CN114429021A - Oil source comparison method - Google Patents
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Abstract
The invention relates to an oil source comparison method, and belongs to the technical field of oil-gas exploration and development. The oil source comparison method comprises the following steps: acquiring current standard generation parameters and current maturity of potential hydrocarbon source rocks and standard generation parameters of crude oil; obtaining the standard-producing parameters of the current residual oil in the potential hydrocarbon source rock according to the current maturity and the standard-producing parameter model of the residual oil; obtaining a recovery benchmarking parameter of the current residual oil in the potential hydrocarbon source rock according to the current maturity and the recovery benchmarking parameter model; further obtaining the living standard parameters of the currently discharged oil in the potential hydrocarbon source rock; obtaining the variable quantity of the crude oil standard generation parameters according to the crude oil standard generation parameters of the currently discharged oil and the crude oil standard generation parameters; and correcting the current living standard parameters of the potential hydrocarbon source rocks according to the living standard parameter variation, and further carrying out oil source comparison. According to the method, the change of the living standard parameters in the hydrocarbon source rock sedimentation process and the change of the living standard parameters in the hydrocarbon discharging process are considered, so that the accurate living standard parameters of the hydrocarbon source rock are obtained, and the accuracy of oil source comparison with crude oil is improved.
Description
Technical Field
The invention relates to an oil source comparison method, and belongs to the technical field of oil-gas exploration and development.
Background
The oil source comparison is an important link for finding the reservoir from the source or finding the source from the reservoir in the oil-gas exploration and development process, and is an important technical means for determining the oil-gas source, analyzing the oil-gas migration direction and predicting the distribution of the oil-gas reservoir.
The existing oil source comparison method is mainly realized by comparing the forms of the chromatogram, the chromatogram-mass spectrum fingerprint spectrum and the biomarker compound parameters of the soluble organic matters of the hydrocarbon source rock and the crude oil. Firstly, carrying out chromatographic and chromatographic-mass spectrometric analysis on soluble organic matters of source rocks, crude oil saturated hydrocarbons and aromatic hydrocarbons, and comparing spectrogram forms between the source rocks and the crude oil, wherein samples with similar spectrogram forms are considered to have a genetic relationship; secondly, selecting a representative biomarker compound to perform parameter calculation, and treating the source rock and the crude oil with similar parameters of the biomarker compound as the same source (namely the crude oil is generated by hydrocarbon expulsion of the source rock); and finally, carrying out comprehensive analysis to finish the final oil source contrast analysis.
The oil source comparison method is already mature, however, the burial depths of the oil-gas reservoir and the hydrocarbon source rock in the geologic body are generally different greatly, the hydrocarbon source rock can continue to be deeply buried along with the settlement of the stratum after hydrocarbon is discharged, the thermal evolution degree of the hydrocarbon source rock is generally higher than that of crude oil in the oil-gas reservoir, so that the maturity of the hydrocarbon source rock is higher than that of generated crude oil, and the content of the biomarker compounds in soluble organic matters of the hydrocarbon source rock is different greatly in thermal evolution stages with different maturity, so that the parameters (for short, the biomarker parameters) of the biomarker compounds can also be changed correspondingly; meanwhile, in the process of generating crude oil by hydrocarbon source rock, the phenomenon that the crude oil in an oil reservoir is different from the biomarker compound in the originally generated hydrocarbons also occurs, and finally, a great error occurs in an oil source comparison result.
Disclosure of Invention
The application aims to provide an oil source comparison method which is used for solving the problem that the existing oil source comparison result is inaccurate.
In order to achieve the purpose, the application provides a technical scheme of an oil source comparison method, which comprises the following steps:
1) acquiring current standard generation parameters and current maturity of potential hydrocarbon source rocks and standard generation parameters of crude oil;
2) obtaining the standard-producing parameters of the current residual oil in the potential hydrocarbon source rock according to the current maturity and the standard-producing parameter model of the residual oil; obtaining a recovery benchmarking parameter of the current residual oil in the potential hydrocarbon source rock according to the current maturity and the recovery benchmarking parameter model; the residual oil standard-generating parameter model is a first corresponding relation between maturity and standard-generating parameters; the recovery birth standard parameter model is a second corresponding relation between maturity and birth standard parameter recovery amount;
3) obtaining the living standard parameters of the currently discharged oil in the potential hydrocarbon source rock according to the living standard parameters of the currently residual oil and the recovery living standard parameters of the currently residual oil;
4) obtaining the variable quantity of the crude oil standard generation parameters according to the crude oil standard generation parameters of the currently discharged oil and the crude oil standard generation parameters;
5) correcting the current living standard parameters of the potential hydrocarbon source rocks according to the living standard parameter variation to obtain corrected living standard parameters of the potential hydrocarbon source rocks; and performing oil source comparison by using the corrected living standard parameters of the potential hydrocarbon source rock and the living standard parameters of the crude oil.
The technical scheme of the oil source comparison method has the beneficial effects that: according to the method, the living standard parameters and the recovery living standard parameters of the current residual oil in the potential hydrocarbon source rock are obtained through the current maturity of the potential hydrocarbon source rock, the established residual oil living standard parameter model and the recovery living standard parameter model, so that the living standard parameters of the current discharged oil are obtained, and the difference of the living standard parameters in the hydrocarbon discharging process is reduced; and then, the crude oil crude standard generation parameters and the crude oil standard generation parameters of the currently discharged oil are adopted to obtain the crude standard generation parameter variation, and the variation represents that: based on the assumption that the crude oil belongs to the potential hydrocarbon source rock, the current living standard parameter of the potential hydrocarbon source rock is corrected according to the variation to obtain the accurate living standard parameter of the potential hydrocarbon source rock when the crude oil is generated, so that the oil source comparison is completed, if the difference of the corrected living standard parameter is small after the oil source comparison is carried out, the crude oil is determined to be homologous with the potential hydrocarbon source rock, and if the difference of the corrected living standard parameter is still large after the oil source comparison is carried out under the assumption, the crude oil is not homologous with the potential hydrocarbon source rock. According to the method, the change of the living standard parameters in the hydrocarbon source rock sedimentation process and the change of the living standard parameters in the hydrocarbon discharging process are considered, so that the accurate living standard parameters of the hydrocarbon source rock are obtained, and the accuracy of oil source comparison with crude oil is improved.
Further, the maturity is vitrinite reflectance.
Further, in order to accurately obtain a residual oil upgrading parameter model and a recovery upgrading parameter model, the residual oil upgrading parameter model and the recovery upgrading parameter model are obtained by performing a hydrocarbon generation and discharge simulation experiment on the hydrocarbon source rock: in the experimental process, collecting residual oil and discharged oil of the hydrocarbon source rock at different stages to obtain the living standard parameters of the residual oil, the living standard parameters of the discharged oil and the maturity of the residual oil at different stages, and fitting according to the living standard parameters and the maturity of the residual oil at different stages to obtain a first corresponding relation between the maturity and the living standard parameters so as to obtain a residual oil living standard parameter model; and fitting according to the difference value between the living standard parameters of the residual oil and the living standard parameters of the discharged oil at different stages and the maturity to obtain a second corresponding relation between the maturity and the recovery amount of the living standard parameters, so as to obtain a recovery living standard parameter model.
Further, the residual oil calibration parameter model is as follows:
Ydisabled person＝a1Rn+b1Rn-1+c1Rn-2+······+k1；
Wherein: y isDisabled personThe raw standard parameters of the residual oil are shown; r is the maturity of residual oil; a is1、b1、c1… … is a polynomial coefficient of a residual oil calibration parameter model; k is a radical of1Is a constant of a residual oil calibration parameter model; n is a polynomial degree.
Further, the recovery biometric parameter model is:
Zrecovery＝a2Rn+b2Rn-1+c2Rn-2+······+k2；
Wherein: zRecoveryGenerating a standard parameter recovery quantity; r is the maturity of residual oil; a is2、b2、c2… … is a polynomial coefficient for recovering the living standard parameter model; k is a radical of2Constants for recovering the raw standard parametric model; n is a polynomial degree.
Further, the crude oil standard generation parameters in the step 1) are obtained according to actual measurement or according to the maturity of the crude oil and a residual oil standard generation parameter model.
Drawings
FIG. 1 is a flow chart of an oil source comparison method of the present invention;
FIG. 2 is a flow chart of the residual oil scaling parameter model and the recovery scaling parameter model.
Detailed Description
Oil source comparative method example:
the main concept of the oil source comparison method provided by the invention is that based on the problem that the hydrocarbon source rock continues to settle after hydrocarbon is discharged, so that the thermal evolution degree of the hydrocarbon source rock is different from that of crude oil, the maturity of the hydrocarbon source rock and the crude oil is different, and the biomarker parameters of homologous hydrocarbon source rock and crude oil are greatly different, and the oil source comparison is inaccurate, the method obtains the biomarker parameters of the potential hydrocarbon source rock corresponding to the crude oil stage by assuming that the crude oil and the potential hydrocarbon source rock are homologous and evolving the biomarker parameters of the crude oil and the currently discharged oil, and further obtains the biomarker parameters of the potential hydrocarbon source rock corresponding to the crude oil stage according to the change of the current biomarker parameters of the potential hydrocarbon source rock and the biomarker parameters in the settling process, so that the comparison result with the homologous crude oil is more accurate, and certainly, if under the homologous assumption, the obtained biomarker parameters of the hydrocarbon source rock corresponding to the crude oil are still greatly different from the biomarker parameters of the crude oil, then a non-homologous case is determined.
Specifically, the oil source comparison method is shown in fig. 1, and comprises the following steps:
1) and acquiring the current upgrading parameters of the potential hydrocarbon source rock, the current maturity and the upgrading parameters of the crude oil.
In the embodiment, the current maturity R of the potential hydrocarbon source rock is a vitrinite reflectance Ro of the current residual oil of the potential hydrocarbon source rock measured according to an industry standard SY/T5124-2012 vitrinite reflectance determination method in sedimentary rock;
the method is realized on the assumption that the crude oil is discharged from the potential hydrocarbon source rock, and soluble organic matters of the potential hydrocarbon source rock and crude oil saturated hydrocarbon and aromatic hydrocarbon biometric fingerprint data are obtained according to the current industry standards GB/T18340.5-2010 and GB/T18606-2001 when the current biometric parameters of the potential hydrocarbon source rock and the biometric parameters of the crude oil are obtained.
2) Obtaining the living standard parameters of the current residual oil in the potential hydrocarbon source rock according to the current maturity in the step 1) and a pre-established residual oil living standard parameter model; and obtaining the recovery benchmarking parameters of the current residual oil in the potential hydrocarbon source rock according to the current maturity and a pre-established recovery benchmarking parameter model.
The establishment process of the residual oil scaling parameter model and the recovery scaling parameter model is shown in fig. 2:
a. collecting potential source rock samples of different wells in a certain area, wherein the potential source rock is a possible source of crude oil, and obtaining the living standard parameters of soluble organic matters in the source rock according to industry standards, wherein the related parameters are shown in a table I:
table-one living standard parameter statistical table
As can be seen from Table one, the bid parameters include Pr/Ph, C30 */C30H、C19TT/C23TT、C20TT/C23TT、Ts/(Ts+Tm)、C29-ββ/(ββ+αα)、C29-20S/(20S +20R), rearranged sterane/regular sterane, with different values for the biochemical standard parameters in different potential source rock samples. And respectively carrying out finite space hydrocarbon generation and discharge simulation experiments on each potential source rock sample according to the generation standard parameters, and collecting residual oil and discharged oil in different thermal simulation stages. In this embodiment, the process of establishing the residual oil benchmarking parameter model and the recovery benchmarking parameter model is described by taking an experimental process of a certain potential source rock sample as an example.
b. And (3) carrying out chromatographic and chromatographic-mass spectrometric analysis on the residual oil and the discharged oil in different thermal simulation stages, calculating the scaling parameters of the residual oil and the historical discharged oil, and simultaneously testing the vitrinite reflectivity Ro of the residual oil in each thermal simulation stage.
c. B, establishing a correlation chart of the residual oil scaling parameters and the vitrinite reflectivity according to the scaling parameters of the residual oil and the vitrinite reflectivity of the residual oil obtained in the step b, performing data fitting, and establishing a polynomial numerical model of the relationship between the residual oil scaling parameters and the vitrinite reflectivity Ro to obtain the following residual oil scaling parameter model:
Ydisabled person＝a1Ro n+b1Ro n-1+c1Ro n-2+······+k1；
Wherein: y isDisabled personGenerating standard parameters for the residual oil; ro is vitrinite reflectance of residual oil, representing the maturity index,%; a is1、b1、c1… … is a polynomial coefficient of a residual oil calibration parameter model; k is a radical of1Is a constant of a residual oil calibration parameter model; n is a polynomial degree.
The established residual oil calibration parameter model is shown in table two:
mathematical model of two different biometric parameters
| Serial number | Raw standard parameters | Mathematical model | Coefficient of fit |
| 1 | Pr/Ph | Y＝0.6158x2-0.9408x+0.4793 | R2＝0.9914 |
| 2 | C30 */C30H | Y＝0.1193x2-0.2197x+0.1024 | R2＝0.9783 |
| 3 | C19TT/C23TT | Y＝0.0634x2-0.1188x+0.0805 | R2＝0.9401 |
| 4 | C20TT/C23TT | Y＝-0.7891x3+2.5209x2-2.4538x+0.9391 | R2＝0.995 |
| 5 | Ts/(Ts+Tm) | Y＝0.6034x2-1.2392x+0.7861 | R2＝0.9203 |
| 6 | C29-ββ/(ββ+αα) | Y＝0.0832x2-0.1456x+0.2431 | R2＝0.951 |
| 7 | C29-20S/(20S+20R) | Y＝0.0999x+0.0975 | R2＝0.9363 |
| 8 | Rearranged stanol/regular stanol | Y＝0.0294x2+0.0121x+0.0979 | R2＝0.9513 |
And similarly, subtracting the living standard parameters of the residual oil and the discharged oil obtained in the step b to obtain a living standard parameter recovery amount of the residual oil recovered to the discharged oil, establishing a correlation chart of the living standard parameter recovery amount and the vitrinite reflectivity of the residual oil, and performing data fitting to obtain a recovered living standard parameter model:
Zrecovery＝a2Ro n+b2Ro n-1+c2Ro n-2+······+k2；
Wherein: zRecoveryGenerating a standard parameter recovery quantity; ro is vitrinite reflectance of residual oil,%; a is2、b2、c2… … is a polynomial coefficient for recovering the living standard parameter model; k is a radical of2Constants for recovering the raw standard parametric model; n is a polynomial degree.
In this step, the normalized parameter recovery amount is the normalized parameter of the discharged oil-normalized parameter of the residual oil, or the normalized parameter recovery amount is the normalized parameter of the residual oil-normalized parameter of the discharged oil, and the calculation formulas corresponding to the normalized parameters of the current discharged oil are different for different formulas.
The finally obtained recovery mathematical models of different biometric parameters are shown in table three:
tabular three recovery raw standard parameter model
| Serial number | Raw standard parameters | Mathematical model | Coefficient of fit |
| 1 | Pr/Ph | Z＝0.5483x2-1.5758x+0.3511 | R2＝0.9885 |
| 2 | C30 */C30H | Z＝0.1709x3-0.5359x2+0.5276x-0.1919 | R2＝0.9123 |
| 3 | C19TT/C23TT | Z＝-0.2868x3+1.272x2-1.7721x+0.6506 | R2＝0.8531 |
| 4 | C20TT/C23TT | Z＝-0.1469x3+0.6389x2-0.8703x+0.311 | R2＝0.9517 |
| 5 | Ts/(Ts+Tm) | Z＝0.4243x3-1.3373x2+1.3209x-0.4582 | R2＝0.9901 |
| 6 | C29-ββ/(ββ+αα) | Z＝-0.0099x2+0.045x-0.1248 | R2＝0.9838 |
| 7 | C29-20S/(20S+20R) | Z＝0.0475x2-0.1104x-0.0649 | R2＝0.9246 |
| 8 | Rearranged stanol/regular stanol | Z＝-0.1985x3+0.6218x2-0.5117x+0.004 | R2＝0.9655 |
In the second and third tables, x in the expression represents vitrinite reflectance Ro, after the residual oil living standard parameter model and the recovery living standard parameter model are obtained, the current residual oil vitrinite reflectance of the potential source rock is brought into the residual oil living standard parameter model to obtain a living standard parameter of the current residual oil, and the current residual oil vitrinite reflectance of the potential source rock is brought into the recovery living standard parameter model to obtain a recovery living standard parameter of the current residual oil.
The characterization of the residual oil calibration parameter model is a first corresponding relation between vitrinite reflectivity and calibration parameters, and the characterization of the recovered calibration parameter model is a second corresponding relation between vitrinite reflectivity and calibration parameter recovery quantity, so that the method is not only suitable for residual oil, but also suitable for calculation of calibration parameters of different samples under different vitrinite reflectivities.
For different types of hydrocarbon source rocks, the residual oil upgrading parameter model and the recovery upgrading parameter model are different, in order to ensure the accuracy of the models, the method carries out hydrocarbon generation and discharge simulation experiments on the various types of hydrocarbon source rocks to obtain the residual oil upgrading parameter models and the recovery upgrading parameter models corresponding to the various types of hydrocarbon source rocks, and substitutes the current maturity of the potential hydrocarbon source rocks in the step 1) into the models with the same types as the potential hydrocarbon source rocks to obtain the corresponding current residual oil upgrading parameters and the current residual oil recovery upgrading parameters.
3) And obtaining the standard generating parameters of the currently discharged oil according to the standard generating parameters of the currently residual oil in the step 2) and the standard recovering parameters of the currently residual oil.
If the recovery benchmarking parameter model is established, the benchmarking parameter recovery amount is equal to the benchmarking parameter of the discharged oil-the benchmarking parameter of the residual oil, and then the benchmarking parameter of the current discharged oil is equal to the benchmarking parameter of the current residual oil + the recovery benchmarking parameter of the current residual oil; and if the recovery benchmarking parameter model is established, the benchmarking parameter recovery amount is equal to the benchmarking parameter of the residual oil-the benchmarking parameter of the discharged oil, and the benchmarking parameter of the current discharged oil is equal to the benchmarking parameter of the current residual oil-the recovery benchmarking parameter of the current residual oil.
4) And obtaining the variable quantity of the crude oil standard generation parameters according to the crude oil standard generation parameters of the currently discharged oil in the step 3) and the crude oil standard generation parameters in the step 1).
Since the crude oil is assumed to be discharged from the potential source rock, the variation of the scaling parameter is characterized by the variation of the scaling parameter of the potential source rock in the crude oil generation stage and the current stage. And generating standard parameter variable quantity, namely generating standard parameter of the current residual oil, namely generating standard parameter of the crude oil.
5) And correcting the current living standard parameters of the potential hydrocarbon source rocks in the step 1) according to the living standard parameter variation to obtain corrected living standard parameters of the potential hydrocarbon source rocks.
The corrected living standard parameter of the potential hydrocarbon source rock is the living standard parameter of the potential hydrocarbon source rock in the crude oil generation stage, and the corrected living standard parameter of the potential hydrocarbon source rock is the actual measurement living standard parameter-living standard parameter variable quantity of the current hydrocarbon source rock.
6) And comparing the oil source by using the corrected standard parameters of the potential hydrocarbon source rock and the standard parameters of the crude oil, if the standard parameters have small difference, the crude oil is characterized as being generated by hydrocarbon discharge of the potential hydrocarbon source rock, and if the standard parameters have large difference, the crude oil is not generated by hydrocarbon discharge of the potential hydrocarbon source rock.
In the above examples, the crude oil upgrading parameters in step 1) are calculated according to a method in the prior art, as another embodiment, the crude oil upgrading parameters may also be obtained through a crude oil maturity and residual oil upgrading parameter model, which is not limited in the present invention.
In the above embodiments, the vitrinite reflectance is used as a maturity index to perform the establishment of each model and the corresponding calculation, and as another embodiment, the thermal change index or the biological debris reflectance may also be used as a maturity index, which is not limited in the present invention.
The method corrects the living standard parameters of the potential hydrocarbon source rocks through thermal evolution and restores the hydrocarbon discharge process to obtain the living standard parameters of the potential hydrocarbon source rocks when the crude oil is generated, so that the error of oil source comparison is reduced. According to the method, errors of oil source comparison of the crude oil and the potential hydrocarbon source rock which belong to the same source are mainly eliminated, but according to experiments, the crude oil and the hydrocarbon source rock which do not belong to the same source have the condition that the difference between the corrected living standard parameters of the potential hydrocarbon source rock and the living standard parameters of the crude oil is large even under the assumption of the method, so that the assumption is established and can be used as the basis of the oil source comparison.
Claims (6)
1. An oil source comparison method is characterized by comprising the following steps:
1) acquiring current standard generation parameters and current maturity of potential hydrocarbon source rocks and standard generation parameters of crude oil;
2) obtaining the standard-producing parameters of the current residual oil in the potential hydrocarbon source rock according to the current maturity and the standard-producing parameter model of the residual oil; obtaining a recovery benchmarking parameter of the current residual oil in the potential hydrocarbon source rock according to the current maturity and the recovery benchmarking parameter model; the residual oil standard-generating parameter model is a first corresponding relation between maturity and standard-generating parameters; the recovery birth standard parameter model is a second corresponding relation between maturity and birth standard parameter recovery amount;
3) obtaining the living standard parameters of the currently discharged oil in the potential hydrocarbon source rock according to the living standard parameters of the currently residual oil and the recovery living standard parameters of the currently residual oil;
4) obtaining the variable quantity of the crude oil standard generation parameters according to the crude oil standard generation parameters of the currently discharged oil and the crude oil standard generation parameters;
5) correcting the current living standard parameters of the potential hydrocarbon source rocks according to the living standard parameter variation to obtain corrected living standard parameters of the potential hydrocarbon source rocks; and performing oil source comparison by using the corrected living standard parameters of the potential hydrocarbon source rock and the living standard parameters of the crude oil.
2. The oil source comparison method of claim 1, wherein the maturity is vitrinite reflectance.
3. The oil source comparison method according to claim 1 or 2, wherein the residual oil benchmarking parameter model and the recovery benchmarking parameter model are obtained by performing hydrocarbon generation and discharge simulation experiments on a hydrocarbon source rock: in the experimental process, collecting residual oil and discharged oil of the hydrocarbon source rock at different stages to obtain the living standard parameters of the residual oil, the living standard parameters of the discharged oil and the maturity of the residual oil at different stages, and fitting according to the living standard parameters and the maturity of the residual oil at different stages to obtain a first corresponding relation between the maturity and the living standard parameters so as to obtain a residual oil living standard parameter model; and fitting according to the difference value between the living standard parameters of the residual oil and the living standard parameters of the discharged oil at different stages and the maturity to obtain a second corresponding relation between the maturity and the recovery amount of the living standard parameters, so as to obtain a recovery living standard parameter model.
4. The oil source comparison method according to claim 3, wherein the residual oil calibration parameter model is:
Ydisabled person＝a1Rn+b1Rn-1+c1Rn-2+……+k1；
Wherein: y isDisabled personThe raw standard parameters of the residual oil are shown; r is the maturity of residual oil; a is1、b1、c1… … is a polynomial coefficient of a residual oil calibration parameter model; k is a radical of1Is a constant of a residual oil calibration parameter model; n is a polynomial degree.
5. The oil source comparison method of claim 3, wherein the recovery biometric parameter model:
Zrecovery＝a2Rn+b2Rn-1+c2Rn-2+……+k2；
Wherein: zRecoveryGenerating a standard parameter recovery quantity; r is the maturity of residual oil; a is2、b2、c2… … is a polynomial coefficient for recovering the living standard parameter model; k is a radical of2Constants for recovering the raw standard parametric model; n is a polynomial degree.
6. The oil source comparison method as claimed in claim 1, wherein the crude oil standard-producing parameters in step 1) are obtained from actual measurement or from a model of crude oil maturity and residual oil standard-producing parameters.
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