CN112949974A - Method for evaluating contribution rate of layered yield of composite deposition gas reservoir - Google Patents
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Abstract
The invention provides a method for evaluating the contribution rate of layered yield of a composite deposition gas reservoir, which comprises the following steps: s1, determining the main control factor of the layered gas production contribution; s2, obtaining the layered gas production contribution rate; s3, acquiring a layered energy storage coefficient: s4, establishing a relation model between the layered gas production contribution rate and the energy storage coefficient; s5, determining the gas production of the sea-facies hypotonic carbonate reservoir and the gas production of the continental-facies tight sandstone reservoir of the gas well to be evaluated. The method for evaluating the layering yield contribution rate of the land-phase compact sandstone-sea-phase low-permeability carbonate rock composite sedimentary gas reservoir solves the problem of splitting yield of multi-layer commingled gas production wells of different sedimentary systems under the conditions of strong heterogeneity of an Ordos basin reservoir, multiple wells and lack of gas production profile test data, and provides a basis for accurate evaluation of parameters such as layering yield, dynamic reserve, extraction degree, drainage range and the like of the compact sandstone reservoir and the sea-phase low-permeability carbonate rock reservoir.
Description
Technical Field
The invention belongs to the field of natural gas exploitation, and particularly relates to a method for evaluating the contribution rate of the layered yield of a composite sedimentary gas reservoir.
Background
The Ordos basin develops a plurality of gas-bearing strata, wherein the lower ancient world is a sea-phase low-permeability carbonate gas reservoir, and the upper ancient world is a land-phase compact sandstone gas reservoir. In order to implement development indexes such as gas reservoir layered productivity, dynamic reserve capacity, drainage range and the like of the upper ancient world and the lower ancient world, guide the determination of well pattern and well spacing of a gas reservoir, the division of a development layer system and the design of a mining process, and the contribution evaluation of the layered yield of a multi-layer commingled production gas well needs to be carried out. The currently common method for evaluating the yield contribution rate of the multilayer commingled gas well comprises a gas production section test method, an effective thickness method, a formation coefficient method, a numerical simulation method and the like.
The gas production profile test method is a method for measuring parameters such as fluid flow, water holding capacity, density, well temperature, pressure and the like in a shaft by using a multi-parameter combined production logging instrument and determining the layered gas production and water production conditions of a production well so as to obtain gas production contribution of each layer. The method is the most direct and reliable method for evaluating the layered yield. The Ordos basin has low gas reservoir permeability and a large number of wells, and is influenced by test cost, gas supply requirements, shaft conditions and the like, the gas field gas production section test wells have a small number (less than 3 percent) and the requirement of comprehensively and accurately evaluating the gas field small-layer gas production contribution rate is difficult to meet.
The effective thickness splitting method and the formation coefficient splitting method are methods for evaluating the contribution of the layered yield through a relation model of reservoir parameters such as the effective thickness of the formation, the formation coefficient and the like and the productivity. The method is simple to operate, and is widely applied to gas reservoirs with single deposition conditions and low microcrack development degree. For the Ordos basin land-facies tight sandstone-sea-facies low-permeability carbonate rock composite sedimentary gas reservoir, the difference of main control factors of the productivity of each layer is large, wherein the productivity and gas production contribution of the land-facies tight sandstone are mainly controlled by the effective thickness and the gas saturation of the reservoir, and the productivity and gas production contribution of the sea-facies carbonate rock gas reservoir are controlled by the effective permeability, but are influenced by the development of cracks, and the logging interpretation permeability cannot accurately reflect the real seepage capability of the reservoir. Therefore, it is difficult to achieve accurate evaluation of the contribution of the stratified gas production through the effective thickness and the formation coefficient.
The numerical simulation method is used for evaluating the layered yield contribution of the multilayer system gas reservoir through production history fitting on the basis of establishing a reservoir geological model and a numerical simulation model. The method considers the difference between reservoir conditions and production conditions, but has strong multi-solution property and complex process.
In a word, in the existing Ordos basin, the gas reservoir gas production profile test data are limited under the influence of test cost, gas supply demand, shaft conditions and the like. The theoretical methods such as an effective thickness splitting method and a formation coefficient splitting method do not consider the difference of main control factors contributing to the layered yield of the gas reservoir of different sedimentary bodies, and cannot meet the requirements of evaluating the layered yield contribution of the land-facies compact sandstone-sea-facies low-permeability carbonate rock composite sedimentary gas reservoir.
Disclosure of Invention
The invention aims to establish a method for evaluating the contribution rate of the stratified output of a composite sedimentary gas reservoir by researching main control factors of the stratified output contribution of a continental-facies tight sandstone-marine-facies low-permeability carbonate rock gas reservoir, and provides a basis for evaluation of exploitation indexes such as gas reservoir capacity and discharge range, optimization of development technical policies and numerical simulation research.
In order to achieve the purpose, the invention adopts the following technical scheme:
a method for evaluating the contribution rate of layered yield of a composite deposition gas reservoir comprises the following steps:
s1, determining main control factors of layered gas production contribution
Determining the main control factors influencing the yield splitting of the combined-layer exploitation gas well as the energy storage coefficients of the small layers according to the seepage theory;
s2, obtaining the layered gas production contribution rate
Selecting a gas well which is mined by a land-facies tight sandstone-sea-facies low-permeability carbonate rock composite sediment gas reservoir layer and has a gas production profile test result, and then obtaining gas production contribution rates of a land-facies tight sandstone reservoir and a sea-facies low-permeability carbonate rock reservoir according to gas production profile test data of the selected gas well;
s3, acquiring the layered energy storage coefficient
Respectively calculating energy storage coefficients and respective occupation ratios of a sea-facies low-permeability carbonate reservoir and a land-facies tight sandstone reservoir according to logging parameters of a land-facies tight sandstone-sea-facies low-permeability carbonate composite sedimentary gas reservoir combined layer exploitation gas well;
s4, establishing a relation model between the layered gas production contribution rate and the energy storage coefficient
Drawing a cross plot of the ratio of the energy storage coefficients of the sea phase low-permeability carbonate rock reservoir and the land phase tight sandstone reservoir and the gas production contribution rate of the sea phase low-permeability carbonate rock reservoir, and obtaining a gas production contribution rate evaluation relation model of the sea phase low-permeability carbonate rock reservoir through single-parameter regression;
s5, determining the gas yield of the sea-phase hypotonic carbonate reservoir and the gas yield of the continental-phase tight sandstone reservoir of the gas well to be evaluated
And calculating the gas production contribution rate of the sea-facies low-permeability carbonate reservoir of the gas well to be evaluated according to the gas production contribution rate evaluation relation model of the sea-facies low-permeability carbonate reservoir established in the S4 and by combining the logging parameters of the reservoir of the gas well to be evaluated, and further obtaining the gas production rate of the sea-facies low-permeability carbonate reservoir and the gas production rate of the land-facies tight sandstone reservoir of the gas well to be evaluated.
Furthermore, the step S1 of analyzing the main control factor for the contribution of the layered gas production is to determine the main control factor for the contribution of the layered production of the gas well as the energy storage coefficient of each small layer according to a reserve calculation formula and by the theoretical analysis of the contribution of the layered gas production.
Specifically, the gas production contribution rate of the S2 continental-facies tight sandstone reservoir is the sum of the gas production contribution rates of all the small strata in the continental-facies tight sandstone reservoir; the gas production contribution rate of the sea-phase low-permeability carbonate reservoir is the sum of the gas production contribution rates of all the small layers in the sea-phase low-permeability carbonate reservoir.
Specifically, the energy storage coefficient is the product of the effective thickness, the porosity and the gas saturation of the reservoir, and the calculation formula is h phi SgIn the formula, three parameters of effective thickness, porosity and gas saturation of the reservoir are explained by well loggingAnd (4) obtaining.
As a further preferable scheme, the energy storage coefficient of the sea-phase hypotonic carbonate reservoir in the S3 is the sum of the energy storage coefficients of all small layers of the sea-phase hypotonic carbonate reservoir; and the energy storage coefficient of the continental facies compact sandstone reservoir is the sum of the energy storage coefficients of all the small layers of the continental facies compact sandstone reservoir.
As a further preferable scheme, the energy storage coefficient of the sea phase hypotonic carbonate reservoir accounts for omegaCarbonate rockIs the ratio of the sum of the energy storage coefficients of all small layers of the sea phase hypotonic carbonate reservoir to the total energy storage coefficient,
namely, it is
Energy storage coefficient of continental facies tight sandstone reservoir accounts for omegaSandstoneIs the ratio of the sum of the energy storage coefficients of all small layers of the continental tight sandstone reservoir to the total energy storage coefficient, i.e.
In the formula, hjEffective reservoir thickness for layer j;
φjreservoir porosity for stratum j;
Sgjthe reservoir gas saturation at the jth layer.
As a further preferred scheme, the gas well to be evaluated S5 has a gas production contribution rate f of a marine hypotonic carbonate reservoirCThe calculation formula of (2) is as follows:
as a further preferable scheme, the gas yield of the sea-phase hypotonic carbonate reservoir of the gas well to be evaluated is the product of the gas yield contribution rate of the sea-phase hypotonic carbonate reservoir of the gas well to be evaluated and the total gas well wellhead yield.
As a further preferable scheme, the gas yield of the continental facies tight sandstone reservoir of the gas well to be evaluated is obtained by subtracting the gas yield of the marine facies hypotonic carbonate reservoir of the gas well to be evaluated from the wellhead yield of the gas well.
Due to the adoption of the technical scheme, the invention has the following beneficial effects:
1. the invention provides a split method for the layered yield of a land-facies tight sandstone-sea-facies low-permeability carbonate rock composite sediment gas reservoir on the basis of a seepage theory and on the basis of analysis of influence factors contributing to the layered yield of a multi-layer commingled production gas well. The method solves the problem of split yield of the multi-layer commingled production gas well of different sedimentation systems under the conditions of strong heterogeneity, multiple wells and lack of gas production profile test data of the Ordos basin reservoir, and provides a basis for accurate evaluation of parameters such as the layered yield, the dynamic reserve, the production degree, the drainage range and the like of the tight sandstone reservoir and the marine hypotonic carbonate reservoir.
2. For a tight sandstone-low permeability carbonate rock composite sedimentary gas reservoir gas well which is not subjected to a gas production profile test, the composite sedimentary gas reservoir layered yield contribution rate evaluator provided by the invention is adopted to calculate the layered gas production contribution rate so as to realize layered content splitting. The method is simple, convenient and applicable, can save a large amount of field test cost, and has great practical value and economic value.
The foregoing description is only an overview of the technical solutions of the present invention, and in order to clearly understand the technical solutions of the present invention and to implement the technical solutions according to the contents of the description, the following detailed description is given with reference to the preferred embodiments of the present invention and the accompanying drawings.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art that other designs and drawings can be obtained based on these drawings without creative efforts.
FIG. 1 is a multiple regression relationship diagram of gas production contribution rate of a sea phase low permeability carbonate reservoir and energy storage coefficient ratio of the sea phase low permeability carbonate reservoir and a land phase tight sandstone reservoir.
Detailed Description
The conception, the specific structure, and the technical effects produced by the present invention will be clearly and completely described below in conjunction with the embodiments and the accompanying drawings to fully understand the objects, the features, and the effects of the present invention. It should be understood, however, that the present invention may be embodied in various forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the invention to those skilled in the art.
Example 1:
the embodiment provides a method for evaluating the contribution rate of layered yield of a composite deposition gas reservoir, which comprises the following steps:
s1, determining main control factors of layered gas production contribution
Determining the main control factors influencing the yield splitting of the combined-layer exploitation gas well as the energy storage coefficients of the small layers according to the seepage theory;
s2, obtaining the layered gas production contribution rate
Selecting a gas well which is mined by a land-facies tight sandstone-sea-facies low-permeability carbonate rock composite sediment gas reservoir layer and has a gas production profile test result, and then obtaining the gas production contribution rate of a land-facies tight sandstone reservoir (hereinafter, referred to as a sandstone reservoir) and a sea-facies low-permeability carbonate reservoir (hereinafter, referred to as a carbonate reservoir) carbonate reservoir according to the gas production profile test data of the selected gas well;
s3, acquiring the layered energy storage coefficient
Respectively calculating energy storage coefficients and respective occupation ratios of a sea-facies low-permeability carbonate reservoir and a land-facies tight sandstone reservoir according to logging parameters of a land-facies tight sandstone-sea-facies low-permeability carbonate composite sedimentary gas reservoir combined layer exploitation gas well;
s4, establishing a relation model between the layered gas production contribution rate and the energy storage coefficient
Drawing a cross plot of the ratio of the energy storage coefficients of the sea phase low-permeability carbonate rock reservoir and the land phase tight sandstone reservoir and the gas production contribution rate of the sea phase low-permeability carbonate rock reservoir, and obtaining a gas production contribution rate evaluation relation model of the sea phase low-permeability carbonate rock reservoir through single-parameter regression;
s5, determining the gas yield of the sea-phase hypotonic carbonate reservoir and the gas yield of the continental-phase tight sandstone reservoir of the gas well to be evaluated
And calculating the gas production contribution rate of the sea-facies low-permeability carbonate reservoir of the gas well to be evaluated according to the gas production contribution rate evaluation relation model of the sea-facies low-permeability carbonate reservoir established in the S4 and by combining the logging parameters of the reservoir of the gas well to be evaluated, and further obtaining the gas production rate of the sea-facies low-permeability carbonate reservoir and the gas production rate of the land-facies tight sandstone reservoir of the gas well to be evaluated.
According to the invention, a composite sedimentary gas reservoir yield splitting method is established through the research of the main control factor contributing to the layered yield of the continental-facies tight sandstone-sea-facies low-permeability carbonate rock gas reservoir, and a basis is provided for the evaluation of exploitation indexes such as the gas reservoir capacity and the drainage range, the optimization of development technical policies and the numerical simulation research. For the tight sandstone-low permeability carbonate rock composite sedimentary gas reservoir gas well without carrying out gas production profile test, by the method, the layered gas production contribution rate can be obtained by utilizing the conventional well logging interpretation parameters, and further layered content splitting is realized.
Example 2:
on the basis of the example 1, further, the analysis of the main control factor contributing to the stratified gas production in the step S1 is based on the seepage basic theory and is combined with a reserve calculation formula to study the stratified production of the multilayer gas production well.
According to the well testing theory of the gas well, in the initial production stage of the gas reservoir gas well exploited in the combined layer, the layered output proportion is distributed according to the formation coefficient, and when pressure waves are spread to the boundary to form a pseudo steady flow, the contribution of the layered output is close to the reserve ratio of each layer. According to the reserve calculation formula (formula 1), the contribution rate of the layered yield is proportional to the layered energy storage coefficient
Volume coefficient of natural gas BgjAnd a discharge radius rejAnd (5) controlling.
Wherein f isjYield contribution rate for jth sublayer;
hjeffective reservoir thickness for layer j;
φjreservoir porosity for stratum j;
Sgjthe reservoir gas saturation of the jth layer;
hjφjSgjthe storage coefficient of the j-th layer.
Under the condition that the properties of a warm-pressure system and a fluid are similar, when pressure waves are transmitted to a drainage boundary, the ratio of the layered energy storage coefficients
Has a great influence on the layer yield contribution rate.
Therefore, by analyzing the layered gas production contribution theory, the main control factor of the layered yield contribution of the actual gas well is the energy storage coefficient of each small layer.
Example 3:
on the basis of the embodiment, the layered gas production contribution rate is derived from gas production profile test data of a production well of a composite bed in the tight sandstone-low-permeability carbonate rock composite sedimentary gas reservoir, specifically, for a gas well which is produced by a composite bed of the tight sandstone-sea low-permeability carbonate rock composite sedimentary gas reservoir in continental facies and has a gas production profile test result, the gas production contribution rates of each small layer of the sandstone reservoir and the carbonate rock reservoir are respectively summed, and the gas production contribution rate of the sandstone reservoir and the carbonate rock reservoir is obtained, namely the gas production contribution rate of the sandstone reservoir is the sum of the gas production contribution rates of each small layer of the sandstone reservoir; the gas production contribution rate of the carbonate reservoir is the sum of the gas production contribution rates of all the small layers in the carbonate reservoir.
It should be noted that, for gas wells with continuous multiple gas production profile test data, arithmetic mean operation is respectively performed on gas production contribution ratios of the tight sandstone reservoir and the marine hypotonic carbonate reservoir, so as to obtain gas production contribution ratios of each layer.
Example 4:
on the basis of the above embodiments, energy is storedThe coefficient is the product of effective thickness, porosity and gas saturation of reservoir, and the calculation formula is h phi SgAnd obtaining three parameters of reservoir effective thickness, porosity and gas saturation by well logging interpretation.
Therefore, as a further preferable scheme, the energy storage coefficients and the respective proportions (omega) of the sandstone reservoir and the carbonate reservoir are respectively calculated according to the gas wells which are produced by the continental-facies compact sandstone-sea-facies low-permeability carbonate rock composite sedimentary gas reservoir bed and have gas production profile testsCarbonate rock、ωSandstone) And finding out through multifactor convergent regression: the gas production contribution rate of the ancient carbonate rock reservoir and the energy storage coefficient of the carbonate rock and sandstone reservoir are multiple (omega)Carbonate rock/ωSandstone) In a logarithmic relationship, as shown in FIG. 1.
Wherein:
ωcarbonate rock-the ratio of the carbonate energy storage coefficient, the ratio of the sum of the energy storage coefficients of the small layers of the carbonate reservoir to the total energy storage coefficient;
ωsandstone-the energy storage coefficient ratio of the sandstone reservoir, the ratio of the sum of the energy storage coefficients of the small layers of the sandstone reservoir to the total energy storage coefficient;
further, a relation model of the gas production contribution rate of the carbonate reservoir and the energy storage coefficient of the carbonate reservoir is obtained through regression, and the relation model is shown as a formula (3).
Wherein the content of the first and second substances,
in the formula (f)CGas production contribution rate of the ancient carbonate reservoir;
hjeffective reservoir thickness for layer j;
φjreservoir porosity for stratum j;
Sgjthe reservoir gas saturation at the jth layer.
According to the established gas production contribution rate evaluation relation model of the carbonate reservoir, the gas production contribution rate of the carbonate reservoir of the gas well to be evaluated is calculated by combining the well logging and interpretation effective thickness, porosity and gas saturation parameters of the reservoir of the gas well to be evaluated; on the basis, the gas production contribution rate of the carbonate reservoir is multiplied by the wellhead yield of the gas well, so that the gas production rate of the carbonate reservoir of the gas well to be evaluated can be obtained; and subtracting the gas yield of the carbonate reservoir from the wellhead yield of the gas well to obtain the gas yield of the sandstone reservoir of the gas well to be evaluated.
According to the invention, a composite sedimentary gas reservoir yield splitting method is established through the research of the main control factor contributing to the layered yield of the continental-facies tight sandstone-sea-facies low-permeability carbonate rock gas reservoir, and a basis is provided for the evaluation of exploitation indexes such as the gas reservoir capacity and the drainage range, the optimization of development technical policies and the numerical simulation research.
Example 5:
the embodiment provides a method for evaluating the contribution rate of layered yield of a composite deposition gas reservoir, which comprises the following steps:
s1, analyzing main control factors of layered gas production contribution
Combining the characteristics of a continental-facies tight sandstone-sea-facies low-permeability carbonate rock composite sedimentary gas reservoir, analyzing and determining main control factors influencing the yield splitting of the combined-layer exploitation gas well as energy storage coefficients of all the small layers through a layered gas production contribution theory;
s2, obtaining the contribution rate of layered gas production
Selecting a gas well which is mined by a land-phase compact sandstone-sea-phase low-permeability carbonate rock composite sediment gas reservoir layer and has a gas production profile test result, and then summing gas production contribution rates of small layers of a sandstone reservoir and a carbonate rock reservoir respectively according to gas production profile test data of the selected gas well to obtain the gas production contribution rates of the sandstone reservoir and the carbonate rock reservoir;
s3, obtaining the layered energy storage coefficient
Calculating the energy storage coefficient (h phi S) of each small layer of the gas well produced by the land-phase tight sandstone-sea-phase low-permeability carbonate rock composite sedimentary gas reservoir composite layerg) Summing the energy storage coefficients of all small layers of the carbonate reservoir and dividing the sum by the total energy storage coefficient to obtain the energy storage coefficient ratio (omega) of the carbonate reservoirCarbonate rock) And then summing the energy storage coefficients of all the small layers of the sandstone reservoir and dividing the sum by the total energy storage coefficient to obtain the energy storage coefficient ratio (omega) of the sandstone reservoirSandstone) And dividing the two to obtain the ratio (omega) of the energy storage coefficients of the carbonate rock and the sandstone reservoirCarbonate rock/ωSandstone)；
S4, establishing a relation model of the layered gas production contribution rate and the energy storage coefficient
Drawing a cross graph of the ratio of the energy storage coefficients of the carbonate reservoir and the sandstone reservoir and the gas production contribution rate of the carbonate reservoir, and obtaining a gas production contribution rate evaluation relation model of the carbonate reservoir through single-parameter regression;
s5, determining gas production of gas well carbonate reservoir and sandstone reservoir to be evaluated
According to the gas production contribution rate evaluation relation model of the carbonate reservoir established in the S4, calculating the gas production contribution rate of the carbonate reservoir by combining the effective thickness, porosity and gas saturation parameters of the well logging interpretation of the gas well reservoir to be evaluated; on the basis, the gas production contribution rate of the carbonate reservoir is multiplied by the wellhead yield of the gas well, so that the gas production rate of the carbonate reservoir can be obtained; and subtracting the gas yield of the carbonate reservoir from the gas well wellhead yield to obtain the gas yield of the sandstone reservoir.
The method for evaluating the layered yield contribution rate of the composite sedimentary gas reservoir is applied to a Jingbian gas field, the gas production contribution of an underground ancient carbonate rock reservoir of commingled mining is evaluated for 700 surplus, and the yield split ratio of a gas well is increased from 2.6% to more than 85.2%; meanwhile, the method can save the testing cost by 210 ten thousand yuan/year (the testing cost of a single well is 5.95 ten thousand yuan per 706 mouth combined production well is converted according to the proportion of 5 percent of the testing well number of 706 mouth combined production wells).
In conclusion, the invention provides a split method of the stratified output of the land-phase compact sandstone-sea-phase low-permeability carbonate rock composite sediment gas reservoir on the basis of the seepage theory and on the basis of analysis of the influence factors of the stratified output contribution of the multi-layer commingled production gas well. The method solves the problem of split yield of the multilayer commingled production gas well of different sedimentation systems under the conditions of strong heterogeneity, multiple wells and lack of gas production profile test data of the Ordos basin reservoir, and provides a basis for accurate evaluation of parameters such as the layering yield, the dynamic reserve, the production degree, the drainage range and the like of the continental-facies compact sandstone reservoir and the sea-facies low-permeability carbonate reservoir. And the application of gas fields such as Jingbian, Yulin, Su Li Ge and the like proves that the method is simple, convenient and applicable, can save a large amount of field test cost, and has great practical value and economic value.
The foregoing is only a preferred embodiment of the present invention, and it should be noted that many other modifications and embodiments can be devised by those skilled in the art without departing from the technical principles of the present invention, which will fall within the scope and spirit of the principles disclosed herein. More specifically, various variations and modifications are possible in the component parts and/or arrangements of the subject combination arrangement within the scope of the disclosure, the drawings and the appended claims. In addition to variations and modifications in the component parts and/or arrangements, other uses will also be apparent to those skilled in the art.
Claims (10)
1. A method for evaluating the contribution rate of layered yield of a composite deposition gas reservoir is characterized by comprising the following steps:
s1, determining main control factors of layered gas production contribution
Determining the main control factors influencing the yield splitting of the combined-layer exploitation gas well as the energy storage coefficients of the small layers according to the seepage theory;
s2, obtaining the layered gas production contribution rate
Selecting a gas well which is mined by a land-phase compact sandstone-sea-phase low-permeability carbonate rock composite sediment gas reservoir layer and has a gas production profile test result on the basis of the step S1, and then obtaining the gas production contribution rate of the land-phase compact sandstone reservoir layer and the sea-phase low-permeability carbonate rock reservoir layer according to the gas production profile test result of the selected gas well;
s3, acquiring the layered energy storage coefficient
Respectively calculating the energy storage coefficients and the respective proportions of a sea-facies low-permeability carbonate reservoir and a land-facies tight sandstone reservoir according to an energy storage coefficient calculation formula;
s4, establishing a relation model between the layered gas production contribution rate and the energy storage coefficient
Drawing a cross plot of the ratio of the energy storage coefficients of the sea phase low-permeability carbonate rock reservoir and the land phase tight sandstone reservoir and the gas production contribution rate of the sea phase low-permeability carbonate rock reservoir, and obtaining a gas production contribution rate evaluation relation model of the sea phase low-permeability carbonate rock reservoir through single-parameter regression;
s5, determining the gas yield of the sea-phase hypotonic carbonate reservoir and the gas yield of the continental-phase tight sandstone reservoir of the gas well to be evaluated
And calculating the gas production contribution rate of the sea-facies low-permeability carbonate reservoir of the gas well to be evaluated according to the gas production contribution rate evaluation relation model of the sea-facies low-permeability carbonate reservoir established in the S4 and by combining the logging interpretation parameters of the reservoir of the gas well to be evaluated, and further obtaining the gas production rate of the sea-facies low-permeability carbonate reservoir and the gas production rate of the land-facies tight sandstone reservoir of the gas well to be evaluated.
2. The method as claimed in claim 1, wherein the method comprises: the gas production contribution rate of the S2 continental-facies tight sandstone reservoir is the sum of the gas production contribution rates of all the small layers in the continental-facies tight sandstone reservoir; the gas production contribution rate of the sea-phase low-permeability carbonate reservoir is the sum of the gas production contribution rates of all the small layers in the sea-phase low-permeability carbonate reservoir.
3. The method as claimed in claim 1, wherein the method comprises: the energy storage coefficient is the product of the effective thickness, the porosity and the gas saturation of the reservoir, and the calculation formula is h phi Sg。
4. The method according to claim 3, wherein the method comprises the steps of: the three parameters of the effective thickness, the porosity and the gas saturation of the reservoir in the energy storage coefficient calculation formula are obtained by well logging interpretation.
5. The method according to claim 3, wherein the method comprises the steps of: the energy storage coefficient of the sea-phase hypotonic carbonate reservoir in the S3 is the sum of the energy storage coefficients of all small layers of the sea-phase hypotonic carbonate reservoir; and the energy storage coefficient of the continental facies compact sandstone reservoir is the sum of the energy storage coefficients of all the small layers of the continental facies compact sandstone reservoir.
6. The method as claimed in claim 5, wherein the method comprises: the energy storage coefficient of the sea phase hypotonic carbonate reservoir accounts for omegaCarbonate rockIs the ratio of the sum of the energy storage coefficients of all small layers of the sea phase hypotonic carbonate reservoir to the total energy storage coefficient,
namely, it is
Energy storage coefficient of continental facies tight sandstone reservoir accounts for omegaSandstoneIs the ratio of the sum of the energy storage coefficients of all small layers of the continental tight sandstone reservoir to the total energy storage coefficient, i.e.
In the formula, hjEffective reservoir thickness for layer j;
φjreservoir porosity for stratum j;
Sgjthe reservoir gas saturation at the jth layer.
7. The method for evaluating the contribution rate of the layered production of the composite sedimentary gas reservoir according to claim 6, wherein the ratio of the energy storage coefficients of the marine hypotonic carbonate reservoir and the land tight sandstone reservoir is omegaCarbonate rock/ωSandstone。
8. The composite deposition gas of claim 7The method for evaluating the reservoir stratified production contribution rate is characterized in that the sea phase hypotonic carbonate reservoir gas production contribution rate f of the gas well to be evaluated in S5CThe calculation formula of (2) is as follows:
9. the method as claimed in claim 1, wherein the method comprises: and the gas yield of the sea-phase hypotonic carbonate reservoir of the gas well to be evaluated is the product of the gas yield contribution rate of the sea-phase hypotonic carbonate reservoir of the gas well to be evaluated and the total gas well wellhead yield.
10. The method as claimed in claim 9, wherein the method comprises: and the gas yield of the continental facies tight sandstone reservoir of the gas well to be evaluated is obtained by subtracting the gas yield of the marine facies hypotonic carbonate reservoir of the gas well to be evaluated from the wellhead yield of the gas well.
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