CN110632274A - Method and device for determining hydrocarbon discharge efficiency of hydrocarbon source rock - Google Patents
Method and device for determining hydrocarbon discharge efficiency of hydrocarbon source rock Download PDFInfo
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Abstract
The invention provides a method and a device for determining hydrocarbon discharging efficiency of a hydrocarbon source rock. The method comprises the following steps: identifying and determining a longitudinal hydrocarbon drainage interval of a continental facies hydrocarbon source rock stratum system with strong heterogeneity according to the actually measured information and the logging information of the rock core; establishing a correlation among parameters such as organic carbon content of a hydrocarbon discharging stratum section of the source rock according to a unit volume source rock organic carbon substance balance model; deducing a quadratic equation of a first order related to the hydrocarbon discharge efficiency according to the correlation among the parameters, and determining specific parameters required by equation solving; calculating the numerical value of specific parameters required by the equation according to parameters such as the organic carbon content (TOC) of the source rock; calculating the hydrocarbon discharge efficiency K of the hydrocarbon source rock according to the established quadratic equationP. The method avoids the simulation of a complex hydrocarbon generation and discharge process, has the advantages of simple and visual principle, easy acquisition of calculation parameters and visual and accurate calculation result, and can quantitatively evaluate the hydrocarbon discharge efficiency of the hydrocarbon source rock; improve the resource content of the oil-gas-containing basin and the evaluation of exploration potentialReliability, wide applicability.
Description
Technical Field
The invention belongs to the technical field of petroleum geological exploration, and relates to a method and a device for determining hydrocarbon discharging efficiency of a hydrocarbon source rock.
Background
The hydrocarbon source rock is a primary target of exploration of the hydrocarbon-containing basin, is not only a material foundation for oil and gas accumulation and formation, but also one of main control factors for formation of the oil and gas accumulation, and the hydrocarbon generation and discharge potential of the hydrocarbon source rock determines the resource potential and the exploration value of the hydrocarbon-containing basin. At present, the evaluation methods for the potential of oil and gas resources at home and abroad mainly comprise a cause method, a similarity method, a statistical method, a Delphi (Delphi) method and the like, wherein the cause method is a method which is widely applied at present. The basic idea of applying the cause method to evaluate oil and gas resources is to predict the oil and gas resource potential of the basin from the research of the cause conditions of the generation, migration and aggregation of oil and gas in the earth crust until the formation of an oil and gas reservoir. Generally speaking, the hydrocarbon production amount of the basin (pit) hydrocarbon source rock is firstly estimated for evaluating the resource potential of the basin (pit), the hydrocarbon discharge amount of the hydrocarbon source rock is obtained by multiplying the hydrocarbon production amount by the hydrocarbon discharge efficiency, and the resource amount of the basin (pit) is obtained by multiplying the hydrocarbon discharge amount of the hydrocarbon source rock by a polymerization coefficient (aggregation coefficient) so as to obtain the oil and gas resource amount in an oil and gas polymerization system. In this process, the calculation of the hydrocarbon discharge amount is one of the key elements of resource evaluation, and if the reliability of the hydrocarbon generation amount estimation is high, the reliability of the hydrocarbon discharge amount estimation depends on the accuracy of the hydrocarbon discharge efficiency calculation.
The research method of the hydrocarbon discharge efficiency mainly comprises a basin simulation method, a hot-pressing simulation experiment method, an organic geochemical analysis method and the like. The basin simulation method mainly uses a corresponding mathematical model to obtain the hydrocarbon discharge efficiency on the basis of the existing geological model according to the hydrocarbon discharge mechanism of the hydrocarbon source rock, the method not only can calculate the current accumulated hydrocarbon discharge efficiency of the hydrocarbon source rock, but also can calculate the hydrocarbon discharge efficiency in different periods, but because the research aspect of the oil-gas accumulation mechanism is not complete at the present stage, an effective mathematical model is difficult to establish, and the support of statistical data from a mature exploration area is lacked, the value of the mathematical model is greatly influenced by subjective factors, and the reliability is lower. The hot-pressing simulation experiment method is characterized in that when a closed or semi-closed system is used for hydrocarbon generation thermal evolution simulation of a hydrocarbon source rock, a hydrocarbon discharge coefficient is calculated according to the oil gas yield and the oil gas quantity of a discharged rock sample, the method has the advantages that the collection and metering of hydrocarbon source rock generation and hydrocarbon discharge products are accurate in the simulation process, the hot-pressing simulation experiment temperature is high (generally above 250 ℃), the capillary resistance of oil gas in a sample is far lower than that in the oil gas migration process under the actual geological condition, and the hydrocarbon is discharged due to the fact that fluid expands when heated, so that the calculated hydrocarbon discharge efficiency of the hydrocarbon source rock is high. The organic geochemical analysis method is to calculate the hydrocarbon discharge efficiency by (hydrocarbon production amount-residual hydrocarbon amount)/hydrocarbon production amount by measuring the geochemical analysis data of the system in the natural evolution process of the actual hydrocarbon source rock. For a specific hydrocarbon source rock, the larger the residual hydrocarbon amount after hydrocarbon expulsion is, the smaller the hydrocarbon expulsion coefficient is, so the hydrocarbon expulsion coefficient ratio calculated by the method is simpler and more intuitive. However, due to the heterogeneity of the source rocks, especially in the continental basin, the simplified processing of the hydrocarbon production estimation process inevitably leads to a large error in the calculation of the hydrocarbon discharge efficiency.
Disclosure of Invention
Aiming at the problem that the hydrocarbon discharging efficiency of a strong heterogeneous hydrocarbon source rock stratum system in a terrestrial hydrocarbon-bearing basin is difficult to calculate, the invention aims to provide a method for determining the hydrocarbon discharging efficiency of the hydrocarbon source rock and a device for determining the hydrocarbon discharging efficiency of the hydrocarbon source rock; the method and the device avoid the simulation of the complex hydrocarbon generation and discharge process, have the advantages of simple and visual principle, easy acquisition of calculation parameters and visual and accurate calculation result, and can quantitatively evaluate the hydrocarbon discharge efficiency of the hydrocarbon source rock.
The purpose of the invention is realized by the following technical scheme:
in one aspect, the invention provides a method for determining the hydrocarbon discharging efficiency of a hydrocarbon source rock, which comprises the following steps:
identifying and determining a longitudinal hydrocarbon drainage interval of a continental-phase hydrocarbon source rock stratum system with strong heterogeneity according to actual measurement data and logging data of a rock core;
establishing a correlation among parameters of the content of organic carbon in a hydrocarbon discharging stratum section of the source rock, the degradation rate of organic matters, the mass of organic carbon in the original hydrocarbon production potential of kerogen, the mass of effective carbon in the pyrolysis hydrocarbon of the kerogen and the hydrocarbon discharging efficiency according to a unit volume source rock organic carbon substance balance model;
deducing a quadratic equation of a first order related to the hydrocarbon discharge efficiency according to the correlation among the parameters, and determining specific parameters required for solving the equation;
fourthly, according to the organic carbon content TOC, the pyrolysis parameter and the organic matter maturity parameter R of the source rockOCalculating the numerical value of a specific parameter required by an equation of the parameter A of the soluble organic chloroform asphalt;
step five, calculating the hydrocarbon discharging efficiency K of the hydrocarbon source rock according to the established quadratic equationP。
In the above determination method, preferably, the pyrolysis parameter includes hydrocarbon generation potential S1+S2Hydrogen index HI, maximum pyrolysis peak temperature Tmax and residual degradation rate DT。
In the above determination method, preferably, the correlation of each parameter is established according to a unit volume source rock organic carbon material equilibrium model, and the specific relationship includes the following:
CO＝CR+CP
CG＝CP+CA
SOC＝CG+S2C
wherein, CORepresenting the original total organic carbon of the source rock, mg/g; cGRepresenting the organic carbon in the hydrocarbon product accumulated in the hydrocarbon source rock, mg/g; cPRepresenting organic carbon in the hydrocarbon source rock hydrocarbon discharging product, mg/g; cRRepresenting residual organic carbon in the source rock, mg/g; cAThe carbon content of the residual soluble organic matter of the hydrocarbon source rock is expressed as mg/g; dORepresents the original degradation rate,%; dTIndicates the residual degradation rate of organic matter,%; sOCRepresenting the mass of organic carbon in the original hydrocarbon production potential of kerogen, mg/g; s2CRepresents the effective carbon mass in the kerogen pyrolysis hydrocarbon, mg/g; kPRepresents the efficiency of hydrocarbon removal,%.
In the above determination method, preferably, a quadratic equation of a single element relating to the hydrocarbon discharge efficiency is derived according to the correlation between the parameters, and the method for determining the specific parameters required for solving the equation is as follows:
determining the following quadratic equation according to the correlation among the parameters:
wherein a, b and c are constant terms, and the specific determination formula is as follows:
c＝CR×(CA+S2C-DO×CR)
from the above formula, the specific parameter required for determination is DO、CR、S2CAnd CA。
In the above determination method, the mass C of the organic carbon remaining in the source rock per unit volume is preferably determined based on the TOC content of the organic carbon in the source rockR(ii) a The method specifically comprises the following steps: in actual operation, under the influence of thermal evolution degree and hydrocarbon generation and discharge processes, the TOC (total organic carbon) content in the source rock measured by a laboratory is the mass of the organic carbon remained in the source rock at present, so that the TOC data is actually measured to replace the mass of the organic carbon remained in the source rock in unit volume.
In the above determination method, preferably, the pyrolysis parameter S is determined according to the source rock1+S2Determination of the effective carbon mass S in kerogen pyrolysis hydrocarbons2CThe concrete formula is as follows:
S2C＝(S1+S2)×0.083。
in the above determination method, preferably, the mass C of organic carbon in the residual soluble organic matter of the source rock is determined according to the soluble organic matter chloroform bitumen "A" and the light hydrocarbon compensation coefficients of the pyrolysis of different types of source rocks in each thermal evolution stageA。
In the above determination method, preferably, the residual degradation rate D of the source rock is determined according toTThe method is characterized in that the method is a main ordinate, the pyrolysis parameter hydrogen index HI is a secondary ordinate, the maximum pyrolysis peak temperature Tmax is a main abscissa, the vitrinite reflectivity Ro is a secondary abscissa, a plot of organic matter degradation rate and maximum pyrolysis peak temperature in a certain area is established, and the original degradation rate of organic matter is comprehensively determined.
In another aspect, the present invention provides an apparatus for determining the hydrocarbon-discharging efficiency of a source rock, the apparatus comprising:
the hydrocarbon drainage layer section identification module is used for identifying and determining the longitudinal hydrocarbon drainage layer section of the strong heterogeneous continental facies hydrocarbon source rock stratum system according to the actual measurement data and the logging data of the rock core;
the parameter relational model establishing module is used for establishing the correlation among the parameters of the organic carbon content, the organic matter degradation rate, the organic carbon mass in the original hydrocarbon production potential of kerogen, the effective carbon mass in the pyrolysis hydrocarbon of kerogen and the hydrocarbon discharge efficiency of the hydrocarbon discharge stratum section of the hydrocarbon source rock according to the unit volume hydrocarbon source rock organic carbon matter balance model;
the hydrocarbon discharge efficiency equation solving parameter determining module is used for deducing a quadratic equation of unitary related to hydrocarbon discharge efficiency according to the correlation among the parameters and determining specific parameters required by equation solving;
the solution parameter calculation module is used for calculating the numerical values of specific parameters required by the equation according to the organic carbon content TOC of the source rock, the pyrolysis parameters, the organic matter maturity parameter RO and the soluble organic matter chloroform asphalt 'A' parameter;
a hydrocarbon discharge efficiency determination module used for calculating hydrocarbon discharge efficiency K of the source rock according to the established quadratic equationP。
In one aspect, the present invention also provides an apparatus for determining hydrocarbon-removal efficiency from a source rock, comprising a processor and a memory for storing processor-executable instructions, the instructions when executed by the processor result in:
identifying and determining a longitudinal hydrocarbon drainage interval of a continental facies hydrocarbon source rock stratum system with strong heterogeneity according to the actually measured information and the logging information of the rock core;
establishing a correlation among parameters of the content of organic carbon, the degradation rate of organic matters, the mass of organic carbon in the original hydrocarbon production potential of kerogen, the mass of effective carbon in the pyrolysis hydrocarbon of kerogen and the hydrocarbon discharge efficiency of the hydrocarbon discharge stratum of the hydrocarbon source rock according to a unit volume hydrocarbon source rock organic carbon matter balance model;
deducing a quadratic equation of a first order related to the hydrocarbon discharge efficiency according to the correlation among the parameters, and determining specific parameters required by equation solving;
calculating the numerical value of specific parameters required by an equation according to the organic carbon content TOC of the source rock, the pyrolysis parameters, the organic matter maturity parameter RO and the soluble organic matter chloroform asphalt 'A' parameter;
calculating the hydrocarbon discharge efficiency K of the hydrocarbon source rock according to the established quadratic equationP。
The method for calculating the hydrocarbon discharging efficiency of the strong heterogeneity hydrocarbon source rock in the terrestrial hydrocarbon-containing basin is called as an original hydrocarbon potential recovery method, and is based on the organic carbon substance balance principle in the hydrocarbon discharging process of the hydrocarbon source rock, namely, the absolute content of organic carbon which can not be converted into hydrocarbon is constant in the generation, migration and aggregation processes of oil gas.
According to actual measurement data and logging data of a rock core, a longitudinal hydrocarbon drainage layer section of a strong heterogeneous continental facies hydrocarbon source rock layer system is identified and determined, correlation among parameters of organic carbon content TOC, pyrolysis parameters, organic matter maturity parameters Ro, soluble organic matter chloroform bitumen 'A' parameters and kerogen types of the hydrocarbon source rock drainage layer section is established according to a unit volume hydrocarbon source rock organic carbon matter balance model, a hydrocarbon drainage efficiency calculation equation is deduced according to the correlation, and the hydrocarbon drainage efficiency of the hydrocarbon source rock drainage layer section is calculated according to actually required parameters.
The technical scheme provided by the invention avoids the simulation of a complex hydrocarbon generation and expulsion process, converts the geological process of hydrocarbon source rock hydrocarbon generation and expulsion into a mathematical reasoning process, has the advantages of simple and intuitive principle, easy acquisition of calculation parameters and intuitive and accurate calculation result, achieves the technical effect of quantitatively evaluating the hydrocarbon source rock hydrocarbon expulsion efficiency, provides a feasible technical method for oil and gas resource evaluation, improves the credibility of the oil and gas basin resource amount and exploration potential evaluation, and has wide applicability.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below, it is obvious that the drawings in the following description are only some embodiments described in the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.
FIG. 1 is a flow chart of a method for determining hydrocarbon efficiency of a source rock according to an embodiment of the present disclosure;
FIG. 2 is a theoretical model of organic carbon material equilibrium per unit volume of source rock in an embodiment of the present invention;
FIG. 3 is a graph of organic matter degradation rate and peak pyrolysis temperature;
fig. 4 is a structural framework diagram of the device for determining the hydrocarbon discharging efficiency of the source rock in the embodiment of the invention.
Detailed Description
The technical solutions of the present invention will be described in detail below in order to clearly understand the technical features, objects, and advantages of the present invention, but the present invention is not limited to the practical scope of the present invention.
In view of the limitations of existing methods of hydrocarbon extraction efficiency calculation and the heterogeneity of continental source rock formations, the inventors propose the following method to determine the hydrocarbon extraction efficiency of such source rock formations. The following describes the technical solution of the embodiment of the present invention in detail.
The embodiment provides a method for determining hydrocarbon discharging efficiency of a hydrocarbon source rock, as shown in fig. 1, which includes the following steps:
s101: identifying and determining a longitudinal hydrocarbon drainage interval of a continental facies hydrocarbon source rock stratum system with strong heterogeneity according to the actually measured information and the logging information of the rock core; selecting regional multi-opening single-well hydrocarbon source rocks, carrying out system sampling and geochemical experimental analysis, and determining organic carbon content TOC, pyrolysis parameters, organic matter maturity parameters Ro, soluble organic matter chloroform bitumen 'A' parameters and kerogen types of the hydrocarbon source rocks;
in this embodiment, a five-segment hydrocarbon source rock formation of a down-depressed Chinese forest group is taken as an example. The five sections of the xu-family river group in the example area serve as important gas source rock strata series in the whole area, the five sections of the xu-family river group and the overlying Jurassic strata form one of main gas reservoir combinations in the example area, a set of compact gas reservoir combinations which are generated from a storage self-cover are formed inside the five sections of the xu-family river group, and the example is mainly described by taking the compact gas reservoir combinations inside the five sections of the xu-family river group as an example. Five segments of the xu-Jia river group mainly develop the front edge of the delta-the shallow lake facies deposition, and the lithology is shale, silty mudstone, argillaceous siltstone, sand mudstone thin interbedded layer and the like. The abundance of organic matters is high, the TOC is 0.39-16.33 percent and reaches 2.35 percent on average; kerogen is mainly type III, and part is II2Molding; ro value is 0.1% -2.17%, average is 1.18%, mainly 0.8% -1.3%, and is in maturation-high maturation evolution stage. At present, the exploration of natural gas in five sections of the Heyawa group has made an important progress in the newThe field area discovers a dense gas reservoir and forms a reserve scale, thereby realizing the strategic transition of five sections of the beard family river group from a single hydrocarbon source rock layer system to an unconventional dense gas exploration layer system.
Identifying and determining longitudinal hydrocarbon drainage layer sections of a strong heterogeneous continental facies hydrocarbon source rock layer system according to core actual measurement data and logging data, preferably selecting a well A, a well B and a well C as typical wells respectively to perform system sampling and geological experimental analysis, and determining the organic carbon content TOC, pyrolysis parameters, organic matter maturity parameters Ro, soluble organic matter chloroform bitumen 'A' parameters and kerogen types of the hydrocarbon source rock;
the four source storage configuration relations of main development in five sections of hydrocarbon source rock strata can be determined through analysis of actual measurement data and logging data of a rock core as shown in table 1, wherein sand-shale interbedded sections are smooth hydrocarbon drainage sections, sand-rich sections are hydrocarbon drainage sections, mud-rich sections are hydrocarbon drainage unsmooth sections, and thick-layer shale sections are non-hydrocarbon drainage sections.
Table 1:
s102: establishing a correlation among parameters of the content of organic carbon, the degradation rate of organic matters, the mass of organic carbon in the original hydrocarbon production potential of kerogen, the mass of effective carbon in the pyrolysis hydrocarbon of kerogen and the hydrocarbon discharge efficiency of the hydrocarbon discharge stratum section of the source rock according to a unit volume source rock organic carbon matter balance model (shown in figure 2); the specific relationship includes the following:
CO＝CR+CP
CG＝CP+CA
SOC＝CG+S2C
wherein, CORepresenting the original total organic carbon of the source rock, mg/g; cGRepresenting the organic carbon in the hydrocarbon product accumulated in the hydrocarbon source rock, mg/g; cPRepresenting organic carbon in the hydrocarbon source rock hydrocarbon discharging product, mg/g; cRRepresenting residual organic carbon in the source rock, mg/g; cAThe carbon content of the residual soluble organic matter of the hydrocarbon source rock is expressed as mg/g; dORepresents the original degradation rate,%; dTIndicates the residual degradation rate of organic matter,%; sOCRepresenting the mass of organic carbon in the original hydrocarbon production potential of kerogen, mg/g; s2CRepresents the effective carbon mass in the kerogen pyrolysis hydrocarbon, mg/g; kPRepresents the efficiency of hydrocarbon removal,%.
S103: and deducing a quadratic equation of a first order related to the hydrocarbon discharge efficiency according to the correlation among the parameters, and determining specific parameters required for solving the equation.
Determining the following quadratic equation according to the correlation among the parameters:
wherein a, b and c are constant terms, and the specific determination formula is as follows:
c＝CR×(CA+S2C-DO×CR)
from the above formula, the specific parameter required for determination is DO、CR、S2CAnd CA。
S104: according to the organic carbon content TOC, pyrolysis parameters and organic matter maturity parameter R of the source rockOAnd calculating the numerical value of the specific parameter required by the equation for the parameter A of the soluble organic chloroform asphalt.
(1) Determining the mass C of the residual organic carbon in the source rock per unit volume according to the organic carbon content TOC of the source rock and pyrolysis parametersR. In actual operation, due to the influence of the thermal evolution degree and the hydrocarbon generation and discharge process, the TOC (total organic carbon) content in the hydrocarbon source rock measured by a laboratory is actually the mass of the organic carbon remained in the hydrocarbon source rock at present, so that the mass of the organic carbon remained in the hydrocarbon source rock of unit volume can be replaced by the actually measured TOC data.
(2) According to the pyrolysis parameter S of the source rock1+S2Determination of the effective carbon mass S in kerogen pyrolysis hydrocarbons2CSince experiments conducted under certain conditions with a large number of modern deposits determine that the typical percentage of carbon in hydrocarbons is 83%, 0.083 can be considered to be a coefficient converted from the amount of hydrocarbon (mg/g) to carbon (%), with the specific formula:
S2C＝(S1+S2)×0.083
(3) determining the mass C of organic carbon in the residual soluble organic matters of the hydrocarbon source rock according to the chloroform asphalt A of the soluble organic matters and the light hydrocarbon compensation coefficients of different types of hydrocarbon source rocks pyrolyzed in each thermal evolution stageA。
The light hydrocarbon compensation coefficients of the source rock are shown in table 2.
Table 2:
| phases | Stage of low maturity | Stage of maturation | High-over mature stage |
| Type I | 0.38～0.77 | 0.19～0.23 | 0.27～0.72 |
| Type II | 0.08～0.11 | 0.12～0.14 | 0.21～0.70 |
| Type III | 0.33～0.35 | 0.26～0.27 | 0.37～0.87 |
(4) According to the residual degradation rate D of the source rockTSetting a plot of organic matter degradation rate and maximum pyrolysis peak temperature in a certain area, and comprehensively determining original organic matter degradation rate D, wherein HI is a secondary ordinate, Tmax is a primary abscissa, Ro is a secondary abscissa, and HI is a pyrolysis parameter, HI is a secondary ordinate, Tmax is a maximum pyrolysis peak temperature, and Ro is a secondary abscissaOAs shown in fig. 3.
S105: calculating the hydrocarbon discharge efficiency K of the hydrocarbon source rock according to the established quadratic equationP。
C determined in steps S101-S104R、CA、S2C、DOValue and K calculated by a quadratic equation of unityPThe values are shown in Table 3.
Table 3:
in this embodiment, according to the measured data and logging data of the core, the longitudinal hydrocarbon-draining interval of the continental facies hydrocarbon source rock stratum system with strong heterogeneity is identified and determined, establishing a correlation among the organic carbon content TOC, the pyrolysis parameter, the organic matter maturity parameter Ro, the soluble organic matter chloroform bitumen A parameter and the kerogen type of each parameter of the hydrocarbon discharging layer section of the source rock according to a unit volume source rock organic carbon substance balance model, deducing a hydrocarbon discharge efficiency calculation equation according to the relation, calculating the hydrocarbon discharge efficiency of the hydrocarbon source rock hydrocarbon discharge layer section according to actually required parameters, avoiding the simulation of a complex hydrocarbon generation and discharge process, converting the geological process of hydrocarbon source rock hydrocarbon generation and discharge into a mathematical reasoning process, achieving the technical effect of quantitatively evaluating the hydrocarbon source rock hydrocarbon discharge efficiency, providing a feasible technical method for oil and gas resource evaluation, and improving the oil and gas basin resource content and the reliability of exploration potential evaluation.
Based on the same inventive concept, the embodiment of the present invention further provides a device for determining the hydrocarbon discharging efficiency of the hydrocarbon source rock, as described in the following embodiment. Because the principle of solving the problems of the device for determining the hydrocarbon discharging efficiency of the hydrocarbon source rock is similar to the method for determining the hydrocarbon discharging efficiency of the hydrocarbon source rock, the implementation of the device for determining the hydrocarbon discharging efficiency of the hydrocarbon source rock can be implemented by referring to the method for determining the hydrocarbon discharging efficiency of the hydrocarbon source rock, and repeated parts are not described again. As used hereinafter, the term "unit" or "module" may be a combination of software and/or hardware that implements a predetermined function. Although the means described in the embodiments below are preferably implemented in software, an implementation in hardware, or a combination of software and hardware is also possible and contemplated. Fig. 4 is a block diagram of a configuration of an apparatus for determining hydrocarbon discharging efficiency of a source rock according to an embodiment of the present invention, as shown in fig. 4, which may include: the system comprises a hydrocarbon discharging stratum section identification module 401, a parameter relational model establishing module 402, a hydrocarbon discharging efficiency equation solving parameter determining module 403, a solving parameter calculating module 404 and a hydrocarbon discharging efficiency determining module 405, and the structure is explained below.
Hydrocarbon drainage interval identification module 401: the method can be used for identifying and determining the longitudinal hydrocarbon drainage interval of the continental facies hydrocarbon source rock stratum system with strong heterogeneity according to the actual measurement data and the logging data of the rock core;
parametric relational model building module 402: the method can be used for establishing the correlation among the parameters of the organic carbon content of the hydrocarbon discharging layer section of the hydrocarbon source rock, the organic matter degradation rate, the organic carbon mass in the original hydrocarbon production potential of kerogen, the effective carbon mass in the pyrolysis hydrocarbon of the kerogen and the hydrocarbon discharging efficiency according to the organic carbon matter balance model of the hydrocarbon source rock in unit volume; the specific relationship includes the following:
CO＝CR+CP
CG＝CP+CA
SOC＝CG+S2C
wherein, CORepresenting the original total organic carbon of the source rock, mg/g; cGRepresenting the organic carbon in the hydrocarbon product accumulated in the hydrocarbon source rock, mg/g; cPRepresenting organic carbon in the hydrocarbon source rock hydrocarbon discharging product, mg/g; cRRepresents the residual organic carbon in the unit volume of the source rock, mg/g; cAThe carbon content of the residual soluble organic matter of the hydrocarbon source rock is expressed as mg/g; dORepresents the original degradation rate,%; dTIndicates the residual degradation rate of organic matter,%; sOCRepresenting the mass of organic carbon in the original hydrocarbon production potential of kerogen, mg/g; s2CRepresents the effective carbon mass in the kerogen pyrolysis hydrocarbon, mg/g; kPRepresents the efficiency of hydrocarbon removal,%.
The hydrocarbon discharge efficiency equation solution parameter determination module 403: the method can be used for deducing a quadratic equation of a first order related to the hydrocarbon discharge efficiency according to the correlation among the parameters and determining specific parameters required for solving the equation;
determining the following quadratic equation according to the correlation among the parameters:
wherein a, b and c are constant terms, and the specific determination formula is as follows:
c＝CR×(CA+S2C-DO×CR)
from the above formula, the specific parameter required for determination is DO、CR、S2CAnd CA。
Solution parameter calculation module 404: the method can be used for calculating the numerical values of specific parameters required by an equation according to the organic carbon content TOC of the source rock, pyrolysis parameters, organic matter maturity parameters RO and soluble organic matter chloroform asphalt 'A' parameters.
The solving parameter calculating module 404 includes a residual organic carbon mass determining unit, a pyrolytic hydrocarbon effective carbon mass determining unit, a residual soluble organic matter organic carbon mass determining unit, and an original degradation rate determining unit.
Residual organic carbon quality determination unit:can be used for determining the mass C of the residual organic carbon in the source rock per unit volume according to the organic carbon content TOC of the source rock and pyrolysis parametersR(ii) a The method specifically comprises the following steps: in actual operation, under the influence of thermal evolution degree and hydrocarbon generation and discharge processes, the TOC (total organic carbon) content in the source rock measured by a laboratory is the mass of the organic carbon remained in the source rock at present, so that the TOC data is actually measured to replace the mass of the organic carbon remained in the source rock in unit volume.
A pyrolysis hydrocarbon available carbon mass determination unit: can be used according to the pyrolysis parameter S of the hydrocarbon source rock1+S2Determination of the effective carbon mass S in kerogen pyrolysis hydrocarbons2CThe concrete formula is as follows:
S2C＝(S1+S2)×0.083。
the organic carbon mass determination unit in the residual soluble organic matter: can be used for determining the organic carbon mass C in the residual soluble organic matters of the hydrocarbon source rocks according to the soluble organic matter chloroform bitumen A and the light hydrocarbon compensation coefficients of the pyrolysis of different types of hydrocarbon source rocks in each thermal evolution stageA。
An original degradation rate determination unit: can be used for the degradation rate D according to the residual hydrocarbon source rockTSetting a plot of organic matter degradation rate and maximum pyrolysis peak temperature in a certain area, and comprehensively determining original organic matter degradation rate D, wherein HI is a secondary ordinate, Tmax is a primary abscissa, Ro is a secondary abscissa, and HI is a pyrolysis parameter, HI is a secondary ordinate, Tmax is a maximum pyrolysis peak temperature, and Ro is a secondary abscissaO。
The hydrocarbon discharge efficiency determination module 405: can be used for calculating the hydrocarbon discharging efficiency K of the hydrocarbon source rock according to the established quadratic equationP。
In a preferred embodiment, a software is also provided, and the software is used for executing the technical solutions described in the above embodiments and preferred embodiments.
In a preferred embodiment, there is also provided a storage medium having the software stored therein, the storage medium including but not limited to: optical disks, floppy disks, hard disks, erasable memory, etc.
From the above description, it can be seen that the embodiments of the present invention achieve the following technical effects: according to the measured information and the logging information of the rock core, identifying and determining the longitudinal hydrocarbon drainage layer section of the continental facies hydrocarbon source rock layer system with strong heterogeneity, establishing the correlation among the parameters of the organic carbon content TOC, the pyrolysis parameter, the organic matter maturity parameter Ro, the soluble organic matter chloroform bitumen 'A' parameter and the kerogen type of the hydrocarbon source rock drainage layer section according to the unit volume hydrocarbon source rock organic carbon matter balance model, deducing a hydrocarbon drainage efficiency calculation equation according to the correlation, and calculating the hydrocarbon drainage efficiency of the hydrocarbon source rock drainage layer section according to the actually required parameters. The technical scheme provided by the embodiment of the invention avoids the simulation of a complex hydrocarbon generation and expulsion process, converts the geological process of hydrocarbon source rock hydrocarbon generation and expulsion into a mathematical reasoning process, has the advantages of simple and visual principle, easy acquisition of calculation parameters and visual and accurate calculation result, achieves the technical effect of quantitatively evaluating the hydrocarbon source rock hydrocarbon expulsion efficiency, provides a feasible technical method for oil and gas resource evaluation, improves the credibility of the oil and gas basin resource amount and exploration potential evaluation, and has wide applicability.
Although the present invention provides method steps as described in the examples or flowcharts, more or fewer steps may be included based on conventional or non-inventive means. The order of steps recited in the embodiments is merely one manner of performing the steps in a multitude of orders and does not represent the only order of execution. When an actual apparatus or end product executes, it may execute sequentially or in parallel (e.g., parallel processors or multi-threaded environments, or even distributed data processing environments) according to the method shown in the embodiment or the figures. The terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, the presence of additional identical or equivalent elements in a process, method, article, or apparatus that comprises the recited elements is not excluded.
The units, devices, modules, etc. set forth in the above embodiments may be implemented by a computer chip or an entity, or by a product with certain functions. For convenience of description, the above devices are described as being divided into various modules by functions, and are described separately. Of course, in implementing the present invention, the functions of each module may be implemented in one or more software and/or hardware, or the modules implementing the same functions may be implemented by a combination of a plurality of sub-modules or sub-units, and the like. The above-described embodiments of the apparatus are merely illustrative, and for example, the division of the units is only one logical division, and other divisions may be realized in practice, for example, a plurality of units or components may be combined or integrated into another system, or some features may be omitted, or not executed. In addition, the shown or discussed mutual coupling or direct coupling or communication connection may be an indirect coupling or communication connection through some interfaces, devices or units, and may be in an electrical, mechanical or other form.
Those skilled in the art will also appreciate that, in addition to implementing the controller as pure computer readable program code, the same functionality can be implemented by logically programming method steps such that the controller is in the form of logic gates, switches, application specific integrated circuits, programmable logic controllers, embedded microcontrollers and the like. Such a controller may therefore be considered as a hardware component, and the means included therein for performing the various functions may also be considered as a structure within the hardware component. Or even means for performing the functions may be regarded as being both a software module for performing the method and a structure within a hardware component.
The invention may be described in the general context of computer-executable instructions, such as program modules, being executed by a computer. Generally, program modules include routines, programs, objects, components, data structures, classes, etc. that perform particular tasks or implement particular abstract data types. The invention may also be practiced in distributed computing environments where tasks are performed by remote processing devices that are linked through a communications network. In a distributed computing environment, program modules may be located in both local and remote computer storage media including memory storage devices.
From the above description of the embodiments, it is clear to those skilled in the art that the present invention can be implemented by software plus necessary general hardware platform. Based on such understanding, the technical solutions of the present invention may be embodied in the form of a software product, which may be stored in a storage medium, such as a ROM/RAM, a magnetic disk, an optical disk, or the like, and includes several instructions for enabling a computer device (which may be a personal computer, a mobile terminal, a server, or a network device) to execute the method according to the embodiments or some parts of the embodiments.
The embodiments in the present specification are described in a progressive manner, and the same or similar parts among the embodiments are referred to each other, and each embodiment focuses on the differences from the other embodiments. The invention is operational with numerous general purpose or special purpose computing system environments or configurations. For example: personal computers, server computers, hand-held or portable devices, tablet-type devices, multiprocessor systems, microprocessor-based systems, set top boxes, programmable electronic devices, network PCs, minicomputers, mainframe computers, distributed computing environments that include any of the above systems or devices, and the like.
While the present invention has been described with respect to the embodiments, those skilled in the art will appreciate that there are numerous variations and permutations of the present invention without departing from the spirit of the invention, and it is intended that the appended claims cover such variations and modifications as fall within the true spirit of the invention.
Claims (10)
1. A method of determining hydrocarbon-removal efficiency of a source rock, comprising the steps of:
identifying and determining a longitudinal hydrocarbon drainage interval of a continental-phase hydrocarbon source rock stratum system with strong heterogeneity according to actual measurement data and logging data of a rock core;
establishing a correlation among parameters of the content of organic carbon in a hydrocarbon discharging stratum section of the source rock, the degradation rate of organic matters, the mass of organic carbon in the original hydrocarbon production potential of kerogen, the mass of effective carbon in the pyrolysis hydrocarbon of the kerogen and the hydrocarbon discharging efficiency according to a unit volume source rock organic carbon substance balance model;
deducing a quadratic equation of a first order related to the hydrocarbon discharge efficiency according to the correlation among the parameters, and determining specific parameters required for solving the equation;
fourthly, according to the organic carbon content TOC, the pyrolysis parameter and the organic matter maturity parameter R of the source rockOCalculating the numerical value of a specific parameter required by an equation of the parameter A of the soluble organic chloroform asphalt;
step five, calculating the hydrocarbon discharging efficiency K of the hydrocarbon source rock according to the established quadratic equationP。
2. The determination method according to claim 1, characterized in that: the pyrolysis parameters include hydrocarbon generation potential S1+S2Hydrogen index HI, maximum pyrolysis peak temperature Tmax and residual degradation rate DT。
3. The determination method according to claim 1, characterized in that: establishing the correlation of each parameter part according to the organic carbon substance balance model of the source rock in unit volume, wherein the concrete relation comprises the following steps:
CO＝CR+CP
CG＝CP+CA
SOC＝CG+S2C
wherein, CORepresenting the original total organic carbon of the source rock, mg/g; cGRepresenting the organic carbon in the hydrocarbon product accumulated in the hydrocarbon source rock, mg/g; cPRepresenting organic carbon in the hydrocarbon source rock hydrocarbon discharging product, mg/g; cRRepresenting residual organic carbon in the source rock, mg/g; cAThe carbon content of the residual soluble organic matter of the hydrocarbon source rock is expressed as mg/g; dORepresents the original degradation rate,%; dTIndicates the residual degradation rate of organic matter,%; sOCRepresenting the mass of organic carbon in the original hydrocarbon production potential of kerogen, mg/g; s2CRepresents the effective carbon mass in the kerogen pyrolysis hydrocarbon, mg/g; kPRepresents the efficiency of hydrocarbon removal,%.
4. The determination method according to claim 1 or 3, characterized in that: and deducing a quadratic equation of a unary about the hydrocarbon discharge efficiency according to the correlation among the parameters, wherein the method for determining the specific parameters required for solving the equation comprises the following steps:
determining the following quadratic equation according to the correlation among the parameters:
wherein a, b and c are constant terms, and the specific determination formula is as follows:
c＝CR×(CA+S2C-DO×CR)
from the above formula, the specific parameter required for determination is DO、CR、S2CAnd CA。
5. The determination method according to claim 4, characterized in that: determining the mass C of residual organic carbon in unit volume of source rock according to the organic carbon content TOC of the source rockR(ii) a The method specifically comprises the following steps: in actual operation, under the influence of thermal evolution degree and hydrocarbon generation and discharge processes, the TOC (total organic carbon) content in the source rock measured by a laboratory is the mass of the organic carbon remained in the source rock at present, so that the TOC data is actually measured to replace the mass of the organic carbon remained in the source rock in unit volume.
6. The determination method according to claim 4, characterized in that: according to the pyrolysis parameter S of the source rock1+S2Determination of the effective carbon mass S in kerogen pyrolysis hydrocarbons2CThe concrete formula is as follows:
S2C＝(S1+S2)×0.083。
7. the determination method according to claim 4, characterized in that: determining the mass C of organic carbon in the residual soluble organic matters of the hydrocarbon source rock according to the chloroform asphalt A of the soluble organic matters and the light hydrocarbon compensation coefficients of different types of hydrocarbon source rocks pyrolyzed in each thermal evolution stageA。
8. The determination method according to claim 4, characterized in that: according to the residual degradation rate D of the source rockTAs a primary ordinate, the pyrolysis parameter hydrogen index HI as a secondary ordinate, and the maximum pyrolysis peak temperature Tmax asEstablishing a graph of organic matter degradation rate and maximum pyrolysis peak temperature in a certain area by taking Ro as a secondary abscissa, and comprehensively determining original organic matter degradation rate DO。
9. An apparatus for determining the hydrocarbon-removal efficiency of a source rock, the apparatus comprising:
the hydrocarbon drainage layer section identification module is used for identifying and determining the longitudinal hydrocarbon drainage layer section of the strong heterogeneous continental facies hydrocarbon source rock stratum system according to the actual measurement data and the logging data of the rock core;
the parameter relational model establishing module is used for establishing the correlation among the parameters of the organic carbon content, the organic matter degradation rate, the kerogen organic carbon mass, the kerogen effective carbon mass and the hydrocarbon discharging efficiency of the hydrocarbon discharging layer section of the source rock according to the unit volume organic carbon matter balance model of the source rock;
the hydrocarbon discharge efficiency equation solving parameter determining module is used for deducing a quadratic equation of unitary related to hydrocarbon discharge efficiency according to the correlation among the parameters and determining specific parameters required by equation solving;
the solution parameter calculation module is used for calculating the numerical values of specific parameters required by the equation according to the organic carbon content TOC of the source rock, the pyrolysis parameters, the organic matter maturity parameter RO and the soluble organic matter chloroform asphalt 'A' parameter;
a hydrocarbon discharge efficiency determination module used for calculating hydrocarbon discharge efficiency K of the source rock according to the established quadratic equationP。
10. An apparatus for determining hydrocarbon expulsion efficiency from a source rock comprising a processor and a memory storing processor-executable instructions that, when executed by the processor, effect:
identifying and determining a longitudinal hydrocarbon drainage interval of a continental facies hydrocarbon source rock stratum system with strong heterogeneity according to the actually measured information and the logging information of the rock core;
establishing a correlation among parameters of the content of organic carbon, the degradation rate of organic matters, the quality of organic carbon of kerogen, the quality of available carbon of kerogen and the hydrocarbon discharge efficiency of the hydrocarbon discharge stratum section of the hydrocarbon source rock according to a unit volume hydrocarbon source rock organic carbon matter balance model;
deducing a quadratic equation of a first order related to the hydrocarbon discharge efficiency according to the correlation among the parameters, and determining specific parameters required by equation solving;
calculating the numerical value of specific parameters required by an equation according to the organic carbon content TOC of the source rock, the pyrolysis parameters, the organic matter maturity parameter RO and the soluble organic matter chloroform asphalt 'A' parameter;
calculating the hydrocarbon discharge efficiency K of the hydrocarbon source rock according to the established quadratic equationP。
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