CN110826936B - Shale oil and gas resource grading evaluation method - Google Patents
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Abstract
The invention discloses a shale oil and gas resource grading evaluation method, which comprises the following steps: a) selecting the parameter indexes of the oil-gas production condition and the reservoir condition; b) determining the parameter index range of the crude oil gas condition; c) establishing a crude oil gas condition discrimination function according to the value range of the crude oil gas condition; d) determining a range of a parameter index of a reservoir condition; e) establishing a storage condition discrimination function according to the value range of the storage condition; f) judging the oil gas generation condition; g) determination of reservoir conditions; h) resource ranking. The shale oil and gas resource grading evaluation method provided by the invention overcomes the defects and defects existing in the existing shale oil and gas resource grading evaluation method, provides a feasible identification method for shale oil and gas resource grading, can effectively avoid misjudgment in the shale oil and gas resource development process, avoids waste of manpower and material resources, saves the exploration cost of shale oil and gas resources, has obvious beneficial effects, and is suitable for application and popularization.
Description
Technical Field
The invention relates to a shale oil and gas resource grading evaluation method, in particular to a shale oil and gas resource grading evaluation method by establishing and solving a crude oil and gas condition discrimination function and a storage condition discrimination function.
Background
Shale oil and gas resources are different from conventional oil and gas resources. Conventional hydrocarbon resources are hydrocarbons produced in hydrocarbon source rocks that have traveled long distances and have accumulated into reservoirs. Shale oil and gas is an oil and gas resource in shale layers of source rock, and is characterized in that the source rock and a reservoir layer are on the same layer. The traditional petroleum geology view only recognizes that the source rock can produce oil and gas, does not recognize that the source rock can store oil and gas, and further does not recognize that industrial petroleum (shale oil) and natural gas (shale gas) can be gathered. The successful development of the shale oil and gas resources in the United states changes the traditional knowledge on the development of the oil and gas resources and establishes the important position of shale oil and gas in an energy structure.
Successful exploitation of shale oil and gas resources depends on geological evaluation of the shale oil and gas resources. Organic matters in the rock stratum are the material basis for generating oil gas, and can be generated into effective hydrocarbon source rock when the organic matter content in the rock stratum reaches a certain degree, so that the effective hydrocarbon source rock becomes oil gas resources with development value. Thus, mass-distributed, moderately mature, organic-rich shale provides the material basis for shale oil and gas reserves. However, because the shale has low matrix porosity, small throat radius, poor pore connectivity and low permeability, the shale has poor capability of bearing oil and gas, and the interlayer or the rock stratum with developed cracks with relatively good permeability can become the shale oil and gas reservoir with development value.
The shale oil and gas resource reservoir geological condition evaluation mainly comprises oil and gas production conditions and reservoir conditions. The main parameter indices for the green oil conditions are: effective thickness of source rock, Organic Carbon content (TOC), Organic matter type, Organic matter thermal evolution degree, chloroform bitumen 'A', and pyrolysis parameter S 1 (free hydrocarbon content), oil and gas saturation, etc. The main parameters of reservoir conditions are: porosity, development degree of cracks in a reservoir, brittle mineral content of rock stratum, formation pressure coefficient, burial depth of hydrocarbon source rock, crude oil density, crude oil viscosity, micro-pore composition, shale Poisson's ratio and the like. The previous research mainly evaluates the hydrocarbon source rock from a single oil-gas production condition and a single storage condition so as to judge the development prospect of the shale oil-gas resource.
Effective thickness of the source rock. Shale oil and gas has the characteristic of short-distance migration, and is easy to enrich and collect in a thicker reservoir. The greater the thickness of the shale rich in organic matter, the stronger the hydrocarbon-producing ability of the shale, and the higher the enrichment degree of the shale hydrocarbon reservoir. Therefore, the hydrocarbon source rock with a wide area distribution and a certain thickness lays a material foundation for shale oil formation. Previous researches show that the effective thickness of the hydrocarbon source rock in the enrichment region is more than 10m, and the effective thickness of the hydrocarbon source rock in the forceful region is more than 2 m.
The organic carbon content, also called organic matter abundance, determines the hydrocarbon-producing capability of shale, and is also one of important indexes for evaluating hydrocarbon source rocks. The higher the organic carbon content is, the greater the hydrocarbon-generating potential of the shale is, and the higher the adsorbed oil gas content is. The organic carbon content value and the oil gas adsorption amount are in a positive correlation relationship, the hydrocarbon retention amount of the shale is influenced, the order of magnitude of the oil gas adsorption amount in the shale can be changed, and the development effect of the shale oil-gas reservoir is finally influenced. A TOC value greater than 2% is generally considered to be a well developed source rock, and a TOC value greater than 4% results in a significant increase in shale oil and gas production. However, due to the difference between the organic carbon content and the residual organic carbon content, the TOC value of more than 1.0% in the high-evolution area is considered to be the effective shale. Previous studies show that the TOC value of the enrichment zone is greater than 2%, and the TOC value of the active zone is: 1.0-2.0%.
The organic matter type. The organic matter types of the hydrocarbon source rocks are divided into 3 types, namely I type, II type and III type, and whether the shale is oil-producing rock or gas-producing rock can be judged according to the organic matter types. The I type is rich in hydrogen, has low oxygen content and is easy to generate oil; type II kerogen is rich in hydrogen and low in carbon content, and can generate oil or gas after being heated continuously and matured. The III type has lower hydrogen content and higher oxygen content than the I type and the II type, and is easy to generate dry gas.
The degree of thermal evolution of organic matter. The thermal evolution degree of the organic matter is used for evaluating whether the organic matter of the hydrocarbon source rock enters a thermal maturation gas generation stage (a gas generation window). If organic matter enters the raw oil gas window, the raw oil gas is increased dramatically, and a shale oil and gas reservoir beneficial to commercial development value can be formed. Vitrinite Reflectance (Ro) is an important index for measuring the maturity of organic matters. Previous research shows that when Ro is 0.5%, organic matters enter an oil gas generation threshold; when Ro is 0.7-1.3%, the hydrocarbon source rock mainly generates liquid hydrocarbons and moisture; when Ro is more than 1.3%, the hydrocarbon generated by the hydrocarbon source rock is mainly dry gas.
Chloroform bitumen "A". Chloroform Pitch "A" is the soluble organic matter content soluble in chloroform, also measuredThe shale oil gas represents the index of the abundance of the organic matter. The previous research shows that the content of the chloroform asphalt A is not only in a certain correlation with the TOC value, but also in a certain correlation with the Ro value. Since chloroform bitumen "A" does not reflect C 14－ The observed hydrocarbon content is lower than the actual residual petroleum content. When the shale oil and gas reservoir is evaluated, the combined use effect of the chloroform bitumen A and other parameter indexes is better.
Pyrolysis parameter S 1 . The pyrolysis parameter S is because organic carbon cannot thermally pyrolyze hydrocarbon-producing carbon, and the TOC content does not absolutely reflect the hydrocarbon-producing potential of shale oil gas 1 And also as a measure of shale oil and gas content.
The oil and gas saturation. The organic-rich shale has the characteristics of high oil-gas saturation and ultralow water content. This is because the organic shale is the reservoir which is saturated with hydrocarbons first in the hydrocarbon production and drainage process, and the hydrocarbons are affected by overpressure and molecular force and high temperature to displace free water and partial bound water in the hydrocarbons as much as possible, so that the hydrocarbon saturation is generally relatively high.
Porosity of the material. The porosity is the main reservoir space of shale oil and gas, the porosity is an important parameter in the research of shale oil and gas reservoirs, and the content of free oil and gas is determined by the value of the porosity. The porosity and the total content of shale gas are in a positive correlation, and the larger the porosity is, the stronger the gas storage capacity is. In addition, the larger the porosity, the better the permeability, and the oil gas is easy to flow in the reservoir, which is beneficial to development. Previous studies have shown that the porosity of the enrichment zone: 4-15%; porosity of the active zone: 2-5%.
The extent of crack development in the reservoir. The development degree of an interlayer or a crack in a reservoir affects the oil and gas content in the reservoir, the crack is not only an effective migration channel of oil and gas, but also a main influence factor of the fracturing development effect of the reservoir, and is an important condition for judging whether the shale oil and gas has industrial productivity. Previous researches suggest that the interlayer or the crack can be an enrichment area for shale oil and gas exploration and development, but specific quantitative indexes are not provided.
Brittle mineral content. Due to the low permeability of the shale reservoir matrix, fracturing is required to create enough fractures to generate industrial capacity. The brittle mineral content of the reservoir stratum is an important factor influencing fracturing, the more the brittle minerals such as quartz, feldspar and calcite in the reservoir stratum are, the lower the clay mineral content is, the stronger the rock brittleness is, cracks are easy to form under the action of external force, and the more the shale oil is beneficial to exploitation. Previous studies have shown that the brittle mineral content of the enrichment zone: 40-60%; brittle mineral content of the energetic zone: 20-39%.
The formation pressure coefficient. The stratum pressure can improve the gathering efficiency of the oil-gas reservoir, provide enough energy for the oil-gas reservoir and be beneficial to the high and stable yield of the oil-gas reservoir. Shale oil and gas has poor reservoir physical properties, and higher reservoir pressure is beneficial to improving oil and gas yield. Previous studies show that the formation pressure coefficient of the enrichment zone: 1.1 to 2.0; formation pressure coefficient of the active zone: 0.6 to 1.0.
The burial depth of the source rock. Although the burial depth of the shale oil and gas reservoir is not a determining factor of the development of the shale oil and gas reservoir, excessive burial depth can increase the difficulty of exploration and development and influence the development cost of the shale oil and gas, so that whether the shale oil and gas reservoir has commercial development value is also determined. The existing development technology is considered that the effective development depth is within 3500m, and an oil and gas reservoir with the depth of more than 3500m can be used as a resource potential area to be developed after the technology is mature.
Viscosity of crude oil. Crude oil viscosity is a measure of shale oil. The lower the density, viscosity and wax content of the crude oil, the higher the flowability of the shale oil and the benefit of shale oil exploitation. Previous studies have shown that crude oil densities are in the range of 0.825 to 0.870 g/cm 3 The temperature below (20 ℃) is beneficial to the exploitation.
Micro-porosity. Microscopic pore throats are widely developed in shale oil and gas reservoirs, so that storage spaces are provided for shale oil and gas, and further, the distribution of the shale oil and gas is controlled. For shale oil, based on analysis of the petroleum composition and its molecular diameter, pore throats with shale microscopic pore diameters greater than 10nm are believed to have better mobility for shale oil.
Shale poisson's ratio. The poisson ratio is the ratio of the absolute value of transverse positive strain and axial positive strain when an object is subjected to an external force. The previous research considers that the rock brittleness is a function of the Poisson ratio and is a main parameter for measuring the stress and the crack of the shale, and the Poisson ratio of the enriched shale is less than 0.25-0.35.
In conclusion, the shale oil and gas resource reservoir geological conditions mainly comprise index evaluations of two major aspects of oil production conditions and reservoir conditions. The existing shale oil and gas resource grading evaluation method mainly has 4 defects: (1) single evaluation of each index, when the evaluation indexes point inconsistent, qualitative conclusion or comparison among reservoirs cannot be given, and comprehensive evaluation is lacked; (2) the oil-gas generation condition and the storage condition are not respectively evaluated, and the guiding significance for the shale oil-gas exploration and development is limited; (3) parameters related to the shale layer system of resource evaluation are difficult to acquire in an early stage, and due to the lack of reasonable and effective parameters, the existing evaluation results are difficult to widely accept, popularize and apply; (4) the existing analysis method is lack of discrimination accuracy and poor in practicability.
Disclosure of Invention
In order to overcome the defects of the technical problems, the invention provides a shale oil and gas resource grading evaluation method by establishing and solving a crude oil and gas condition judgment function and a storage condition judgment function.
The shale oil and gas resource grading evaluation method is characterized by comprising the following steps of:
a) selecting parameter indexes, namely selecting each parameter index of oil and gas production conditions and reservoir conditions related to the shale oil and gas reservoir;
b) determining the raw oil gas condition parameter index range, and determining the value range of the enrichment area parameter index of the shale oil gas raw oil gas condition and the value range of the powerful area parameter index;
c) establishing a crude oil and gas condition discrimination function, generating a certain number of random numbers according to the value ranges of the parameter indexes of the enrichment region and the powerful region of the crude oil and gas condition, determining undetermined coefficients of the discrimination function, establishing the crude oil and gas condition discrimination function, implementing Box's M test, and calculating the misjudgment rate of the crude oil and gas condition discrimination function;
d) determining a storage condition parameter index range, determining a value range of an enrichment region parameter index of the shale oil-gas storage condition, and determining a value range of a power region parameter index;
e) establishing a storage condition discrimination function, generating a certain number of random numbers according to the value ranges of the enriched region and the forceful region parameter indexes of the storage condition, determining undetermined coefficients of the discrimination function, establishing the storage condition discrimination function, implementing Box's M test, and calculating the misjudgment rate of the storage condition discrimination function;
f) judging the oil gas production condition, namely selecting the actual measurement data related to the oil gas production condition collected by a certain rock oil gas exploration and development block, bringing the actual measurement data into the oil gas production condition judging function obtained in the step c), and judging the oil gas production condition of the shale oil gas according to the judging result;
g) judging the storage conditions, namely selecting the actual measurement data related to the storage conditions collected by a certain rock oil and gas exploration and development block, substituting the actual measurement data into the storage condition judgment function obtained in the step e), and judging the storage conditions of the shale oil and gas according to the judgment result;
h) grading resources, and comprehensively judging the oil and gas production conditions obtained in the step f) and the oil and gas storage conditions obtained in the step g) to evaluate the shale oil and gas resources in a grading manner.
The shale oil gas resource grading evaluation method comprises the steps of b) and c) that the parameter indexes of the oil gas generation conditions comprise the effective thickness of hydrocarbon source rocks, the organic carbon content TOC, the vitrinite reflectivity Ro, the organic matter type, the organic matter thermal evolution degree, the chloroform asphalt A and the pyrolysis parameter S 1 Generating a certain number of random numbers according to the parameter index value range of the enrichment region and the powerful region of the oil and gas production condition, determining undetermined coefficients of a discrimination function, and establishing a reservoir condition discrimination function; the parameter indexes of the storage condition in the steps d) and e) comprise porosity, development degree of cracks in the storage layer, rock stratum brittle mineral content, formation pressure coefficient, burial depth of hydrocarbon source rock, crude oil density, crude oil viscosity, micro-pore composition and shale Poisson's ratio, and a certain number of random parameter index value ranges of the enrichment region and the forceful region of the storage condition are generatedAnd determining undetermined coefficients of the discriminant function, and establishing a reservoir condition discriminant function. .
The shale oil and gas resource grading evaluation method comprises the steps that a crude oil and gas condition discrimination function established in the step c) comprises three parameter indexes of effective thickness, organic carbon content TOC and vitrinite reflectivity Ro of hydrocarbon source rock, and the expression of the crude oil and gas condition discrimination function is as follows:
Y A =k1*X A1 + k1*X A2 + k1*X A3 +k4 （1）
wherein, Y A Value of discrimination function for hydrocarbon gas conditions, X A1 Is the effective thickness, X, of the source rock A2 Is the organic carbon content TOC, X A3 Is the vitrinite reflectance Ro; k1, k2 and k3 are respectively weight coefficients of the effective thickness of the hydrocarbon source rock, the organic carbon content TOC and the vitrinite reflectivity Ro, and k4 is a constant to be solved of a hydrocarbon gas condition discriminant function; if YA is greater than 0, the hydrocarbon gas condition is considered as an enrichment zone, if Y is greater than 0 A If the value of (A) is less than 0, the oil-gas condition is considered as a force zone;
the effective thickness of the hydrocarbon source rock in the enrichment area ranges from 10m to 50m, and the effective thickness of the hydrocarbon source rock in the forceful area ranges from 6 m to 45 m; the value range of the organic carbon content TOC in the enrichment area is 2-20%, and the value range of the organic carbon content TOC in the powerful area is 1.0-2.0%; the value range of the vitrinite reflectivity Ro of the enrichment area is 0.6-1.2%, and the value range of the vitrinite reflectivity Ro of the powerful area is 0.5-1.3%.
The shale oil and gas resource grading evaluation method provided by the invention is characterized in that the storage condition discrimination function established in the step e) comprises three parameter indexes of porosity, brittle mineral content and formation pressure coefficient, and the expression of the storage condition discrimination function is as follows:
Y B =k5*X B1 + k6*X B2 + k7*X B3 +k8 （2）
wherein, Y B Is the value of the reservoir Condition discriminant function, X B1 Is porosity, X B2 Is a brittle mineral content, X B3 Is the formation pressure coefficient; k5, k6 and k7 are weight coefficients of porosity, brittle mineral content and formation pressure coefficient respectively, and k8 is reservoirCollecting constants to be solved of the conditional discrimination functions; if Y is B If the value of (A) is greater than 0, then the reservoir condition is considered to be enriched, if Y is B If the value of (d) is less than 0, then the reservoir condition is deemed to be a force zone;
the value range of the porosity of the enrichment area is 4-15%, and the value range of the porosity of the powerful area is 2-5%; the content of brittle minerals in the enrichment area is 40-60%, and the content of brittle minerals in the powerful area is 20-39%; the value range of the stratum pressure coefficient of the enrichment area is 1.1-2.0, and the value range of the stratum pressure coefficient of the powerful area is 0.6-1.0.
The shale oil and gas resource grading evaluation method of the invention comprises the steps that the random number of the raw oil and gas condition parameter index generated in the step c) is not less than 30 groups, and the random number of the storage condition parameter index generated in the step e) is not less than 30 groups; in step c), according to the calculation method of the discriminant equation, the values of k1, k2, k3 and k4 are respectively: 0.0380, 1.4801, 0.5621 and-11.3471, in step e), the values of k5, k6, k7 and k8 are respectively calculated according to the calculation method of the discriminant equation: 1.0613, 0.6741, 18.2714, and-54.3608; then:
the expression of the hydrocarbon generation condition discrimination function is as follows:
Y A =0.0380X A1 + 1.4801X A2 + 0.5621X A3 – 11.3471 （3）
the reservoir condition discrimination function is expressed as:
Y B =1.0613X B1 + 0.6741X B2 + 18.2714X B3 –54.3608（4）
the shale oil-gas resource grading evaluation method comprises the steps of respectively substituting measured data of oil-gas producing conditions and storage conditions of a certain rock oil-gas exploration and development block into a crude oil-gas condition judgment function and a storage condition judgment function, and calculating results of the crude oil-gas condition judgment function and the storage condition judgment function; if Y is A +Y B If the value is greater than 0, the shale oil gas resource can be judged to be an enrichment area; if Y is A +Y B Is less than 0, and Y A If the value is greater than 0, the shale oil gas resource can be judged to be a medium enrichment area; if Y is A +Y B If the value of (2) is less than 0, the shale oil and gas resource can be judged to be a competent area.
The invention has the beneficial effects that: the invention relates to a shale oil-gas resource grading evaluation method, which comprises the steps of firstly, establishing a crude oil-gas condition discrimination function according to shale oil-gas production oil-gas condition parameter indexes, and establishing a storage condition discrimination function according to storage condition parameter indexes; obtaining specific expressions of the established crude oil and gas condition discrimination function and the established storage condition discrimination function according to the values of the randomly generated crude oil and gas parameter indexes and the values of the storage parameter indexes; the method has the advantages that the measured data of the shale oil and gas exploration and development block, which is collected by a certain page of the shale oil and gas exploration and development block and related to the storage conditions, is substituted into the raw oil and gas condition judgment function and the storage condition judgment function, so that the accurate judgment result of whether the shale oil and gas exploration and development block is an enrichment area, a medium enrichment area or a force area can be given, the defects and the defects of the existing shale oil and gas resource grading evaluation method are overcome, a feasible judgment method is provided for grading the shale oil and gas resources, misjudgment in the shale oil and gas resource development process can be effectively avoided, waste of manpower and material resources is avoided, the exploration cost of the shale oil and gas resources is saved, the beneficial effect is remarkable, and the method is suitable for application and popularization.
Detailed Description
The invention aims to provide a shale oil and gas resource grading evaluation method, which discloses the influence of oil and gas production conditions and storage conditions on the oil and gas content of a shale oil and gas reservoir, replaces an actual measurement data sample with random numbers by utilizing a plurality of parameter index values of the oil and gas production conditions and the storage conditions and the value ranges of an enrichment region and an active region of the parameter index values, overcomes the main defects of the existing shale oil and gas resource grading evaluation method, and provides technical support for shale oil and gas resources. At present, reports on the aspect of graded evaluation of shale oil and gas resources by establishing a discriminant function by replacing actual measurement data samples with random numbers according to index value ranges of crude oil conditions and storage conditions at home and abroad are not seen.
The shale oil and gas resource grading evaluation method is realized by the following steps:
a) selecting parameter indexes, namely selecting each parameter index of oil and gas production conditions and reservoir conditions related to the shale oil and gas reservoir;
b) determining the raw oil gas condition parameter index range, and determining the value range of the enrichment area parameter index of the shale oil gas raw oil gas condition and the value range of the powerful area parameter index;
in the step, the parameter indexes of the oil and gas generation condition comprise the effective thickness of the hydrocarbon source rock, the organic carbon content TOC, the vitrinite reflectivity Ro, the organic matter type, the organic matter thermal evolution degree, the chloroform asphalt A and the pyrolysis parameter S 1 And oil and gas saturation, generating a certain number of random numbers according to the parameter index value range of the enrichment area and the powerful area of the oil and gas production condition, determining the undetermined coefficient of the discrimination function, and establishing a storage condition discrimination function. The 3 parameters are considered indispensable in the previous research, and the value range of an enrichment region and an active region is defined.
The effective thickness of the hydrocarbon source rock in the enrichment area ranges from 10m to 50m, and the effective thickness of the hydrocarbon source rock in the forceful area ranges from 6 m to 45 m; the value range of the organic carbon content TOC in the enrichment area is 2-20%, and the value range of the organic carbon content TOC in the powerful area is 1.0-2.0%; the value range of the vitrinite reflectivity Ro of the enrichment region is 0.6-1.2%, and the value range of the vitrinite reflectivity Ro of the powerful region is 0.5-1.3%.
c) Establishing a crude oil and gas condition discrimination function, generating a certain number of random numbers according to the value ranges of the parameter indexes of the enrichment region and the powerful region of the crude oil and gas condition, determining undetermined coefficients of the discrimination function, establishing the crude oil and gas condition discrimination function, implementing Box's M test, and calculating the misjudgment rate of the crude oil and gas condition discrimination function;
in the step, the established crude oil and gas condition discrimination function comprises three parameter indexes of effective thickness, organic carbon content TOC and vitrinite reflectivity Ro of the hydrocarbon source rock, and the expression of the crude oil and gas condition discrimination function is as follows:
Y A =k1*X A1 + k1*X A2 + k1*X A3 +k4 （1）
wherein, Y A Value of discrimination function for hydrocarbon gas conditions, X A1 Is the effective thickness, X, of the source rock A2 Is the organic carbon content TOC, X A3 Is the vitrinite reflectance Ro; k1,k2 and k3 are respectively weight coefficients of the effective thickness of the source rock, the organic carbon content TOC and the vitrinite reflectance Ro, and k4 is a constant to be solved of a hydrocarbon gas condition discriminant function; if YA is greater than 0, the hydrocarbon oil condition is determined to be enriched, if Y is greater than 0 A If the value of (A) is less than 0, the hydrocarbon condition is considered to be a force zone.
d) Determining a reservoir condition parameter index range, determining a value range of an enrichment region parameter index of a shale oil and gas reservoir condition, and determining a value range of a power region parameter index;
in the step, the parameter indexes of the storage condition comprise porosity, the development degree of cracks in the storage layer, the content of rock stratum brittle minerals, a formation pressure coefficient, the burial depth of hydrocarbon source rocks, the density of crude oil, the viscosity of crude oil, the composition of micro pores and the Poisson ratio of shale, a certain number of random numbers are generated according to the parameter index value range of an enrichment region and a forceful region of the storage condition, the undetermined coefficient of a discriminant function is determined, and the storage condition discriminant function is established. The 3 parameters are determined to be indispensable in previous researches, and the value ranges of an enrichment region and an active region are defined.
The value range of the porosity of the enrichment area is 4-15%, and the value range of the porosity of the powerful area is 2-5%; the content of brittle minerals in the enrichment area is 40-60%, and the content of brittle minerals in the powerful area is 20-39%; the value range of the stratum pressure coefficient of the enrichment area is 1.1-2.0, and the value range of the stratum pressure coefficient of the forceful area is 0.6-1.0.
e) Establishing a reservoir condition discrimination function, generating a certain number of random numbers according to the value ranges of the enriched region and the powerful region parameter indexes of the reservoir condition, determining undetermined coefficients of the discrimination function, establishing the reservoir condition discrimination function, implementing Box's M test, and calculating the misjudgment rate of the reservoir condition discrimination function;
in the step, the established reservoir condition discrimination function comprises three parameter indexes of porosity, brittle mineral content and formation pressure coefficient, and the expression of the reservoir condition discrimination function is as follows:
Y B =k5*X B1 + k6*X B2 + k7*X B3 +k8 （2）
wherein, Y B Is the value of the reservoir Condition discriminant function, X B1 Is porosity, X B2 Is a brittle mineral content, X B3 Is the formation pressure coefficient; k5, k6 and k7 are respectively the weight coefficients of porosity, brittle mineral content and formation pressure coefficient, and k8 is a constant to be solved of a reservoir condition discriminant function; if Y is B If the value of (A) is greater than 0, then the reservoir condition is considered to be enriched, if Y is B A value of less than 0, the reservoir condition is considered to be a force zone.
f) Judging the oil gas production condition, namely selecting the actual measurement data related to the oil gas production condition collected by a certain rock oil gas exploration and development block, bringing the actual measurement data into the oil gas production condition judgment function obtained in the step c), and judging the oil gas production condition of the shale oil gas according to the judgment result;
if Y is A If the value of (A) is greater than 0, the hydrocarbon gas condition is considered to be an enrichment zone, and if Y is greater than 0, the hydrocarbon gas condition is considered to be an enrichment zone A If the value of (b) is less than 0, the hydrocarbon gas condition is considered to be a competent zone.
g) Judging the storage conditions, namely selecting the actual measurement data related to the storage conditions collected by a certain rock oil and gas exploration and development block, substituting the actual measurement data into the storage condition judgment function obtained in the step e), and judging the storage conditions of the shale oil and gas according to the judgment result;
if Y is B If the value of (A) is greater than 0, then the reservoir condition is considered to be enriched, if Y is B A value of less than 0, the reservoir condition is considered to be a force zone.
h) Grading resources, and carrying out grading evaluation on the shale oil and gas resources by integrating the judgment result of the oil and gas production conditions obtained in the step f) and the judgment result of the storage conditions obtained in the step g).
The random number of the raw oil-gas condition parameter index generated in the step c) is not less than 30 groups, and the random number of the storage condition parameter index generated in the step e) is not less than 30 groups; in step c), according to the calculation method of the discriminant equation, the values of k1, k2, k3 and k4 are respectively: 0.0380, 1.4801, 0.5621 and-11.3471, in step e), the values of k5, k6, k7 and k8 are respectively calculated according to the calculation method of the discriminant equation: 1.0613, 0.6741, 18.2714, and-54.3608; then:
the expression of the hydrocarbon generation condition discrimination function is as follows:
Y A =0.0380X A1 + 1.4801X A2 + 0.5621X A3 – 11.3471 （3）
the reservoir condition discrimination function is expressed as:
Y B =1.0613X B1 + 0.6741X B2 + 18.2714X B3 –54.3608（4）
respectively substituting the measured data of the oil-gas producing condition and the storage condition of a certain rock oil-gas exploration and development block into a crude oil-gas condition judgment function and a storage condition judgment function, and calculating the result; if Y is A +Y B If the value of the shale oil gas resource is greater than 0, the shale oil gas resource can be judged to be an enrichment area; if Y is A +Y B Is less than 0, and Y A If the value is greater than 0, the shale oil gas resource can be judged to be a medium enrichment area; if Y is A +Y B If the value of (1) is less than 0, the shale oil and gas resource can be judged to be a force area.
Claims (2)
1. The shale oil and gas resource grading evaluation method is characterized by comprising the following steps of:
a) selecting parameter indexes, namely selecting each parameter index of oil-gas generation conditions and reservoir conditions related to shale oil-gas reservoirs;
b) determining the raw oil gas condition parameter index range, and determining the value range of the enrichment area parameter index of the shale oil gas raw oil gas condition and the value range of the powerful area parameter index;
c) establishing a crude oil and gas condition discrimination function, generating a certain number of random numbers according to the value ranges of the parameter indexes of the enrichment region and the powerful region of the crude oil and gas condition, determining undetermined coefficients of the discrimination function, establishing the crude oil and gas condition discrimination function, implementing Box's M test, and calculating the misjudgment rate of the crude oil and gas condition discrimination function;
d) determining a storage condition parameter index range, determining a value range of an enrichment region parameter index of the shale oil-gas storage condition, and determining a value range of a power region parameter index;
e) establishing a storage condition discrimination function, generating a certain number of random numbers according to the value ranges of the enriched region and the forceful region parameter indexes of the storage condition, determining undetermined coefficients of the discrimination function, establishing the storage condition discrimination function, implementing Box's M test, and calculating the misjudgment rate of the storage condition discrimination function;
f) judging the oil gas production condition, namely selecting the actual measurement data related to the oil gas production condition collected by a certain rock oil gas exploration and development block, bringing the actual measurement data into the oil gas production condition judgment function obtained in the step c), and judging the oil gas production condition of the shale oil gas according to the judgment result;
g) judging the storage conditions, namely selecting the actual measurement data related to the storage conditions collected by a certain rock oil and gas exploration and development block, substituting the actual measurement data into the storage condition judgment function obtained in the step e), and judging the storage conditions of the shale oil and gas according to the judgment result;
h) grading resources, and comprehensively judging the oil gas production conditions obtained in the step f) and the oil storage conditions obtained in the step g) to evaluate the shale oil gas resources in a grading way;
the crude oil and gas condition discrimination function established in the step c) comprises three parameter indexes of effective thickness of the hydrocarbon source rock, organic carbon content TOC and vitrinite reflectivity Ro, and the expression of the crude oil and gas condition discrimination function is as follows:
Y A =k1*X A1 + k2*X A2 + k3*X A3 +k4 （1）
wherein, Y A Value of the discrimination function for hydrocarbon gas conditions, X A1 Is the effective thickness, X, of the source rock A2 Is the organic carbon content TOC, X A3 Is the vitrinite reflectance Ro; k1, k2 and k3 are respectively weight coefficients of the effective thickness of the hydrocarbon source rock, the organic carbon content TOC and the vitrinite reflectivity Ro, and k4 is a constant to be solved of a hydrocarbon gas condition discriminant function; if Y is A If the value of (A) is greater than 0, the hydrocarbon gas condition is considered to be an enrichment zone, and if Y is greater than 0, the hydrocarbon gas condition is considered to be an enrichment zone A If the value of (A) is less than 0, the oil-gas condition is considered as a force zone;
the effective thickness of the hydrocarbon source rock in the enrichment area ranges from 10m to 50m, and the effective thickness of the hydrocarbon source rock in the forceful area ranges from 6 m to 45 m; the value range of the organic carbon content TOC in the enrichment area is 2-20%, and the value range of the organic carbon content TOC in the powerful area is 1.0-2.0%; the value range of the vitrinite reflectivity Ro of the enrichment region is 0.6-1.2%, and the value range of the vitrinite reflectivity Ro of the powerful region is 0.5-1.3%;
the reservoir condition discrimination function established in the step e) comprises three parameter indexes of porosity, brittle mineral content and formation pressure coefficient, and the expression of the reservoir condition discrimination function is as follows:
Y B =k5*X B1 + k6*X B2 + k7*X B3 +k8 （2）
wherein, Y B Is the value of the reservoir Condition discriminant function, X B1 Is porosity, X B2 Is a brittle mineral content, X B3 Is the formation pressure coefficient; k5, k6 and k7 are respectively the weight coefficients of porosity, brittle mineral content and formation pressure coefficient, and k8 is a constant to be solved of a reservoir condition discriminant function; if Y is B If the value of (A) is greater than 0, then the reservoir condition is considered to be enriched, if Y is B If the value of (d) is less than 0, then the reservoir condition is deemed to be a force zone;
the value range of the porosity of the enrichment area is 4-15%, and the value range of the porosity of the powerful area is 2-5%; the content of brittle minerals in the enrichment area is 40-60%, and the content of brittle minerals in the powerful area is 20-39%; the value range of the stratum pressure coefficient of the enrichment area is 1.1-2.0, and the value range of the stratum pressure coefficient of the forceful area is 0.6-1.0.
2. The shale oil and gas resource grading evaluation method of claim 1, characterized in that: respectively substituting the measured data of the oil-gas producing condition and the storage condition of a certain rock oil-gas exploration and development block into a crude oil-gas condition judgment function and a storage condition judgment function, and calculating the result; if Y is A +Y B If the value is greater than 0, the shale oil gas resource can be judged to be an enrichment area; if Y is A +Y B Is less than 0, and Y A If the value is greater than 0, the shale oil gas resource can be judged to be a medium enrichment area; if Y is A +Y B If the value of (1) is less than 0, the shale oil and gas resource can be judged to be a force area.
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