CN112949974B - Method for evaluating layered yield contribution rate of composite sedimentary gas reservoir - Google Patents
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Abstract
The invention provides a method for evaluating the yield contribution rate of a composite deposition gas reservoir, which comprises the following steps: s1, determining main control factors of layered gas production contribution; s2, obtaining a layered gas production contribution rate; s3, obtaining a layered energy storage coefficient: s4, establishing a relation model of the layered gas production contribution rate and the energy storage coefficient; s5, determining the sea-phase low-carburized rock reservoir gas yield and land-phase tight sandstone reservoir gas yield of the gas well to be evaluated. The evaluation method for the layered yield contribution rate of the land-phase compact sandstone-sea-phase low-carburized rock composite deposit gas reservoir solves the problem of split yield of multi-layer gas production wells of different deposit systems under the conditions of strong heterogeneity, multiple well numbers, lack of gas production profile test data of a Hummer basin reservoir, and provides a basis for accurate evaluation of parameters such as the layered yield, dynamic reserve, extraction degree, drainage range and the like of the compact sandstone and sea-phase low-carburized rock reservoir.
Description
Technical Field
The invention belongs to the field of natural gas exploitation, and particularly relates to a method for evaluating a layered yield contribution rate of a composite deposition gas reservoir.
Background
The Erdos basin develops multiple sets of gas bearing strata, wherein the lower ancient world is a sea-phase low-carburized rock gas reservoir and the upper ancient world is a land-phase tight sandstone gas reservoir. In order to implement development indexes such as the layered productivity, the dynamic reserve, the drainage range and the like of the gas reservoirs in the ancient world and the ancient world, the well pattern well spacing determination, the development layer division and the exploitation process design of the gas reservoirs are guided, and the layered production contribution evaluation of the multi-layer gas production well is required to be carried out. The conventional methods for evaluating the yield contribution rate of the multi-layer gas production well include a gas production profile test method, an effective thickness method, a stratum 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 contributions of various layers. The method is the most direct and reliable method for evaluating layering yield. The Erdos basin has low gas reservoir permeability and more wells, is influenced by test cost, gas supply requirement, shaft condition and the like, has less (less than 3%) of gas production profile test wells, and is difficult to meet the requirement of comprehensively and accurately evaluating the gas production contribution rate of the small layers of the gas field.
The effective thickness splitting method and the stratum coefficient splitting method are methods for evaluating layering yield contribution through a stratum effective thickness, stratum coefficient and other reservoir parameters and productivity relation model. The method is simple to operate, and can be widely applied to gas reservoirs with single deposition condition and low microcrack development degree. For the Hudous basin land-phase compact sandstone-sea-phase low-carburized rock composite deposition gas reservoir, the difference of production energy main control factors of each layer is large, wherein the production capacity and the gas production contribution of the land-phase compact sandstone are mainly controlled by the effective thickness and the gas saturation of a reservoir, the production capacity and the gas production contribution of the sea-phase carbonate gas reservoir are stronger in effective permeability control effect, but are influenced by crack development, and the true seepage capacity of the reservoir cannot be accurately reflected by logging interpretation permeability. Thus, it is difficult to achieve accurate assessment of the stratified gas production contribution by effective thickness and formation coefficients.
The numerical simulation method is used for evaluating the layering yield contribution of the multi-layer 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 polynary and complex process.
In short, the existing Erdos basin is influenced by test cost, air supply requirement, shaft conditions and the like, and the gas reservoir gas production profile test data is limited. The theoretical methods such as an effective thickness splitting method and formation coefficient splitting method do not consider the difference of main control factors of the gas reservoir layering yield contribution of different sedimentary bodies, and can not meet the evaluation requirement of the gas reservoir layering yield contribution of the land-phase compact sandstone-sea-phase low-carburized rock composite sediment.
Disclosure of Invention
The invention aims to establish a method for evaluating the layered yield contribution rate of a composite sedimentary gas reservoir through researching the main control factors of the layered yield contribution of the land-phase compact sandstone-sea-phase low-carburized rock gas reservoir, and provides basis for evaluating exploitation indexes such as the capacity and the drainage range of the gas reservoir, optimizing the development technical policy and researching numerical simulation.
In order to achieve the above purpose, the present invention adopts the following technical scheme:
a method for evaluating the layered yield contribution rate of a composite deposition gas reservoir comprises the following steps:
s1, determining main control factors of layered gas production contribution
Determining main control factors influencing yield splitting of the combined production gas well as energy storage coefficients of all small layers according to a seepage theory;
s2, obtaining a layered gas production contribution rate
Selecting a gas well which is mined by a land-phase compact sandstone-sea-phase low-carburized rock composite deposit gas reservoir layer and has a gas production profile test result, and then obtaining the gas production contribution rate of a land-phase compact sandstone reservoir and a sea-phase low-carburized carbonate reservoir according to the gas production profile test data of the selected gas well;
s3, obtaining a layered energy storage coefficient
According to logging parameters of a gas well produced by the composite deposition of the land-phase compact sandstone and the sea-phase low-carburized rock, respectively calculating the energy storage coefficients and the respective duty ratios of a sea-phase low-carburized rock reservoir and a land-phase compact sandstone reservoir;
s4, establishing a layered gas production contribution rate and energy storage coefficient relation model
Drawing a chart of intersection of the ratio of the energy storage coefficient ratio of the sea-phase low-carburized rock reservoir and the land-phase tight sandstone reservoir and the gas production contribution rate of the sea-phase low-carburized rock reservoir, and obtaining a gas production contribution rate evaluation relation model of the sea-phase low-carburized rock reservoir through single-parameter regression;
s5, determining the gas production of the gas well sea phase low-carburized rock reservoir and the gas production of the land phase tight sandstone reservoir to be evaluated
And according to the gas production contribution rate evaluation relation model of the sea phase low-carburized rock reservoir established in the step S4, the gas production contribution rate of the sea phase low-carburized rock reservoir of the gas well to be evaluated is calculated by combining the logging parameters of the reservoir of the gas well to be evaluated, and then the gas production rate of the sea phase low-carburized rock reservoir and the gas production rate of the land phase tight sandstone reservoir of the gas well to be evaluated are obtained.
Further, the S1 layered gas production contribution main control factor analysis is performed according to a reserve calculation formula, and the layered gas production contribution main control factors of the gas well are determined to be all small-layer energy storage coefficients through layered gas production contribution theoretical analysis.
Specifically, the gas production contribution rate of the land-phase tight sandstone reservoir in the S2 is the sum of the gas production contribution rates of all the small layers in the land-phase tight sandstone reservoir; the gas production contribution rate of the sea-phase low-carburized rock reservoir is the sum of the gas production contribution rates of all the small layers in the sea-phase low-carburized rock 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 hPhiS g The three parameters of effective thickness, porosity and gas saturation of the reservoir in the formula are obtained by well logging interpretation.
As a further preferable scheme, the energy storage coefficient of the sea-phase hypotonic carbonate reservoir in the step S3 is the sum of the energy storage coefficients of all small layers of the sea-phase hypotonic carbonate reservoir; the energy storage coefficient of the land-phase compact sandstone reservoir is the sum of the energy storage coefficients of all small layers of the land-phase compact sandstone reservoir.
As a further preferable scheme, the sea phase low-carburized rock reservoir energy storage coefficient is equal to the ratio omega Carbonate rock Is 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,
i.e.
Energy storage coefficient of land-phase compact sandstone reservoir with ratio omega Sandstone Is the ratio of the sum of the energy storage coefficients of all small layers of the continental facies compact sandstone reservoir to the total energy storage coefficient, namely
In the formula, h j A reservoir effective thickness of a j-th layer;
φ j reservoir porosity for the j-th layer;
S gj reservoir gas saturation for the j-th layer.
As a further preferable scheme, the S5 is used for evaluating the gas production contribution rate f of the sea-phase low-carburized rock reservoir of the gas well C The calculation formula of (2) is as follows:
as a further preferred scheme, the sea phase low-carburized rock reservoir gas yield of the gas well to be evaluated is the product of the sea phase low-carburized rock reservoir gas yield contribution rate of the gas well to be evaluated and the total gas well wellhead yield.
As a further preferred scheme, the land-phase tight sandstone reservoir gas yield of the gas well to be evaluated is the gas well wellhead yield minus the sea-phase low-carburized rock reservoir gas yield of the gas well to be evaluated.
By adopting the technical scheme, the invention has the following beneficial effects:
1. the invention provides a land-phase compact sandstone-sea-phase low-carburized rock composite deposition gas reservoir layered yield splitting method based on seepage theory and on analysis of influence factors of layered yield contribution of a multi-layer gas recovery well. The method solves the problem of splitting the production of the multi-layer gas production well of different deposition systems under the conditions of strong heterogeneity, more wells and lack of gas production profile test data of the reservoir of the Erdos basin, and provides a basis for accurately evaluating parameters such as the layered production, the dynamic reserve, the extraction degree, the drainage range and the like of the reservoir of compact sandstone and sea low-carburized rock.
2. For a compact sandstone-low-carburized rock composite deposition gas reservoir gas well which is not subjected to gas production profile test, the method for evaluating the layering yield contribution rate of the composite deposition gas reservoir is adopted to calculate the layering gas production contribution rate, so that layering content splitting is realized. The method is simple and convenient, is applicable, can save a great amount of field test cost, and has great practical value and economic value.
The foregoing description is only an overview of the technical solution of the present invention, and in order to make the technical means of the present invention more clearly understood, it can be implemented according to the content of the specification, and the following detailed description of the preferred embodiments of the present invention will be given with reference to the accompanying drawings.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings that are needed 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 other designs and drawings can be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a graph showing a multiple regression relationship between the gas production contribution rate of a sea-phase hypotonic carbonate reservoir and the energy storage coefficient ratio of the sea-phase low-carburized rock reservoir and a land-phase tight sandstone reservoir.
Detailed Description
The conception, specific structure, and technical effects produced by the present invention will be clearly and completely described below with reference to the embodiments and the drawings to fully understand the objects, features, and effects of the present invention. It should be understood, however, that the invention may be embodied in various forms and should not be 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 yield contribution rate of a composite deposition gas reservoir, which comprises the following steps:
s1, determining main control factors of layered gas production contribution
Determining main control factors influencing yield splitting of the combined production gas well as energy storage coefficients of all small layers according to a seepage theory;
s2, obtaining a layered gas production contribution rate
Selecting a gas well which is mined by a land-phase compact sandstone-sea-phase low-carburized rock composite deposit gas reservoir and has a gas production profile test result, and then obtaining the gas production contribution rate of a land-phase compact sandstone reservoir (hereinafter referred to as sandstone reservoir) and a sea-phase low-carburized carbonate reservoir (hereinafter referred to as carbonate reservoir) according to the gas production profile test data of the selected gas well;
s3, obtaining a layered energy storage coefficient
According to logging parameters of a gas well produced by the composite deposition of the land-phase compact sandstone and the sea-phase low-carburized rock, respectively calculating the energy storage coefficients and the respective duty ratios of a sea-phase low-carburized rock reservoir and a land-phase compact sandstone reservoir;
s4, establishing a layered gas production contribution rate and energy storage coefficient relation model
Drawing a chart of intersection of the ratio of the energy storage coefficient ratio of the sea-phase low-carburized rock reservoir and the land-phase tight sandstone reservoir and the gas production contribution rate of the sea-phase low-carburized rock reservoir, and obtaining a gas production contribution rate evaluation relation model of the sea-phase low-carburized rock reservoir through single-parameter regression;
s5, determining the gas production of the gas well sea phase low-carburized rock reservoir and the gas production of the land phase tight sandstone reservoir to be evaluated
And according to the gas production contribution rate evaluation relation model of the sea phase low-carburized rock reservoir established in the step S4, the gas production contribution rate of the sea phase low-carburized rock reservoir of the gas well to be evaluated is calculated by combining the logging parameters of the reservoir of the gas well to be evaluated, and then the gas production rate of the sea phase low-carburized rock reservoir and the gas production rate of the land phase tight sandstone reservoir of the gas well to be evaluated are obtained.
According to the invention, a composite deposition gas reservoir yield splitting method is established through research on main control factors of land-phase compact sandstone-sea-phase low-carburized rock gas reservoir layering yield contribution, and a basis is provided for evaluation of exploitation indexes such as gas reservoir productivity and drainage range, optimization of development technical policies and numerical simulation research. For a tight sandstone-low carburized rock composite deposition gas reservoir well which is not subjected to gas production profile test, the method can be used for solving the contribution rate of layered gas production by utilizing conventional logging interpretation parameters so as to realize split of layered content.
Example 2:
based on the embodiment 1, further, the analysis of the main control factor of the layered gas production contribution in the step S1 starts from the seepage basic theory, and combines with the reserve calculation formula to study the layered production of the multi-layered gas production well.
According to the well test theory, in the early stage of production of the gas well of the combined layer production gas reservoir, the layering yield proportion is distributed according to stratum coefficients, and when pressure waves are transmitted to the boundary to form quasi-steady-state flow, the layering yield contribution approaches to the reserve ratio of each layer. According to reserve calculation formula (equation 1), the stratified yield contribution rate is subjected to the stratified energy storage coefficient duty ratioNatural gas volume coefficient B gj And a leakage radius r ej And (5) controlling.
Wherein f j The yield contribution rate of the j-th small layer;
h j a reservoir effective thickness of a j-th layer;
φ j reservoir porosity for the j-th layer;
S gj reservoir gas saturation for the j-th layer;
h j φ j S gj is the energy storage coefficient of the j-th layer.
Under the condition of similar temperature and pressure system and fluid properties, after pressure wave is transmitted to the leakage boundary, the layered energy storage coefficient is calculatedThe contribution rate of the layering yield has a large influence.
Therefore, through the theoretical analysis of the layered gas production contribution, the main control factor of the layered gas production contribution of the gas well is realized as each small-layer energy storage coefficient.
Example 3:
on the basis of the embodiment, the layered gas production contribution rate is derived from gas production profile test data of a combined layer mining well in a compact sandstone-low-carburized rock composite deposition gas reservoir, specifically, aiming at a gas well which is mined by a land-phase compact sandstone-sea-phase low-carburized rock composite deposition gas reservoir and has gas production profile test results, the gas production contribution rates of each small layer of a sandstone reservoir and a carbonate reservoir are summed respectively to obtain the gas production contribution rates of the sandstone reservoir and the carbonate reservoir, 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.
For a gas well with continuous multiple gas production profile test data, the gas production contribution ratio of the tight sandstone reservoir and the sea-phase low-carburized rock reservoir are calculated by arithmetic average, so that the gas production contribution ratio of each layer is obtained.
Example 4:
based on the embodiment, 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 S g Wherein, three parameters of effective thickness, porosity and gas saturation of the reservoir are all obtained by well logging interpretation.
Thus, as a further preferable scheme, according to the gas well mined by the land-phase compact sandstone-sea-phase low-carburized rock composite deposition gas reservoir and provided with the gas production profile test, the energy storage coefficients of the sandstone reservoir and the carbonate reservoir and the respective duty ratio (omega) are calculated respectively Carbonate rock 、ω Sandstone ) Found by multi-factor intersection regression: the gas production contribution rate of the ancient carbonate reservoir and the ratio of the energy storage coefficients of the carbonate reservoir and the sandstone reservoir (omega) Carbonate rock /ω Sandstone ) In a logarithmic relationship as shown in figure 1.
Wherein:
ω carbonate rock -a ratio of the carbonate storage coefficients to the sum of the storage coefficients of the individual strata of the carbonate reservoir to the total storage coefficient;
ω sandstone -the ratio of the energy storage coefficients of the sandstone reservoir, the sum of the energy storage coefficients of the individual strata 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 ratio of the carbonate reservoir is obtained through regression, and is shown in a formula (3).
Wherein,
wherein f C The gas production contribution rate of the ancient carbonate reservoir;
h j a reservoir effective thickness of a j-th layer;
φ j reservoir porosity for the j-th layer;
S gj reservoir gas saturation for the j-th 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 interpretation effective thickness, porosity and gas saturation parameters of the gas well reservoir to be evaluated; multiplying the gas production contribution rate of the carbonate reservoir by the wellhead yield of the gas well on the basis, so as to obtain the gas production rate of the carbonate reservoir of the gas well to be evaluated; 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 deposition gas reservoir yield splitting method is established through research on main control factors of land-phase compact sandstone-sea-phase low-carburized rock gas reservoir layering yield contribution, and a basis is provided for evaluation of exploitation indexes such as gas reservoir productivity and drainage range, optimization of development technical policies and numerical simulation research.
Example 5:
the embodiment provides a method for evaluating the yield contribution rate of a composite deposition gas reservoir, which comprises the following steps:
s1, analyzing main control factors of layered gas production contribution
By combining the characteristics of the land-phase compact sandstone-sea-phase low-carburized rock composite deposition gas reservoir, analyzing and determining main control factors influencing yield split of a layer-by-layer production gas well as energy storage coefficients of all small layers through a layered gas production contribution theory;
s2, obtaining layering gas production contribution rate
Selecting a gas well which is mined by a land-phase compact sandstone-sea-phase low-carburized rock composite deposit gas reservoir layer and has a gas production profile test result, and then summing the gas production contribution rates of each small layer of a sandstone reservoir and a carbonate reservoir according to the gas production profile test data of the selected gas well to obtain the gas production contribution rates of the sandstone reservoir and the carbonate reservoir;
s3, obtaining layered energy storage coefficients
Calculating the energy storage coefficient (hPhiS) of each small layer of the gas well produced by the land-phase compact sandstone-sea-phase low-carburized rock composite deposition gas reservoir layer g ) Summing the energy storage coefficients of each small layer 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 reservoir Carbonate 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 duty ratio (omega) of the sandstone reservoir Sandstone ) And dividing the two to obtain the ratio (omega) of the energy storage coefficient ratio of the carbonate rock and the sandstone reservoir Carbonate rock /ω Sandstone )；
S4, establishing a layered gas production contribution rate and energy storage coefficient relation model
Drawing a chart of intersection 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 the gas production of the carbonate reservoir of the gas well to be evaluated and the gas production of the sandstone reservoir
According to the gas production contribution rate evaluation relation model of the carbonate reservoir established in the step S4, the gas production contribution rate of the carbonate reservoir is calculated by combining the parameters of effective thickness, porosity and gas saturation of well logging interpretation of the gas well reservoir to be evaluated; multiplying the gas production contribution rate of the carbonate reservoir by the wellhead yield of the gas well on the basis of the gas production contribution rate, so that the gas production rate of the carbonate reservoir can be obtained; and subtracting the carbonate reservoir gas yield from the wellhead yield of the gas well to obtain the sandstone reservoir gas yield.
The method for evaluating the layered yield contribution rate of the composite sedimentary gas reservoir is applied to a clean side gas field, and the yield split rate of a gas well is improved from 2.6% to more than 85.2% by evaluating the 700 more than one hole of the gas contribution of the underground ancient carbonate production layer; meanwhile, the method can save the testing cost by 210 ten thousand yuan/year (the ratio of the number of the testing wells of 706 production wells is 5 percent, and the single well testing cost is 5.95 ten thousand yuan).
In conclusion, the invention provides a land-phase compact sandstone-sea-phase low-carburized rock composite deposition gas reservoir layered yield splitting method based on seepage theory and on analysis of factors contributing to layered yield of multi-layer gas recovery wells. The method solves the problem of splitting the production of the multi-layer gas production well of different deposition systems under the conditions of strong heterogeneity, more wells and lack of gas production profile test data of the reservoir of the Erdos basin, and provides a basis for accurately evaluating parameters such as the layering production, the dynamic reserve, the extraction degree, the drainage range and the like of the reservoir of the land-phase compact sandstone and the sea-phase low-carburized rock. And the application of the gas fields such as Jing side, elm forest, su Lige and the like proves that the method is simple, convenient and applicable, can save a great amount of field test cost, and has great practical value and economic value.
The foregoing is merely a preferred embodiment of the present invention and it should be noted that numerous other modifications and embodiments can be devised by those skilled in the art which fall within the scope and spirit of the principles of this disclosure without departing from the technical principles of this invention. More specifically, various variations and modifications may be made to the component parts and/or arrangements of the subject combination arrangement within the scope of the disclosure, drawings and claims of this application. In addition to variations and modifications in the component parts and/or arrangements, other uses will be apparent to those skilled in the art.
Claims (6)
1. The method for evaluating the layered yield contribution rate of the composite deposition gas reservoir is characterized by comprising the following steps of:
s1, determining main control factors of layered gas production contribution
Determining main control factors influencing yield splitting of the combined production gas well as energy storage coefficients of all small layers according to a seepage theory;
s2, obtaining a layered gas production contribution rate
Selecting a gas well which is mined by a land-phase compact sandstone-sea-phase low-carburized rock composite deposition 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 a land-phase compact sandstone reservoir and a sea-phase low-carburized carbonate reservoir according to the gas production profile test result of the selected gas well;
the gas production contribution rate of the land-phase tight sandstone reservoir is the sum of the gas production contribution rates of all the small layers in the land-phase tight sandstone reservoir; the gas production contribution rate of the sea-phase low-carburized rock reservoir is the sum of the gas production contribution rates of all the small layers in the sea-phase low-carburized rock reservoir;
s3, obtaining a layered energy storage coefficient
According to an energy storage coefficient calculation formula, respectively calculating the energy storage coefficients and the respective duty ratios of the sea-phase low-carburized rock reservoir and the land-phase tight sandstone reservoir;
the energy storage coefficient of the sea-phase low-carburized rock reservoir is the sum of the energy storage coefficients of all small layers of the sea-phase low-carburized carbonate rock reservoir; the energy storage coefficient of the land-phase compact sandstone reservoir is the sum of the energy storage coefficients of all small layers of the land-phase compact sandstone reservoir;
the energy storage coefficient of the sea phase low-carburized rock reservoir occupies a ratio omega Carbonate rock The ratio of the sum of the energy storage coefficients of all the small layers of the sea-phase hypotonic carbonate reservoir to the total energy storage coefficient;
energy storage coefficient of land-phase compact sandstone reservoir with ratio omega Sandstone The ratio of the sum of the energy storage coefficients of all small layers of the land-phase tight sandstone reservoir to the total energy storage coefficient;
s4, establishing a layered gas production contribution rate and energy storage coefficient relation model
Drawing a chart of intersection of the ratio of the energy storage coefficient ratio of the sea-phase low-carburized rock reservoir and the land-phase tight sandstone reservoir and the gas production contribution rate of the sea-phase low-carburized rock reservoir, and obtaining a gas production contribution rate evaluation relation model of the sea-phase low-carburized rock reservoir through single-parameter regression; the ratio of the energy storage coefficient ratio of the sea phase low-carburized rock reservoir and the land phase compact sandstone reservoir is omega Carbonate rock /ω Sandstone ；
S5, determining the gas production of the gas well sea phase low-carburized rock reservoir and the gas production of the land phase tight sandstone reservoir to be evaluated
According to the gas production contribution rate evaluation relation model of the sea phase low-carburized rock reservoir established in the step S4, the gas production contribution rate of the sea phase low-carburized rock reservoir of the gas well to be evaluated is calculated by combining the logging interpretation parameters of the reservoir of the gas well to be evaluated, and then the gas production rate of the sea phase low-carburized rock reservoir of the gas well to be evaluated and the gas production rate of the land phase tight sandstone reservoir are obtained;
the gas production contribution rate f of the sea-phase low-carburized rock reservoir of the gas well to be evaluated C The calculation formula of (2) is as follows:
。
2. the method for evaluating the layered production contribution rate of the composite deposition gas reservoir according to claim 1, wherein the method comprises the following steps of: 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 ɸ S g 。
3. The method for evaluating the layered production contribution rate of the composite deposition gas reservoir according to claim 2, wherein the method comprises the following 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 all obtained by well logging interpretation.
4. The method for evaluating the layered production contribution rate of the composite deposition gas reservoir according to claim 3, wherein the method comprises the following steps of: the energy storage coefficient of the sea phase low-carburized rock reservoir occupies a ratio omega Carbonate rock The calculation formula of (2) is
；
Energy storage coefficient of land-phase compact sandstone reservoir with ratio omega Sandstone The calculation formula of (2) is
In the formula, h j A reservoir effective thickness of a j-th layer;
φ j reservoir porosity for the j-th layer;
S gj reservoir gas saturation for the j-th layer.
5. The method for evaluating the layered production contribution rate of the composite deposition gas reservoir according to claim 1, wherein the method comprises the following steps of: the gas production rate of the sea-phase low-carburized rock reservoir of the gas well to be evaluated is the product of the gas production contribution rate of the sea-phase low-carburized rock reservoir of the gas well to be evaluated and the wellhead yield of the gas well.
6. The method for evaluating the layered production contribution rate of the composite deposition gas reservoir according to claim 5, wherein the method comprises the following steps of: and the gas production of the land-phase tight sandstone reservoir of the gas well to be evaluated is obtained by subtracting the gas production of the sea-phase low-carburized rock reservoir of the gas well to be evaluated from the gas well wellhead yield.
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