accuracy is not achieved, constrains
The application and popularization of △ lgR method.Therefore, people continuously improve on the basis of traditional △ lgR model, and it is higher to find precision
Numerical procedure.
In the prior art, CN104636588A discloses a kind of method for calculating organic carbon content in hydrocarbon source rock, comprising: root
According to nutural potential logging curve, the instruction of the first shale content is calculated；According to Natural Gamma-ray Logging Curves, the second shale content is calculated
Instruction；According to neutron well logging curve, density log curve and interval transit time log, the lithologic index of sand shale is calculated；Root
According to first shale content instruction, second shale content instruction and the lithologic index, identified from the sand shale
Hydrocarbon source rock；According to the density log curve, the acoustic travel time logging curve and Resistivity log, the hydrocarbon source is calculated
Organic carbon content in rock.Wherein, bent according to the density log curve, the acoustic travel time logging curve and resistivity logging
Line calculates the organic carbon content in the hydrocarbon source rock according to following formula:
TOC=(algRt+bΔt+c)/ρ (2)
In above formula, TOC is the organic carbon content in the hydrocarbon source rock；RtFor the resistivity in the Resistivity log
Value, Δ t be the acoustic travel time logging curve in interval transit time, ρ be the affiliated density log curve of i in density value, a, b and
C is known coefficient.Above-mentioned calculation method increases the response to well logging density value on the basis of classical △ lgR model, centainly
The accuracy for calculating organic carbon content in hydrocarbon source rock is improved in degree, but only considers well logging resistivity, interval transit time and survey
Three parameters of well density are still excessively limited to calculate the organic carbon content of hydrocarbon source rock, and there are large errors, to computational accuracy
It improves limited, it is difficult to provide strong branch for the spatial distribution and predicting oil/gas development prospect of organic matter in fine description hydrocarbon source rock
It holds.
Summary of the invention
The object of the present invention is to provide a kind of methods for determining content of organic carbon of hydrocarbon source rock based on well logging multi-parameter, solve existing
There are calculation method computational accuracy and accuracy not high, there are problems that large error.
A second object of the present invention is to provide a kind of devices that content of organic carbon of hydrocarbon source rock is determined based on well logging multi-parameter.
In order to achieve the goal above, the technical scheme adopted by the invention is that:
A method of content of organic carbon of hydrocarbon source rock is determined based on well logging multi-parameter, including the following steps:
1) the organic carbon content value of hydrocarbon source rock rock core sample is obtained；Obtain the log that each rock core sample corresponds to depth
Middle natural gamma, resistivity, interval transit time, compensated neutron and density log value；
2) the corresponding of organic carbon content and log value is established according to organic carbon content value obtained by step 1) and gained log value
Relationship is simultaneously fitted to function；
3) content of organic carbon of hydrocarbon source rock at different depth is determined according to function obtained by step 2).
Before fitting function, respectively to the multiple parameters natural gamma of well logging, resistivity, interval transit time, compensated neutron,
The log value and actual measurement organic carbon content of density etc. carry out correlation analysis.Determine the organic carbon content value of different depth in well,
First to the natural gamma in the organic carbon content value and log of rock core depth, compensated neutron, density, interval transit time, electricity
Values of resistivity carries out curve correlation analysis, is fitted to function further according to analysis result and then calculates the organic carbon content of hydrocarbon source rock.
Natural gamma, resistivity, interval transit time, compensated neutron, the log value of density are related to actual measurement organic carbon content
Property is all satisfied square R of related coefficient2>0.1。
The method of the correlation analysis are as follows: the log value of establishment each log of sample rock core depth and actual measurement are organic
The scatter plot of carbon content, according to 3 trend, applied mathematics statistical method carries out linear regression, can obtain its correlation (R), R2
For square of related coefficient, value is bigger, and correlation is better.R2> 0.1 all has correlation, R2< 0.1 does not have correlation.
The expression formula of fitting gained function in step 2) are as follows:
In formula, y is content of organic carbon of hydrocarbon source rock, %；
R is resistivity logging value, Ω m；LgR is the logarithm of resistivity logging value；
Δ t is acoustic travel time logging value, us/m；
For compensated neutron log value, API；
γ is gamma ray log value, API；
ρ is density log value, g/cm3；
a0、a1、a2、a3、a4、a5For constant coefficient.
Above-mentioned formula (1) is improved based on classical Δ lgR model.Δ lgR model is by acoustic travel time logging song
Line and Resistivity log are overlapped, and acoustic travel time logging data use arithmetic coordinate, and Electric Log Data is using calculation
Art logarithmic coordinates；It is that baseline determines the spacing between two curves after baseline determines when two curves are consistent at certain depth
Reading on logarithmic resistance rate coordinate, i.e. Δ lgR determine.
Derivation calculating process of the invention is as follows:
In formula (3), Δ lgR is the amplitude difference of resistivity and porosity curve；RtFor hydrocarbon source rock formation log well resistivity value,
Ω·m；Δ t is hydrocarbon source rock formation well logging sonic differential time value, us/m；RBaselineFor the well logging resistivity value of non-hydrocarbon source rock section, Ω
m；ΔtBaselineFor the well logging sonic differential time value of non-hydrocarbon source rock section, us/m.
In formula (4), the physical significance of K value is the unit of resistivity under each interval transit time (1us/m) corresponding logarithmic coordinates
Number；When providing that each resistivity unit under logarithmic coordinates corresponds to 50us/m interval transit time meter full scale under arithmetic coordinate, K
Value is 0.02.
TOC=Δ lgR × 10(2.297-0.1688LOM)+ΔTOC (5)
In formula (5), TOC is the organic carbon content (%) calculated；LOM indicates that maturity of organic matter, Δ TOC contain for organic carbon
Background value is measured, need to artificially be determined.The advantages of this method is that interval transit time and resistivity overlapping can eliminate porosity to a certain extent
Influence to organic carbon log response.
(4) and (6) are brought into (3), then formula (3) can be derived further are as follows:
Since 1 mouthful of well is commonly present multiple baseline values, well section need to be divided to establish and explain relational expression, established in the depth bounds of model
Ro (reflectance of vitrinite) variation is general little, and 10 in this pattern (5)(2.297-0.1688LOM)It can be considered definite value, be denoted as A.It establishes
Formula (5) are modified in the depth bounds of model are as follows:
TOC=A × Δ lgR+ Δ TOC (8)
It brings formula (4) and formula (7) into formula (8), obtains
In formula (9), A, Δ tmax、Rmin, Δ Toc be constant, then formula (8) is also further improved are as follows:
TOC=a × lgR+b × Δ t+c (10)
In formula (10), a, b, c are the coefficient of fitting formula.
From formula (10) as can be seen that the calculating of content of organic carbon of hydrocarbon source rock does not need maturity indices, without artificial true
Determine baseline value, organic carbon content background value.But content of organic carbon of hydrocarbon source rock value is mainly by hydrocarbon source rock lithology, rock constituents etc.
Factor controlling, and in log parameter reflect lithology, rock constituents have interval transit time, resistivity, natural gamma, compensated neutron,
Multiple log parameters such as density, meanwhile, under DIFFERENT DEPOSITIONAL ENVIRONMENTS and different preservation conditions, stress to reflect lithology, rock constituents
Main log parameter is different, this is also that Δ lgR calculating method is fine in some regional adaptabilities, but some regional adaptabilities are very poor,
The main reason for cannot popularizing in an all-round way.The premise that the present invention influences content of organic carbon of hydrocarbon source rock value in each log parameter of synthesis
Under, consider the analysis of natural gamma, resistivity, interval transit time, compensated neutron, each curvilinear correlation such as density, to formula (10) into
Row improves, and inversely due to density and organic carbon content, is corrected using density to formula, calculation formula is such as
Under:
In formula, y is content of organic carbon of hydrocarbon source rock, %；R is resistivity logging value, Ω m；LgR is resistivity logging value
Logarithm；Δ t is acoustic travel time logging value, us/m；For compensated neutron log value；γ is gamma ray log value；ρ is density
Log value, g/cm3；a0、a1、a2、a3、a4、a5For constant coefficient.
In step 2), according to organic carbon content value obtained by step 1) and gained log value, using least square method, foundation has
The corresponding relationship of machine carbon content and log value is simultaneously fitted to function.
The resistivity logging value is obtained by Resistivity log；The acoustic travel time logging value passes through interval transit time
Log obtains；The compensated neutron log value is obtained by compensated neutron log curve；The gamma ray log value is logical
Cross Natural Gamma-ray Logging Curves acquisition；The density log value is obtained by density log curve.
Before the organic carbon content value for obtaining hydrocarbon source rock rock core sample, rock core is carried out to hydrocarbon source rock rock core sample to be measured
Playback.
The organic carbon content value of hydrocarbon source rock rock core sample described in step 1) is by the organic of core analysis experiment acquisition
Carbon measured value.
A kind of device determining content of organic carbon of hydrocarbon source rock based on well logging multi-parameter, including data acquisition module, data point
Analyse module, Function Fitting module and numerical value determining module；
The data acquisition module includes that actual measurement organic carbon content data acquisition module and log value obtain module, the reality
Organic carbon content data acquisition module is surveyed for obtaining the content of organic carbon of hydrocarbon source rock value that experimental analysis measures, the log value obtains
Modulus block for obtain each rock core sample correspond to natural gamma in the log of depth, resistivity, interval transit time, in compensation
The log value of son and density；
The data analysis module, content of organic carbon of hydrocarbon source rock value and each rock core for being obtained according to data acquisition module
The log value that sample corresponds to natural gamma in the log of depth, resistivity, interval transit time, compensated neutron and density carries out
Correlation analysis；
The Function Fitting module, for establishing content of organic carbon of hydrocarbon source rock value according to the analysis result of data analysis module
The survey of natural gamma, resistivity, interval transit time, compensated neutron and density in the log of depth corresponding with each rock core sample
The corresponding relationship of well value is simultaneously fitted to function；
The numerical value determining module, for determining having for different depth in well according to fitting function obtained by Function Fitting module
Machine carbon content.
Described determines that the device of content of organic carbon of hydrocarbon source rock further includes core Location module based on well logging multi-parameter, described
Core Location module is used to carry out core Location to rock core sample before data acquisition module obtains data.
The method for determining content of organic carbon of hydrocarbon source rock based on well logging multi-parameter of the invention, is obtaining hydrocarbon source rock rock core sample
Organic carbon content value and each rock core sample correspond to natural gamma in the log of depth, resistivity, interval transit time, compensation
On the basis of the log value of the multiple parameters such as neutron and density, established according to actual measurement organic carbon content value with gained log value organic
The corresponding relationship of carbon content and log value is simultaneously fitted to function, determines that the hydrocarbon source rock at different depth is organic further according to gained function
Carbon content；Under the premise of considering that more log parameters influence content of organic carbon of hydrocarbon source rock value, comprehensive natural gamma, resistivity,
Response of each log value such as interval transit time, compensated neutron, density to content of organic carbon of hydrocarbon source rock, to establish fitting function progress
It calculates, realizes the continuity of organic carbon content calculated value in the longitudinal direction, organic carbon value that calculated result and site-test analysis obtain
The goodness of fit is good, and computational accuracy is high；This method does not need maturity indices, does not need artificially to determine baseline value and organic carbon content yet
Background value substantially increases the convenience and objectivity of model.
The method for determining content of organic carbon of hydrocarbon source rock based on well logging multi-parameter of the invention, utilizes well-log information continuity
Feature good, longitudinal resolution is high, on the basis of carrying out core Location to cored interval, the well logging of analysis coring section is joined substantially
Number include the curve datas such as gamma ray log, resistivity logging, acoustic travel time logging, compensated neutron log and density log with
The correlation between organic carbon data is surveyed, the corresponding relationship between them is established, is fitted to function, and the function of fitting is answered
For the well interval of interest, to realize the prediction to the content of the interval hydrocarbon source rock organic carbon.The existing △ lgR method of this method is just
The advantages of victory, objectivity, and compensate for △ lgR method due to the disadvantage that control parameter is few, error is big and baseline is difficult to determine etc.,
The method overcome the influences for sampling and choosing the human factors such as sample, can be limited in individual well hydrocarbon source rock organic carbon analysis test sample
Under conditions of, entire interval of interest content of organic carbon of hydrocarbon source rock is calculated, can really, effectively reflect entire interval of interest hydrocarbon source
Rock organic carbon content realizes the objective and overall evaluation to hydrocarbon source rock；Have stronger adaptability again, especially degree of prospecting compared with
In low, the insufficient situation of analytical test data, the hydrocarbon source rock quality to basin or recess can be sufficiently met using this method
The demand of early stage quantitative assessment is carried out, the evaluation for basin or the hydrocarbon exploration potential that is recessed provides foundation；This method is quick, high
Effect, economy, have a vast market foreground and good popularizing value.
The device that content of organic carbon of hydrocarbon source rock is determined based on well logging multi-parameter of the invention, including data acquisition module, number
According to analysis module, Function Fitting module and numerical value determining module, each module cooperates, and can fast implement true based on log parameter
Determine content of organic carbon of hydrocarbon source rock.
Detailed description of the invention
Fig. 1 is Yichuan area T1 well coring section gamma ray curve and actual measurement organic carbon content cross plot in embodiment 1；
Fig. 2 is Yichuan area T1 well coring section resistivity curve and actual measurement organic carbon content cross plot in embodiment 1；
Fig. 3 is Yichuan area T1 well coring section interval transit time curve and actual measurement organic carbon content cross plot in embodiment 1；
Fig. 4 is Yichuan area T1 well coring section compensated neutron curve and actual measurement organic carbon content cross plot in embodiment 1；
Fig. 5 is Yichuan area T1 well coring section density curve and actual measurement organic carbon content cross plot in embodiment 1；
Fig. 6 is that Yichuan area T1 well coring section is surveyed organic carbon content and intersected with calculating organic carbon content in embodiment 1
Figure；
Fig. 7 is that Yichuan area T1 well coring section calculates organic carbon content and other methods comparison of computational results in embodiment 1
Figure；
Fig. 8 is that Yining Depression N4 well coring section is surveyed organic carbon content and intersected with calculating organic carbon content in embodiment 2
Figure；
Fig. 9 is the calculated result that the white sebkha group of Yining Depression N4 well calculates organic carbon content and other methods in embodiment 2
Compare figure；
Figure 10 is the module diagram for determining the device of content of organic carbon of hydrocarbon source rock in embodiment 3 based on well logging multi-parameter.
Specific embodiment
The present invention is further illustrated With reference to embodiment.
Embodiment 1
The method for determining content of organic carbon of hydrocarbon source rock based on well logging multi-parameter of the present embodiment, is pair with Yichuan sag T1 well
As being calculated, including the following steps:
1) well logging that the organic carbon content value and each rock core sample for obtaining hydrocarbon source rock core analysis sample correspond to depth is bent
The log value of the multiple parameters such as natural gamma, resistivity, interval transit time, compensated neutron and density in line, as shown in table 1；It is described
Log value comes from the individual features of homologous thread (natural gamma, resistivity, interval transit time, density and compensated neutron)；
The organic carbon value of 1 Yichuan area T1 well rock core depth of table and log value
2) the corresponding of organic carbon content and log value is established according to organic carbon content value obtained by step 1) and gained log value
Relationship is simultaneously fitted to function；Specifically:
Correlation analysis is carried out to each log and actual measurement organic carbon content: according to the data obtained in table 1, working out her
The scatter plot of valley area T1 each log of well rock core depth and actual measurement organic carbon content value, according to scatterplot trend, using number
It learns statistical method and carries out linear regression, can obtain its correlation (R), R2For square of related coefficient, value is bigger, and correlation is got over
It is good.R2> 0.1 all has correlation, R2< 0.1 does not have correlation.FIG. 1 to FIG. 5 be respectively Yichuan area T1 well rock core depth from
The cross plot of right gamma, resistivity, interval transit time, density and compensated neutron log curve and actual measurement organic carbon content value.Such as Fig. 1
Shown in~Fig. 5, ordinate is log respectively, and abscissa is the organic carbon content value of actual measurement, is as can be seen from the figure logged well
Curve (natural gamma, resistivity, interval transit time, density, compensated neutron) and organic carbon content related coefficient square are respectively
0.71,0.59,0.69,0.20,0.57, each log all has certain correlation with organic carbon content, wherein natural gal
Horse, resistivity, interval transit time, compensated neutron and organic carbon content value positive correlation, density and organic carbon content value are at negative
Correlativity；
On the basis of each log and actual measurement organic carbon content value analysis, the curve with correlation is utilized into minimum
Square law principle, survey by software the foundation of the fit correlation of organic carbon value and log, and is fitted to function；It is quasi-
Close the expression formula of gained function are as follows:
In formula, y is content of organic carbon of hydrocarbon source rock, %；R is resistivity logging value, Ω m；LgR is resistivity logging value
Logarithm；Δ t is acoustic travel time logging value, us/m；For compensated neutron log value；γ is gamma ray log value；ρ is density
Log value, g/cm3；a0、a1、a2、a3、a4、a5For constant coefficient；Wherein, lgR, Δ t,, γ, ρ value obtained by log,
And the log with correlation is selected to be calculated；
In the present embodiment, final resulting function expression is as follows:
3) content of organic carbon of hydrocarbon source rock at different depth is determined according to fitting function (11) obtained by step 2)；According to actual measurement
The function of TOC and log fitting, are contained using the organic carbon that the continuity of log can calculate different depth in well
Amount；
It is in order to intuitively observe the accuracy that above-mentioned fitting function calculates gained organic carbon content, Yichuan in table 2 is recessed
Falling into the TOC value that each rock core depth experiment of T1 well measures, this two groups of data draftings strike a bargain with the TOC value of above-mentioned fitting function calculating
It can scheme, as shown in Figure 6；
The TOC value that the TOC value and above-mentioned fitting function that each rock core depth experiment of 2 Yichuan sag T1 well of table measures calculate
| Serial number | Depth (m) | It surveys TOC (%) | It calculates TOC (%) |
| 1 | 718.5 | 0.65 | 0.48 |
| 2 | 744.27 | 0.41 | 0.87 |
| 3 | 744.65 | 0.69 | 0.74 |
| 4 | 745.65 | 0.43 | 0.40 |
| 5 | 746.40 | 0.44 | 0.15 |
| 6 | 747.65 | 1.24 | 0.96 |
| 7 | 747.95 | 4.67 | 4.03 |
| 8 | 748.45 | 3.44 | 3.92 |
| 9 | 756.5 | 0.88 | 0.68 |
| 10 | 782 | 0.71 | 0.98 |
In Fig. 6, abscissa indicates that the present embodiment calculates resulting content of organic carbon of hydrocarbon source rock by fitting function and (calculates
TOC), ordinate indicates the content of organic carbon of hydrocarbon source rock value (actual measurement TOC) that experiment measures, two groups of each rock core sample depth
The data degree of fitting of organic carbon content is higher, fitting coefficient 1, square R of related coefficient2=0.94, illustrate through fitting letter
The goodness of fit that number calculates acquired results and actual conditions is high, the present embodiment calculate gained content of organic carbon of hydrocarbon source rock accuracy compared with
It is high.
Fig. 7 is measured value, calculated value and the other methods (△ of Yichuan area T1 well hydrocarbon source rock organic carbon in embodiment 1
LgR) the comparison diagram of calculated result.As shown in fig. 7, first is classified as depth value in well, second is classified as lithology, third and fourth, five, six,
Seven column are all logs, respectively natural gamma, interval transit time, density, compensated neutron, resistivity curve.Bar in 8th column
Shape figure is organic carbon value that experimental analysis measures, and dotted line is organic carbon value that prior art △ lgR method is calculated, and solid line is
Organic carbon value that the present embodiment is calculated, by comparative analysis as can be seen that being had using what method of the invention was calculated
Machine carbon value curve and organic carbon value goodness of fit that site-test analysis obtains are preferable, and the precision calculated is higher.
Embodiment 2
The method for determining content of organic carbon of hydrocarbon source rock based on well logging multi-parameter of the present embodiment, is pair with Yining Depression N4 well
As being calculated, concrete operation step is the same as embodiment 1.
The resulting function expression of the present embodiment is as follows:
The embodiment is calculated into gained content of organic carbon of hydrocarbon source rock value and the organic carbon content value of measuring this two groups of numbers
According to cross plot is depicted as, as a result as shown in Figure 8.It is calculated from figure 8, it is seen that abscissa indicates the present embodiment by fitting function
Resulting content of organic carbon of hydrocarbon source rock (calculating TOC), the content of organic carbon of hydrocarbon source rock value (actual measurement that ordinate mark experiment measures
TOC), the data degree of fitting of two groups of organic carbon contents of each rock core sample depth is higher, fitting coefficient 0.99, phase relation
Several square R2=0.86, illustrate to calculate acquired results by fitting function and the goodness of fit of actual conditions is high, the present embodiment meter
It is higher to calculate gained content of organic carbon of hydrocarbon source rock accuracy.
Fig. 9 is that the white sebkha group calculating gained organic carbon content value of Yining Depression N4 well contains with actual measurement organic carbon in embodiment 2
Magnitude comparative diagram, the same with Fig. 7, first is classified as depth value in well, and second is classified as lithology, third and fourth, five, six, seven column all be survey
Well curve, respectively natural gamma, interval transit time, density, compensated neutron, resistivity curve.Stick plot is experiment in 8th column
The organic carbon value measured is analyzed, solid line is organic carbon value that the method for the present invention is calculated.Fig. 9, which is shown, to be shown using of the invention
Organic carbon value curve that method is calculated and organic carbon value goodness of fit that site-test analysis obtains are preferable, and the precision calculated is more
It is high.
Embodiment 3
The device that content of organic carbon of hydrocarbon source rock is determined based on well logging multi-parameter of the present embodiment, as shown in Figure 10, including rock
Heart playback module 1, data acquisition module 2, data analysis module 3, Function Fitting module 4 and numerical value determining module 5；
The core Location module 1 is returned for carrying out rock core to rock core sample before data acquisition module obtains data
Position；
The data acquisition module 2 includes actual measurement organic carbon content data acquisition module and log value obtains module, described
Actual measurement organic carbon content data acquisition module is used to obtain the content of organic carbon of hydrocarbon source rock value that experiment measures, and the log value obtains
Module corresponds to natural gamma in the log of depth, resistivity, interval transit time, compensated neutron for obtaining each rock core sample
With the log value of density；
The data analysis module 3, content of organic carbon of hydrocarbon source rock value and each rock for being obtained according to data acquisition module
Heart sample corresponds to the multiple parameters such as natural gamma in the log of depth, resistivity, interval transit time, compensated neutron and density
Log value carry out correlation analysis；
The Function Fitting module 4, for suggesting content of organic carbon of hydrocarbon source rock according to the analysis result of data analysis module
It is worth natural gamma, resistivity, interval transit time, compensated neutron and density etc. in the log of depth corresponding with each rock core sample
The corresponding relationship of the log value of multiple parameters is simultaneously fitted to function；
The numerical value determining module 5, for determining different depth in well according to fitting function obtained by Function Fitting module
Organic carbon content.
Above-mentioned each module uses this field routine techniques, as long as the modular structure for being able to achieve above-mentioned function is all feasible.
Determine the device of content of organic carbon of hydrocarbon source rock respectively to 1 He of embodiment based on well logging multi-parameter using the present embodiment
The method of embodiment 2 is verified, and acquired results are identical as embodiment 1,2.
Claims (7)
1. a kind of method for determining content of organic carbon of hydrocarbon source rock based on well logging multi-parameter, it is characterised in that: include the following steps:
1) the organic carbon content value of hydrocarbon source rock rock core sample is obtained；Each rock core sample is obtained to correspond in the log of depth certainly
Right gamma, resistivity, interval transit time, compensated neutron and density log value；
2) corresponding relationship of organic carbon content and log value is established according to organic carbon content value obtained by step 1) and gained log value
And it is fitted to function；The expression formula of function are as follows:
In formula, y is content of organic carbon of hydrocarbon source rock, %；
R is resistivity logging value, Ω m；LgR is the logarithm of resistivity logging value；
Δ t is acoustic travel time logging value, us/m；
For compensated neutron log value, API；
γ is gamma ray log value, API；
ρ is density log value, g/cm3；
a0、a1、a2、a3、a4、a5For constant coefficient；
3) content of organic carbon of hydrocarbon source rock at different depth is determined according to function obtained by step 2)；
Before fitting function, respectively to natural gamma, resistivity, interval transit time, compensated neutron, the log value of density and actual measurement
Organic carbon content carries out correlation analysis；Natural gamma, resistivity, interval transit time, compensated neutron, the log value of density and actual measurement
The correlation of organic carbon content is all satisfied square R of related coefficient2>0.1。
2. the method according to claim 1 for determining content of organic carbon of hydrocarbon source rock based on well logging multi-parameter, it is characterised in that:
In step 3), organic carbon content is established using least square method according to organic carbon content value obtained by step 1) and gained log value
With the corresponding relationship of log value and be fitted to function.
3. the method according to claim 1 for determining content of organic carbon of hydrocarbon source rock based on well logging multi-parameter, it is characterised in that:
The resistivity logging value is obtained by Resistivity log；The acoustic travel time logging value passes through acoustic travel time logging curve
It obtains；The compensated neutron log value is obtained by compensated neutron log curve；The gamma ray log value passes through nature gal
Horse log obtains；The density log value is obtained by density log curve.
4. the method according to claim 1 for determining content of organic carbon of hydrocarbon source rock based on well logging multi-parameter, it is characterised in that:
Before the organic carbon content value for obtaining hydrocarbon source rock rock core sample, core Location is carried out to hydrocarbon source rock rock core sample to be measured.
5. the method according to claim 1 for determining content of organic carbon of hydrocarbon source rock based on well logging multi-parameter, it is characterised in that:
The organic carbon content value of hydrocarbon source rock rock core sample described in step 1) is the organic carbon measured value obtained by core analysis experiment.
6. a kind of device for the method for being exclusively used in determining content of organic carbon of hydrocarbon source rock according to any one of claims 1 to 5,
It is characterized in that: including data acquisition module, data analysis module, Function Fitting module and numerical value determining module；
The data acquisition module includes that actual measurement organic carbon content data acquisition module and log value obtain module, and the actual measurement has
Machine carbon content data acquisition module obtains mould for obtaining the content of organic carbon of hydrocarbon source rock value that experimental analysis measures, the log value
Block for obtain each rock core sample correspond to natural gamma in the log of depth, resistivity, interval transit time, compensated neutron and
The log value of density；
The data analysis module, content of organic carbon of hydrocarbon source rock value and each rock core sample for being obtained according to data acquisition module
Natural gamma, resistivity, interval transit time, compensated neutron are related to the progress of the log value of density in the log of corresponding depth
Property analysis；
The Function Fitting module establishes content of organic carbon of hydrocarbon source rock value and each for the analysis result according to data analysis module
Rock core sample corresponds to the log value of natural gamma in the log of depth, resistivity, interval transit time, compensated neutron and density
Corresponding relationship and be fitted to function；
The numerical value determining module, for determining the organic carbon of different depth in well according to fitting function obtained by Function Fitting module
Content.
7. device according to claim 6, it is characterised in that: it further include core Location module, the core Location module
For carrying out core Location to rock core sample before data acquisition module obtains data.
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