Gas storage capacity determination method and device, storage medium and processor

Abstract

The invention relates to the field of natural gas underground storage, and discloses a gas storage capacity determination method and device, a storage medium and a processor. The method comprises the steps that based on a numerical simulation model of a gas storage, the residual gas amount of the gas storage after oil and gas development is completed is determined; on the basis of the liquid drainage amount corresponding to each liquid drainage well in the first liquid drainage time period, the liquid drainage amount proportion from each sedimentary microphase in the first liquid drainage time period is determined; based on the final total liquid drainage amount and the liquid drainage amount proportion, obtained through simulation of the numerical simulation model, of the gas storage, the liquid drainage amount from each sedimentary microphase in the final total liquid drainage amount is determined; and determining the maximum storage capacity of the gas storage according to the residual gas volume of the gas storage after oil and gas development is finished, the gas storage space utilization rate of each sedimentary microphase and the liquid discharge amount from each sedimentary microphase in the final total liquid discharge amount. Based on the scheme, the accuracy of calculating the storage capacity of the gas storage can be improved, and then a more reliable basis can be provided for evaluation of the injection-production operation capacity of the gas storage.

Description

Technical Field

[0001] The present invention relates to the technical field of underground natural gas storage, and in particular to a method for determining the storage capacity of a gas storage reservoir, a device for determining the storage capacity of a gas storage reservoir, a machine-readable storage medium and a processor. Background Art

[0002] An underground gas storage facility is a facility that uses underground geological structures to store natural gas. Among underground gas storage facilities, those converted from flooded oil and gas reservoirs are more common. Due to its large storage capacity, wide peak-shaving range, and durability, underground gas storage has become one of the important facilities in the natural gas industry chain, which can ensure safe and stable gas supply. Among them, the storage capacity of a gas storage facility is an important indicator for measuring the injection and production operation capacity of a gas storage facility. Therefore, it is of great significance to accurately calculate the storage capacity of a gas storage facility.

[0003] At present, the calculation of gas storage capacity is mainly based on the idealized fluid model. The storage capacity is calculated by static and dynamic methods in different zones, and then the storage capacity of each zone is accumulated to obtain the overall storage capacity. However, due to the influence of stratified water injection development, the water-flooded oil and gas reservoirs not only have different degrees of water flooding in the vertical direction, but also have no unified fluid interface in the plane. The oil-gas-water relationship is very complex, which is far from the idealized fluid model.

[0004] Therefore, the accuracy of calculating the storage capacity of the gas storage reservoir through the above scheme is low. Summary of the invention

[0005] The purpose of the present invention is to overcome the problem of low accuracy in calculating the storage capacity of a gas storage reservoir in the prior art, and to provide a method for determining the storage capacity of a gas storage reservoir, a device for determining the storage capacity of a gas storage reservoir, a machine-readable storage medium and a processor.

[0006] In order to achieve the above object, the present invention provides a method for determining the storage capacity of a gas storage reservoir, comprising: Based on the relative permeability data, PVT parameters and the three-dimensional geological model of the gas storage reservoir, a numerical simulation model of the gas storage reservoir is established; based on the numerical simulation model, the residual gas volume of the gas storage reservoir after the completion of oil and gas development is determined; Based on the discharge volumes of the respective drainage wells in the first drainage period, determining the proportion of the discharge volumes from each sedimentary microfacies in the first drainage period; Based on the final total discharge volume of the gas storage and the proportion of the discharge volume simulated by the numerical simulation model, determining the discharge volume from each sedimentary microfacies in the final total discharge volume; The maximum storage capacity of the gas storage reservoir is determined based on the residual gas volume in the gas storage reservoir after the completion of oil and gas development, the gas storage space utilization rate of each sedimentary microphase, the drainage volume from each sedimentary microphase in the final total drainage volume, and the oil and gas production volume.

[0007] In an embodiment of the present application, the method further includes: establishing a three-dimensional geological model of the gas storage reservoir based on geological data.

[0008] In the embodiment of the present application, the three-dimensional geological model of the gas storage reservoir is established according to the geological data, including: Using core description and thin section identification, combined with rock electrical characteristics and hydrodynamic conditions, the sedimentary profile and plan distribution of the gas storage reservoir are established; Based on the sedimentary profile and the planar distribution, reservoir sedimentary microfacies characteristics are obtained; Based on the reservoir sedimentary microfacies characteristics, combined with logging data and seismic data, a three-dimensional geological model of the gas storage reservoir is established.

[0009] In the embodiment of the present application, the relative permeability data includes oil-gas relative permeability data, oil-water relative permeability data, and gas-water relative permeability data; The method of establishing a numerical simulation model of a gas storage reservoir based on relative permeability data, PVT parameters and a three-dimensional geological model of the gas storage reservoir comprises: A numerical simulation model of the gas storage reservoir is established based on the oil and gas relative permeability data, oil and water relative permeability data, gas and water relative permeability data, PVT parameters and the three-dimensional geological model of the gas storage reservoir.

[0010] In an embodiment of the present application, the method further includes: obtaining oil and gas relative permeability data, oil and water relative permeability data, gas and water relative permeability data and PVT parameters based on core testing.

[0011] In an embodiment of the present application, after establishing the numerical simulation model of the gas storage, the method further comprises: fitting the numerical simulation model based on production dynamic characteristics during oil and gas development of the gas storage.

[0012] In the embodiment of the present application, the production dynamic characteristics include water injection layer, water injection volume and production effectiveness.

[0013] In an embodiment of the present application, determining the proportion of the drainage volume from each sedimentary microphase in the first drainage period includes: For each of the drainage wells, determining the drainage volume from each sedimentary microfacies in the drainage volume corresponding to the first drainage period of the drainage well; According to the drainage volume from each sedimentary microphase in the drainage volume corresponding to each drainage well in the first drainage period, the proportion of the drainage volume from each sedimentary microphase in the first drainage period is determined.

[0014] In the embodiment of the present application, the oil and gas production volume includes the natural gas production volume during the liquid discharge process and the crude oil production volume during the liquid discharge process; The maximum storage capacity of the gas storage is determined based on the residual gas volume of the gas storage after the completion of oil and gas development, the gas storage space utilization rate of each sedimentary microphase, the drainage volume from each sedimentary microphase in the final drainage volume, and the oil and gas production volume, including: The maximum storage capacity of the gas storage reservoir is determined based on the residual gas volume in the gas storage reservoir after the completion of oil and gas development, the gas storage space utilization rate of each sedimentary microphase, the drainage volume from each sedimentary microphase in the total final drainage volume, the natural gas production during the drainage process, and the crude oil production during the drainage process.

[0015] In the embodiment of the present application, the sedimentary microfacies include underwater distributary channels, estuary bars and sheet sands, and the maximum storage capacity of the gas storage is determined based on the following formula: G sc =[V e +(V c / B w )×λ c +(V m / B w )×λ m +(V s / B w )×λ s +V g +(V o / B o )] / 10000 / B g ; Among them, G sc V is the maximum storage capacity of the gas storage facility, in billion cubic meters; e V is the residual gas volume after the completion of oil and gas development, in ten thousand cubic meters; c B is the amount of liquid discharged from the underwater diversion channel in the total final discharge, in ten thousand cubic meters; w is the volume coefficient of water under the corresponding pressure of the discharged liquid; c V is the utilization rate of the gas storage space in the underwater diversion channel; m is the discharge volume from the estuary dam in the final total discharge volume, in ten thousand cubic meters; m is the gas storage space utilization rate of the estuary dam; V s is the amount of liquid discharged from the sheet sand in the final total liquid discharge, in ten thousand cubic meters; s V is the utilization rate of the gas storage space of the mat sand; g V is the natural gas production volume during the drainage process, in ten thousand cubic meters; o is the crude oil production during the drainage process, in ten thousand cubic meters; B o B is the volume coefficient of crude oil at the corresponding pressure of the discharged liquid; g is the volume coefficient of gas at the upper limit pressure of the gas storage reservoir.

[0016] In an embodiment of the present application, the method further includes: Determine the drainage volume corresponding to each sedimentary microfacies in the gas storage reservoir at the target drainage stage; Based on the drainage volume corresponding to each sedimentary microphase in the gas storage reservoir at the target drainage stage and the gas storage space utilization rate of each sedimentary microphase, the additional storage capacity of the gas storage reservoir at the target drainage stage is determined.

[0017] In the embodiment of the present application, the target drainage stage is the drainage stage that has occurred in the gas storage reservoir, and determining the drainage volume corresponding to each sedimentary microphase in the gas storage reservoir at the target drainage stage includes: Based on the drainage volume of each drainage well at the target drainage stage, the drainage volume of each sedimentary microfacies in the gas storage reservoir at the target drainage stage is determined.

[0018] In the embodiment of the present application, the target drainage stage is a drainage stage that has not occurred in the gas storage reservoir, and the determining of the drainage volume corresponding to each sedimentary microphase in the gas storage reservoir in the target drainage stage includes: predicting the drainage volume of the gas storage reservoir in the target drainage stage based on the numerical simulation model; According to the liquid discharge ratio and the liquid discharge volume of the gas storage reservoir at the target liquid discharge stage, the liquid discharge volumes corresponding to the respective sedimentary microfacies in the gas storage reservoir at the target liquid discharge stage are determined.

[0019] In the embodiment of the present application, the sedimentary microfacies include underwater distributary channels, estuary bars and sheet sands, and the additional storage capacity of the gas storage reservoir in the target drainage stage is determined based on the following formula: G sci =[(V' c / B w )×λ c +(V' m / B w )×λ m +(V' s / B w )×λ s +V g +V' o / B o ] / 10000 / B g ; Among them, G sci V' is the additional storage capacity of the gas storage during the target drainage stage, in billion cubic meters; c B is the discharge volume of the underwater diversion channel at the target discharge stage, in ten thousand cubic meters; w is the volume coefficient of water under the corresponding pressure of the discharged liquid; c V is the utilization rate of the gas storage space in the underwater diversion channel; m is the discharge volume of the estuary dam at the target discharge stage, in ten thousand cubic meters; m is the gas storage space utilization rate of the estuary dam; V sis the discharge volume of sheet sand at the target discharge stage, in ten thousand cubic meters; s V is the utilization rate of the gas storage space of the mat sand; g is the natural gas production volume during the drainage process, in ten thousand cubic meters; V' o is the crude oil production during the drainage process, in ten thousand cubic meters; B o B is the volume coefficient of crude oil at the corresponding pressure of the discharged liquid; g is the volume coefficient of gas at the upper limit pressure of the gas storage reservoir.

[0020] A second aspect of the present application provides a gas storage capacity determination device, comprising: A numerical simulation model building module is used to establish a numerical simulation model of the gas storage reservoir based on relative permeability data, PVT parameters and a three-dimensional geological model of the gas storage reservoir; an initial storage capacity determination module is used to determine the residual gas volume of the gas storage reservoir after the completion of oil and gas development based on the numerical simulation model; A sedimentary microfacies drainage volume determination module is used to determine the proportion of drainage volume from each sedimentary microfacies in the first drainage period based on the drainage volume corresponding to each drainage well in the first drainage period; based on the final drainage volume of the gas storage reservoir obtained by the numerical simulation model and the drainage volume proportion, determine the drainage volume from each sedimentary microfacies in the final drainage volume; The storage capacity calculation module is used to determine the maximum storage capacity of the gas storage reservoir based on the residual gas volume in the gas storage reservoir after the completion of oil and gas development, the gas storage space utilization rate of each sedimentary microphase, the drainage volume from each sedimentary microphase in the final total drainage volume, and the oil and gas production volume.

[0021] In an embodiment of the present application, the numerical simulation model building module is also used to fit the numerical simulation model based on the production dynamic characteristics of the oil and gas development process of the gas storage after the numerical simulation model of the gas storage is established.

[0022] In the embodiment of the present application, the sedimentation microphase drainage volume determination module is used to: For each of the drainage wells, determining the drainage volume from each sedimentary microfacies in the drainage volume corresponding to the first drainage period of the drainage well; According to the drainage volume from each sedimentary microphase in the drainage volume corresponding to each drainage well in the first drainage period, the proportion of the drainage volume from each sedimentary microphase in the first drainage period is determined.

[0023] In the embodiment of the present application, the sedimentary microphase drainage volume determination module is also used to determine the drainage volume corresponding to each sedimentary microphase in the gas storage reservoir at the target drainage stage; The storage capacity calculation module is also used to determine the newly added storage capacity of the gas storage reservoir at the target drainage stage based on the drainage volume corresponding to each sedimentary microphase in the gas storage reservoir at the target drainage stage and the gas storage space utilization rate of each sedimentary microphase.

[0024] A third aspect of the present application provides a processor configured to execute the above-mentioned method for determining the storage capacity of a gas storage facility.

[0025] A fourth aspect of the present application provides a machine-readable storage medium having instructions stored thereon, which, when executed by a processor, configures the processor to execute the above-mentioned method for determining the storage capacity of a gas storage reservoir.

[0026] Through the above technical scheme, the technical scheme includes: establishing a numerical simulation model of the gas storage reservoir based on relative permeability data, PVT parameters and a three-dimensional geological model of the gas storage reservoir; determining the residual gas volume of the gas storage reservoir after the completion of oil and gas development based on the numerical simulation model; determining the proportion of the drainage volume from each sedimentary microphase in the first drainage period based on the drainage volume corresponding to each drainage well in the first drainage period; determining the drainage volume from each sedimentary microphase in the final drainage volume based on the final drainage volume of the gas storage reservoir simulated by the numerical simulation model and the drainage volume proportion; determining the maximum storage capacity of the gas storage reservoir according to the residual gas volume of the gas storage reservoir after the completion of oil and gas development, the gas storage space utilization rate of each sedimentary microphase, the drainage volume from each sedimentary microphase in the final drainage volume, and the oil and gas production. Based on the scheme provided by the embodiment of the present application, the accuracy of calculating the storage capacity of the gas storage reservoir can be improved, and thus a more reliable basis can be provided for the evaluation of the injection and production operation capacity of the gas storage reservoir.

[0027] Other features and advantages of the embodiments of the present application will be described in detail in the subsequent specific implementation section. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] The accompanying drawings are used to provide a further understanding of the embodiments of the present application and constitute a part of the specification. Together with the following specific implementations, they are used to explain the embodiments of the present application, but do not constitute a limitation on the embodiments of the present application. In the accompanying drawings: Figure 1 A schematic diagram of a flow chart of a method for determining the storage capacity of a gas storage reservoir according to an embodiment of the present application is schematically shown; Figure 2 A schematic diagram of a flow chart of another method for determining the storage capacity of a gas storage reservoir according to an embodiment of the present application is schematically shown; Figure 3 A schematic diagram of the fracture distribution of the gas storage reservoir M according to an embodiment of the present application is shown; Figure 4 The geological evaluation results of the gas storage M according to the embodiment of the present application are schematically shown; Figure 5 A schematic diagram of a three-dimensional geological model of a gas storage reservoir M according to an embodiment of the present application is schematically shown; Figure 6 The numerical simulation result of the original water saturation of the gas storage M according to the embodiment of the present application is schematically shown; Figure 7 Schematically showing the numerical simulation results of water saturation before the establishment of the gas storage M according to the embodiment of the present application; Figure 8 A numerical simulation curve of underground water storage capacity of a gas storage reservoir M according to an embodiment of the present application is schematically shown; Fig. 9 A structural block diagram of a gas storage capacity determination device according to an embodiment of the present application is schematically shown; Fig.10 The internal structure of a computer device according to an embodiment of the present application is schematically shown.

[0029] Description of Reference Numerals 210-numerical simulation model building module; 220-initial reservoir capacity determination module; 230-sedimentation microphase drainage volume determination module; 240-reservoir capacity calculation module; A01-processor; A02-network interface; A03-internal memory; A04-display screen; A05-input device; A06-non-volatile storage medium; B01-operating system; B02-computer program. DETAILED DESCRIPTION

[0030] In order to make the purpose, technical scheme and advantages of the embodiments of the present application clearer, the technical scheme in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. It should be understood that the specific implementation methods described herein are only used to illustrate and explain the embodiments of the present application, and are not used to limit the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of this application.

[0031] It should be noted that if the embodiments of the present application involve directional indications (such as up, down, left, right, front, back...), such directional indications are only used to explain the relative position relationship, movement status, etc. between the components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0032] In addition, if there are descriptions involving "first", "second", etc. in the embodiments of the present application, the descriptions of "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or suggesting their relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In addition, the technical solutions between the various embodiments can be combined with each other, but they must be based on the ability of ordinary technicians in the field to implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such combination of technical solutions does not exist and is not within the scope of protection required by this application.

[0033] As described in the background technology, an underground gas storage is a facility that uses underground geological structures to store natural gas. Among underground gas storages, gas storages converted from water-flooded oil and gas reservoirs are more common. Underground gas storage has become one of the important facilities in the natural gas industry chain due to its large storage capacity, wide peak-shaving range, and durability, which can ensure safe and stable gas supply. Among them, the storage capacity of the gas storage is an important indicator to measure the injection and production operation capacity of the gas storage. Therefore, it is of great significance to accurately calculate the storage capacity of the gas storage. At present, the storage capacity calculation of the gas storage is mainly based on the idealized fluid model. The storage capacity is calculated by static and dynamic methods in different zones, and then the storage capacity of each zone is accumulated to obtain the overall storage capacity. However, due to the influence of stratified water injection development, the water-flooded oil and gas reservoir not only has different degrees of flooding in the vertical direction, but also has no unified fluid interface in the plane. The oil-gas-water relationship is very complicated before the reservoir is built. At this time, the oil and gas reservoir is not compatible with the idealized fluid model, and the difference is far. In addition, the static method has poor applicability in the multi-cycle dynamic injection and production process, and cannot accurately evaluate the degree of reservoir capacity utilization. It is generally only applicable to the preliminary evaluation of reservoir site selection. The calculation accuracy of the dynamic method is closely related to the accuracy of the model, and the heterogeneous characteristics of the reservoir are not taken into account. The calculation process is not only complicated, but also not very accurate. Therefore, the accuracy of the gas storage reservoir capacity calculated by the scheme in the prior art is low.

[0034] In view of this, an embodiment of the present application provides a method for determining the storage capacity of a gas storage reservoir, that is, a method for determining the storage capacity of a gas storage reservoir, which can be used to calculate the storage capacity of a gas storage reservoir converted from a flooded oil and gas reservoir. The storage capacity of a gas storage reservoir refers to the gas storage space of the gas storage reservoir. Figure 1 As shown, the method for determining the gas storage capacity may include the following steps: Step 101: A numerical simulation model of the gas storage reservoir is established based on relative permeability data, PVT parameters and a three-dimensional geological model of the gas storage reservoir.

[0035] Among them, a three-dimensional geological model of the gas storage reservoir can be established based on geological data; the specific establishment process may include the following steps 1), step 2) and step 3): 1) Using core description and thin section identification, combined with rock electrical characteristics and hydrodynamic conditions, the sedimentary profile and plan distribution of the gas storage reservoir are established.

[0036] The sedimentary profile of the gas storage reservoir, that is, the sedimentary profile of the reservoir layer section corresponding to the gas storage reservoir, may be a typical sedimentary profile.

[0037] 2) Based on the sedimentary profile and the planar distribution, reservoir sedimentary microfacies characteristics are obtained.

[0038] The reservoir sedimentary microfacies characteristics may include the lateral contact relationship between different microfacies sand bodies in the gas storage reservoir, the heterogeneity changes of the gas storage reservoir, etc.

[0039] It can be understood that the lateral contact relationship between different microphase sand bodies in the gas storage, that is, the lateral contact relationship between different microphase sand bodies in the reservoir layer corresponding to the gas storage; the heterogeneity changes of the gas storage, that is, the heterogeneity changes of the reservoir layer corresponding to the gas storage; the subsequent description of the gas storage can be inferred by analogy and will not be repeated.

[0040] 3) Based on the reservoir sedimentary microfacies characteristics, combined with logging data and seismic data, a three-dimensional geological model of the gas storage reservoir is established.

[0041] In specific implementation, based on the reservoir sedimentary microfacies characteristics, combined with logging and seismic data, etc., random modeling technology can be applied to make a detailed description of the reservoir layer sections corresponding to the gas storage, thereby establishing a three-dimensional geological model of the gas storage, so as to stereoscopically depict the development characteristics of the main sand bodies and porosity and permeability spaces in the gas storage.

[0042] In an embodiment of the present application, the relative permeability data may include oil-gas relative permeability data, oil-water relative permeability data, and gas-water relative permeability data, and the oil-gas relative permeability data, oil-water relative permeability data, gas-water relative permeability data, and PVT parameters may all be obtained from core testing. Furthermore, the establishment of a numerical simulation model of a gas storage reservoir based on the relative permeability data, PVT parameters, and a three-dimensional geological model of the gas storage reservoir may include: establishing a numerical simulation model of a gas storage reservoir based on the oil-gas relative permeability data, oil-water relative permeability data, gas-water relative permeability data, PVT parameters, and a three-dimensional geological model of the gas storage reservoir.

[0043] In practical applications, in order to further improve the accuracy of the numerical simulation model of the gas storage, the numerical simulation model can reflect the oil, gas and water distribution of the corresponding reservoir layer before the gas storage is established (or before drainage) as realistically as possible, so that the storage capacity of the gas storage can be accurately predicted later. In one embodiment, after the numerical simulation model of the gas storage is established, the numerical simulation model can also be fitted based on the production dynamic characteristics of the oil and gas development process of the gas storage.

[0044] Specifically, the numerical simulation model can be historically fitted based on the production dynamic characteristics of the gas storage reservoir in the entire process of oil and gas development before drainage. The production dynamic characteristics may include water injection layer, water injection volume, and production effectiveness. In the actual fitting process, the injection water volume and production effectiveness of the numerical simulation model are particularly fitted.

[0045] After fitting the numerical simulation model based on the production dynamic characteristics during the oil and gas development of the gas storage, combined with the test data of the gas storage at the end of the oil and gas development, the oil, gas and water distribution of the corresponding reservoir layer before the establishment of the gas storage can be obtained.

[0046] Step 102: Determine the residual gas volume in the gas storage after the oil and gas development is completed based on the numerical simulation model.

[0047] That is, the numerical simulation model can be used to obtain the gas storage space of the reservoir after the completion of oil and gas development, which can also be called the residual gas volume of the oil and gas reservoir in the late stage of oil and gas development.

[0048] Step 103 , based on the drainage volumes of the drainage wells in the first drainage period, determine the proportion of the drainage volume from each sedimentary microfacies in the first drainage period.

[0049] Specifically, based on the discharge volume of each drainage well in the first drainage period, the total discharge volume of the gas storage reservoir in the first drainage period is determined, and the proportion of the discharge volume from each sedimentary microphase in the total discharge volume is determined.

[0050] In actual applications, after a gas storage reservoir is built, drainage wells are usually used to drain underground water to expand the storage capacity of the gas storage reservoir. Therefore, the drainage volume can also be called water discharge volume.

[0051] The drainage wells are drainage wells distributed in the corresponding area of ​​the gas storage reservoir. For example, if the corresponding area of ​​the gas storage reservoir is a gas-bearing area, then the drainage wells are drainage wells distributed in the gas-bearing area.

[0052] The first drainage period may be a period corresponding to the time when the gas storage starts draining to the current drainage time, or may be any period between the time when the gas storage starts draining and the current drainage time. In the embodiment of the present application, the first drainage period corresponds to the actual drainage process (or the drainage process that has occurred) of the gas storage. After the drainage well is put into the drainage well for drainage, the drainage volume of each drainage well can be monitored to obtain the drainage volume corresponding to each drainage well in the first drainage period.

[0053] It can be understood that by adding up the discharge volumes of each discharge well in the first discharge period, the total discharge volume of the gas storage in the first discharge period can be obtained.

[0054] In the embodiment of the present application, determining the proportion of the drainage volume from each sedimentary microphase in the first drainage period may include step i and step ii, which are specifically as follows: Step i: for each of the drainage wells, determine the drainage volume from each sedimentary microphase in the drainage volume corresponding to the first drainage period of the drainage well.

[0055] The sedimentary microfacies, i.e., the sedimentary microfacies in the gas storage reservoir, may include, for example, underwater diversion channels, estuary bars, sheet sand, etc. The same operation as in step i is performed on each of the drainage wells.

[0056] In specific implementation, the coefficient of variation of each sedimentary microphase reservoir can be calculated for each drainage well, and the coefficient of variation of each sedimentary microphase reservoir in the gas storage reservoir can be calculated by thickness weighted average. Then, according to the sedimentary microphase division results of each drainage well, the thickness and average permeability of each sedimentary microphase reservoir in the gas storage reservoir are counted. Then, the drainage volume of each drainage well is split to obtain the drainage volume from different sedimentary microphases, that is, the drainage volume from each sedimentary microphase in the drainage volume of each drainage well is obtained.

[0057] Step ii, determining the proportion of the discharge volume from each sedimentary microphase in the first drainage period according to the discharge volume from each drainage well in the first drainage period corresponding to the discharge volume from each sedimentary microphase.

[0058] It can be understood that, according to the amount of drainage from each sedimentary microphase in the drainage amount corresponding to each drainage well in the first drainage period, the total drainage amount corresponding to each sedimentary microphase in the gas storage reservoir in the first drainage period can be obtained. Furthermore, according to the total drainage amount corresponding to each sedimentary microphase and the total drainage amount of the gas storage reservoir in the first drainage period, the proportion of drainage from each sedimentary microphase in the total drainage amount can be obtained, that is, the proportion of drainage from each sedimentary microphase in the first drainage period.

[0059] Step 104, based on the final total discharge volume of the gas storage reservoir and the proportion of the discharge volume simulated by the numerical simulation model, determine the discharge volume from each sedimentary microfacies in the final total discharge volume.

[0060] The liquid discharge ratio is the liquid discharge ratio of each sedimentary microphase obtained in step 103 .

[0061] The cumulative amount of liquid discharged from the gas storage reservoir from the time when liquid discharge starts to the time when liquid discharge ends (or the time when the formation pressure of the gas storage reservoir no longer decreases, liquid is no longer discharged, and the gas storage space in the gas storage reservoir reaches the maximum) is the final total amount of liquid discharge from the gas storage reservoir, and the final total amount of liquid discharge can be predicted based on the numerical simulation model. In specific implementation, multi-cycle liquid discharge simulation can be performed based on the numerical simulation model. When the liquid discharge from the gas storage reservoir no longer increases, it corresponds to the final total amount of liquid discharge.

[0062] Step 105, determining the maximum storage capacity of the gas storage reservoir according to the residual gas volume of the gas storage reservoir after the completion of oil and gas development, the gas storage space utilization rate of each sedimentary microphase, the drainage volume from each sedimentary microphase in the final drainage volume, and the oil and gas production volume.

[0063] Among them, the gas storage space utilization rate of each sedimentary microphase can be obtained based on the core chamber simulation experiment. The gas storage space utilization rate of each sedimentary microphase can include the gas storage space utilization rate of gas-driven oil and gas-driven water in each sedimentary microphase. In specific implementation, the gas storage space utilization rate of each sedimentary microphase can be determined based on the full-diameter long core displacement experiment.

[0064] The oil and gas production may include the natural gas production during the drainage process and the crude oil production during the drainage process, and then the maximum storage capacity of the gas storage is determined according to the residual gas volume of the gas storage after the completion of oil and gas development, the gas storage space utilization rate of each sedimentary microphase, the drainage volume from each sedimentary microphase in the final total drainage, and the oil and gas production. Specifically, it may include: determining the maximum storage capacity of the gas storage according to the residual gas volume of the gas storage after the completion of oil and gas development, the gas storage space utilization rate of each sedimentary microphase, the drainage volume from each sedimentary microphase in the final total drainage, the natural gas production during the drainage process, and the crude oil production during the drainage process.

[0065] The natural gas production during the drainage process and the crude oil production during the drainage process can be obtained by performing multi-cycle drainage simulation based on the numerical simulation model to determine the final drainage total amount. The drainage process is the drainage process corresponding to the start of drainage of the gas storage reservoir to the end of drainage of the gas storage reservoir.

[0066] Specifically, the maximum storage capacity of the gas storage facility can be determined based on the following formula (1): G sc =[V e +(V c / B w )×λ c +(V m / B w )×λ m +(V s / B w )×λ s +V g +(Vo / B o )] / 10000 / B g (1); In the above formula (1), G sc V is the maximum storage capacity of the gas storage facility, in billion cubic meters; e V is the residual gas volume in the gas storage after the completion of oil and gas development, in ten thousand cubic meters; c B is the amount of liquid discharged from the underwater diversion channel in the total final discharge, in ten thousand cubic meters; w is the volume coefficient of water under the corresponding pressure of the discharged liquid; c V is the utilization rate of the gas storage space in the underwater diversion channel; m is the discharge volume from the estuary dam in the final total discharge volume, in ten thousand cubic meters; m is the gas storage space utilization rate of the estuary dam; V s is the amount of liquid discharged from the sheet sand in the final total liquid discharge, in ten thousand cubic meters; s V is the utilization rate of the gas storage space of the mat sand; g V is the natural gas production volume during the drainage process, in ten thousand cubic meters; o is the crude oil production during the drainage process, in ten thousand cubic meters; B o B is the volume coefficient of crude oil at the corresponding pressure of the discharged liquid; g is the volume coefficient of gas at the upper limit pressure of the gas storage reservoir.

[0067] The pressure corresponding to the discharged liquid is the gas storage reservoir pressure. In practical applications, the pressure of the gas storage reservoir can be monitored in real time based on the deployed monitoring wells.

[0068] It can be understood that the method for determining the storage capacity of a gas storage reservoir provided by the embodiment of the present application includes establishing a numerical simulation model of the gas storage reservoir based on relative permeability data, PVT parameters and a three-dimensional geological model of the gas storage reservoir; determining the residual gas volume of the gas storage reservoir after the completion of oil and gas development based on the numerical simulation model; determining the proportion of the discharge volume from each sedimentary microphase in the first discharge period based on the discharge volume corresponding to each discharge well in the first discharge period; determining the discharge volume from each sedimentary microphase in the final discharge volume based on the final total discharge volume of the gas storage reservoir simulated by the numerical simulation model and the proportion of the discharge volume; determining the maximum storage capacity of the gas storage reservoir based on the residual gas volume of the gas storage reservoir after the completion of oil and gas development, the gas storage space utilization rate of each sedimentary microphase, the discharge volume from each sedimentary microphase in the final total discharge volume, and the oil and gas production. Based on the scheme provided by the embodiment of the present application, the accuracy of calculating the storage capacity of the gas storage reservoir can be improved, and thus a more reliable basis can be provided for the evaluation of the injection and production operation capacity of the gas storage reservoir.

[0069] Considering that the increased storage capacity of the gas storage is also very important, it is possible to evaluate the real-time changes in the storage capacity of the gas storage. Therefore, in one embodiment, Figure 2 As shown, the method for determining the storage capacity of a gas storage reservoir provided in the embodiment of the present application may further include step 106 and step 107, which are specifically as follows: Step 106, determining the drainage volume corresponding to each sedimentary microphase in the gas storage reservoir at the target drainage stage.

[0070] The target drainage stage can be any drainage stage, and each drainage stage has a corresponding gas storage reservoir pressure. In practical applications, the pressure of the gas storage reservoir can be monitored in real time according to the deployed monitoring wells. Then, the drainage volume corresponding to each sedimentary microphase in the target drainage stage is determined, that is, the drainage volume corresponding to each sedimentary microphase under the corresponding pressure is determined.

[0071] The target drainage stage may be a drainage stage that has occurred in the gas storage or a drainage stage that has not occurred in the gas storage. The target drainage stage is a drainage stage that has occurred in the gas storage, which can be understood as a drainage stage in the drainage process that has occurred in the gas storage. The target drainage stage is a drainage stage that has not occurred in the gas storage, which can be understood as a drainage stage that has not occurred in the gas storage at present but will occur in the future.

[0072] When the target drainage stage is the drainage stage that has occurred in the gas storage, determining the drainage volume of each sedimentary microphase in the gas storage at the target drainage stage may include: determining the drainage volume of each sedimentary microphase in the gas storage at the target drainage stage based on the drainage volume of each drainage well at the target drainage stage. Specifically, for each of the drainage wells, the drainage volume from each sedimentary microphase in the drainage volume corresponding to the target drainage stage may be determined; then, the drainage volume corresponding to each sedimentary microphase in the target drainage stage may be obtained according to the drainage volume from each sedimentary microphase in the drainage volume corresponding to each drainage well at the target drainage stage.

[0073] When the target drainage stage is a drainage stage that has not occurred in the gas storage reservoir, determining the drainage volume of each sedimentary microphase in the gas storage reservoir corresponding to the target drainage stage may include: predicting the drainage volume of the gas storage reservoir in the target drainage stage based on the numerical simulation model, and determining the drainage volume of each sedimentary microphase in the gas storage reservoir corresponding to the target drainage stage according to the proportion of the drainage volume of each sedimentary microphase and the drainage volume of the gas storage reservoir in the target drainage stage.

[0074] Step 107, based on the drainage volume corresponding to each sedimentary microphase in the gas storage reservoir at the target drainage stage and the gas storage space utilization rate of each sedimentary microphase, determine the additional storage capacity of the gas storage reservoir at the target drainage stage.

[0075] In the embodiment of the present application, the additional storage capacity of the gas storage reservoir in the target liquid discharge stage can be determined based on the following formula (2): G sci =[(V'c / B w )×λ c +(V' m / B w )×λ m +(V' s / B w )×λ s +V g +V' o / B o ] / 10000 / B g (2); In the above formula (2), G sci V' is the additional storage capacity of the gas storage during the target drainage stage, in billion cubic meters; c B is the discharge volume of the underwater diversion channel at the target discharge stage, in ten thousand cubic meters; w is the volume coefficient of water under the corresponding pressure of the discharged liquid; c V is the utilization rate of the gas storage space in the underwater diversion channel; m is the discharge volume of the estuary dam at the target discharge stage, in ten thousand cubic meters; m is the gas storage space utilization rate of the estuary dam; V s is the discharge volume of sheet sand at the target discharge stage, in ten thousand cubic meters; s V is the utilization rate of the gas storage space of the mat sand; g is the natural gas production volume during the drainage process, in ten thousand cubic meters; V' o is the crude oil production during the drainage process, in ten thousand cubic meters; B o B is the volume coefficient of crude oil at the corresponding pressure of the discharged liquid; g is the volume coefficient of gas at the upper limit pressure of the gas storage reservoir.

[0076] The following will describe the method for determining the gas storage capacity provided in the above embodiment of the present application in combination with specific examples. It should be understood that the following example is only a specific implementation method and does not represent an improper limitation on the solution of the present application.

[0077] Taking gas storage M as an example, gas storage M is a fault anticline structure sandwiched by two main faults. The structural high point is located near the middle of the fault block, dipping to the surroundings and axially northeast. The gas layer gas is mainly distributed in the high part of the fault block structure (such as Figure 3 As shown in the figure, it belongs to the fan delta front subfacies deposition. The original formation pressure is 28.7MPa, the crude oil recovery is 36.8%, the natural gas recovery is 80.3%, there are 11 water injection wells, mainly annular water injection in the middle and low parts, and the logging data before the construction of the reservoir confirmed that the strong water flooding layer accounted for 78.5%. In 2023, the gas storage M put into use 10 drainage wells to start drainage. By the end of September of that year, a total of 380,000 cubic meters of drainage had been accumulated, and the measured formation pressure was 16.7Mpa.

[0078] The specific calculation process of the gas storage capacity M is as follows: Step 1: Use core description and thin section identification, combined with rock electrical characteristics and hydrodynamic conditions, to establish a typical sedimentary profile of the reservoir section corresponding to the gas storage; analyze based on the sedimentary profile to obtain the lateral contact relationship of different microfacies sand bodies in the reservoir section corresponding to the gas storage, and finely characterize the distribution of the reservoir section corresponding to the gas storage (i.e., sedimentary microfacies plane map) and heterogeneity changes, such as Figure 4 shown.

[0079] Step 2: Further combine well logging and seismic data, apply stochastic modeling technology, and make a detailed description of the reservoir layer corresponding to the gas storage reservoir, so as to establish a three-dimensional geological model of the gas storage reservoir, and stereoscopically depict the development characteristics of the main sand bodies and porosity and permeability space in the gas storage reservoir, such as Figure 5 shown.

[0080] Step 3, obtain the oil and gas relative permeability data, oil and water relative permeability data, gas and water relative permeability data and PVT parameters from the core sample test, and establish a numerical simulation model of the gas storage reservoir based on the three-dimensional geological model. In addition, the numerical simulation model is fitted according to the production dynamic characteristics of the entire oil and gas development process of the reservoir segment corresponding to the gas storage reservoir, especially the injection water volume and production effectiveness. Then, combined with the test data of the final stage of development of the reservoir segment corresponding to the gas storage reservoir, the oil, gas and water distribution of the corresponding reservoir segment before the establishment of the gas storage reservoir is obtained. Taking the water distribution in the reservoir segment as an example, Figure 6 and Figure 7 The distribution of water in the reservoir layer corresponding to the gas storage is shown, among which, Figure 6 This is the numerical simulation result of the original water saturation of the corresponding reservoir layer of the gas storage before oil and gas development. Figure 7 These are the numerical simulation results of water saturation before the establishment of the gas storage. By comparison, we can see the changes in water distribution in the reservoir layer corresponding to the gas storage.

[0081] Step 4, calculate the coefficient of variation of each sedimentary microphase reservoir for each drainage well in the corresponding area of ​​the gas storage reservoir, and use thickness-weighted average to calculate the coefficient of variation of each sedimentary microphase reservoir in the gas storage reservoir. Next, according to the sedimentary microphase division results of each drainage well, the thickness and average permeability of each sedimentary microphase reservoir in the gas storage reservoir are statistically analyzed. Then, the discharge volume of each drainage well is split to obtain the discharge volume of different sedimentary microphases, and then the discharge volume corresponding to each sedimentary microphase in the gas storage reservoir and the proportion of the discharge volume of each sedimentary microphase in the total discharge volume of the gas storage reservoir are obtained. The discharge volume corresponding to each sedimentary microphase in the gas storage reservoir and the proportion of the discharge volume of each sedimentary microphase in the total discharge volume of the gas storage reservoir are shown in Table 1: Table 1 Gas storage M discharge data

[0082] Step 5: Based on the full-diameter long core displacement experiment, determine the gas storage space utilization rate of each sedimentary microfacies. Specifically, the gas storage space utilization rate λ of the underwater distributary channel c =0.72, gas storage space utilization rate of the estuary dam λ m is 0.38, and the gas storage space utilization rate of the front edge sheet sand is λ s is 0.26.

[0083] Step 6, based on the numerical simulation model, it is obtained that the residual gas volume of the gas storage after the completion of oil and gas development is 2.65 million cubic meters, the final total discharge of the gas storage is 4.8 million cubic meters (that is, 4.8 million cubic meters of underground water are discharged), the natural gas production is 70 million cubic meters, and the crude oil production is 1.36 million tons. Based on the proportion of the discharge volume of each sedimentary microphase obtained above, it can be obtained that the discharge volume corresponding to the underwater diversion channel is 3.24 million cubic meters, the discharge volume corresponding to the estuary dam is 1.193 million cubic meters, and the discharge volume corresponding to the front sheet sand is 367,000 cubic meters. The lower limit pressure of the gas storage M is 8.0MPa and the upper limit pressure is 28.7MPa. The changes in the underground water storage in the gas storage M can be shown as follows Figure 8 shown.

[0084] Step 7: Based on the above formula (1), the maximum storage capacity of the gas storage is calculated to be 1.661 billion cubic meters. The residual gas volume of the gas storage after the completion of oil and gas development is not considered, that is, V is deleted from the above formula (1). e , we can get the corresponding increase in storage capacity when the gas storage reaches its maximum storage capacity, which is 57 million cubic meters.

[0085] Based on the same inventive concept, Fig. 9 As shown, Fig. 9 The structure block diagram of a gas storage reservoir capacity determination device according to an embodiment of the present application is schematically shown. In one embodiment, a gas storage reservoir capacity determination device 200 is provided, comprising a numerical simulation model construction module 210, an initial storage capacity determination module 220, a sedimentary microphase drainage volume determination module 230 and a storage capacity calculation module 240, wherein: A numerical simulation model building module 210 is used to build a numerical simulation model of the gas storage reservoir based on relative permeability data, PVT parameters and a three-dimensional geological model of the gas storage reservoir; An initial storage capacity determination module 220 is used to determine the residual gas volume of the gas storage after the oil and gas development is completed based on the numerical simulation model; The sedimentary microfacies drainage volume determination module 230 is used to determine the proportion of drainage volume from each sedimentary microfacies in the first drainage period based on the drainage volume corresponding to each drainage well in the first drainage period; based on the final drainage volume of the gas storage reservoir obtained by the numerical simulation model and the drainage volume proportion, determine the drainage volume from each sedimentary microfacies in the final drainage volume; The storage capacity calculation module 240 is used to determine the maximum storage capacity of the gas storage reservoir based on the residual gas volume in the gas storage reservoir after the completion of oil and gas development, the gas storage space utilization rate of each sedimentary microphase, the drainage volume from each sedimentary microphase in the final drainage volume, and the oil and gas production volume.

[0086] In one embodiment, the numerical simulation model building module 210 is used to build a three-dimensional geological model of the gas storage reservoir based on geological data.

[0087] In one embodiment, the numerical simulation model building module 210 is used to: Using core description and thin section identification, combined with rock electrical characteristics and hydrodynamic conditions, the sedimentary profile and plan distribution of the gas storage reservoir are established; Based on the sedimentary profile and the planar distribution, reservoir sedimentary microfacies characteristics are obtained; Based on the reservoir sedimentary microfacies characteristics, combined with logging data and seismic data, a three-dimensional geological model of the gas storage reservoir is established.

[0088] In one embodiment, the relative permeability data includes oil-gas relative permeability data, oil-water relative permeability data, and gas-water relative permeability data; The method of establishing a numerical simulation model of a gas storage reservoir based on relative permeability data, PVT parameters and a three-dimensional geological model of the gas storage reservoir comprises: A numerical simulation model of the gas storage reservoir is established based on the oil and gas relative permeability data, oil and water relative permeability data, gas and water relative permeability data, PVT parameters and the three-dimensional geological model of the gas storage reservoir.

[0089] In one embodiment, oil-gas relative permeability data, oil-water relative permeability data, gas-water relative permeability data and PVT parameters are obtained based on core testing.

[0090] In one embodiment, the numerical simulation model building module 210 is further used to fit the numerical simulation model based on production dynamic characteristics during oil and gas development in a gas storage reservoir.

[0091] In one embodiment, the production dynamic characteristics include water injection layer, water injection volume and production effectiveness.

[0092] In one embodiment, the sedimentary microfacies drainage volume determination module 230 is used to determine, for each of the drainage wells, the drainage volume from each sedimentary microfacies in the drainage volume corresponding to the first drainage period of the drainage well; According to the drainage volume from each sedimentary microphase in the drainage volume corresponding to each drainage well in the first drainage period, the proportion of the drainage volume from each sedimentary microphase in the first drainage period is determined.

[0093] In one embodiment, the oil and gas production includes the natural gas production during the drainage process and the crude oil production during the drainage process. The storage capacity calculation module 240 is used to determine the maximum storage capacity of the gas storage reservoir based on the residual gas volume in the gas storage reservoir after the completion of oil and gas development, the gas storage space utilization rate of each sedimentary microphase, the drainage volume from each sedimentary microphase in the final total drainage volume, the natural gas production during the drainage process, and the crude oil production during the drainage process.

[0094] In one embodiment, the sedimentary microfacies include underwater distributary channels, estuary bars and sheet sands, and the storage capacity calculation module 240 is used to determine the maximum storage capacity of the gas storage based on the following formula: G sc =[V e +(V c / B w )×λ c +(V m / B w )×λ m +(V s / B w )×λ s +V g +(V o / B o )] / 10000 / B g ; Among them, G sc V is the maximum storage capacity of the gas storage facility, in billion cubic meters; e V is the residual gas volume in the gas storage after the completion of oil and gas development, in ten thousand cubic meters; c B is the amount of liquid discharged from the underwater diversion channel in the total final discharge, in ten thousand cubic meters; w is the volume coefficient of water under the corresponding pressure of the discharged liquid; c V is the utilization rate of the gas storage space in the underwater diversion channel; m is the discharge volume from the estuary dam in the final total discharge volume, in ten thousand cubic meters; m is the gas storage space utilization rate of the estuary dam; V s is the amount of liquid discharged from the sheet sand in the final total liquid discharge, in ten thousand cubic meters; s V is the utilization rate of the gas storage space of the mat sand; gV is the natural gas production volume during the drainage process, in ten thousand cubic meters; o is the crude oil production during the drainage process, in ten thousand cubic meters; B o B is the volume coefficient of crude oil at the corresponding pressure of the discharged liquid; g is the volume coefficient of gas at the upper limit pressure of the gas storage reservoir.

[0095] In one embodiment, the deposition microphase drainage volume determination module 230 is also used to determine the drainage volumes corresponding to each deposition microphase in the gas storage reservoir at the target drainage stage; the storage capacity calculation module 240 is also used to determine the newly added storage capacity of the gas storage reservoir at the target drainage stage based on the drainage volumes corresponding to each deposition microphase in the gas storage reservoir at the target drainage stage and the gas storage space utilization rate of each deposition microphase.

[0096] In one embodiment, the target drainage stage is the drainage stage that has occurred in the gas storage reservoir, and the sedimentary microphase drainage volume determination module 230 is used to determine the drainage volume corresponding to each sedimentary microphase in the gas storage reservoir in the target drainage stage based on the drainage volume corresponding to each drainage well in the target drainage stage.

[0097] In one embodiment, the target drainage stage is a drainage stage that has not occurred in the gas storage reservoir, and the sedimentary microphase drainage volume determination module 230 is used to predict the drainage volume of the gas storage reservoir in the target drainage stage based on the numerical simulation model; according to the drainage volume ratio and the drainage volume of the gas storage reservoir in the target drainage stage, determine the drainage volume corresponding to each sedimentary microphase in the gas storage reservoir in the target drainage stage.

[0098] In one embodiment, the sedimentary microfacies include underwater distributary channels, estuary bars and sheet sands, and the storage capacity calculation module 240 is used to determine the additional storage capacity of the gas storage reservoir in the target drainage stage based on the following formula: G sci =[(V' c / B w )×λ c +(V' m / B w )×λ m +(V' s / B w )×λ s +V g +V' o / B o ] / B g ; Among them, G sci V' is the additional storage capacity of the gas storage during the target drainage stage, in billion cubic meters; c B is the discharge volume of the underwater diversion channel at the target discharge stage, in ten thousand cubic meters; wis the volume coefficient of water under the corresponding pressure of the discharged liquid; c V is the utilization rate of the gas storage space in the underwater diversion channel; m is the discharge volume of the estuary dam at the target discharge stage, in ten thousand cubic meters; m is the gas storage space utilization rate of the estuary dam; V s is the discharge volume of sheet sand at the target discharge stage, in ten thousand cubic meters; s V is the utilization rate of the gas storage space of the mat sand; g is the natural gas production volume during the drainage process, in cubic meters; V' o is the crude oil production during the drainage process, in ten thousand cubic meters; B o B is the volume coefficient of crude oil at the corresponding pressure of the discharged liquid; g is the volume coefficient of gas at the upper limit pressure of the gas storage reservoir.

[0099] The gas storage reservoir capacity determination device includes a processor and a memory. The above-mentioned numerical simulation model construction module 210, initial storage capacity determination module 220, sedimentary microphase drainage volume determination module 230 and storage capacity calculation module 240 are all stored in the memory as program units, and the processor executes the above-mentioned program modules stored in the memory to implement corresponding functions.

[0100] The processor contains a kernel, which calls the corresponding program unit from the memory. There can be one or more kernels, and the kernel parameters can be adjusted to achieve fast and efficient calculations at the full chip scale.

[0101] The memory may include non-permanent memory in a computer-readable medium, random access memory (RAM) and / or non-volatile memory, such as read-only memory (ROM) or flash RAM, and the memory includes at least one memory chip.

[0102] An embodiment of the present application provides a machine-readable storage medium on which a program is stored. When the program is executed by a processor, the above-mentioned method for determining the storage capacity of a gas storage reservoir is implemented.

[0103] In one embodiment, a computer device is provided. The computer device may be a terminal, and its internal structure diagram may be as follows: Fig.10As shown. The computer device includes a processor A01, a network interface A02, a display screen A04, an input device A05 and a memory (not shown in the figure) connected through a system bus. Among them, the processor A01 of the computer device is used to provide computing and control capabilities. The memory of the computer device includes an internal memory A03 and a non-volatile storage medium A06. The non-volatile storage medium A06 stores an operating system B01 and a computer program B02. The internal memory A03 provides an environment for the operation of the operating system B01 and the computer program B02 in the non-volatile storage medium A06. The network interface A02 of the computer device is used to communicate with an external terminal through a network connection. When the computer program is executed by the processor A01, a method for determining the storage capacity of a gas storage reservoir is implemented. The display screen A04 of the computer device can be a liquid crystal display screen or an electronic ink display screen, and the input device A05 of the computer device can be a touch layer covered on the display screen, or a key, trackball or touchpad set on the computer device housing, or an external keyboard, touchpad or mouse, etc.

[0104] Those skilled in the art will understand that Fig.10 The structure shown in the figure is only a block diagram of a part of the structure related to the solution of the present application, and does not constitute a limitation on the computer device to which the solution of the present application is applied. The specific computer device may include more or fewer components than those shown in the figure, or combine certain components, or have a different arrangement of components.

[0105] In one embodiment, the gas storage reservoir capacity determination device provided in the present application can be implemented in the form of a computer program. The computer program can be Fig.10 The computer device shown in the figure is run on the computer device. The memory of the computer device can store various program modules that constitute the construction task intelligent scheduling device, such as: Fig. 9 The numerical simulation model building module 210, the initial storage capacity determination module 220, the sedimentary microphase drainage volume determination module 230 and the storage capacity calculation module 240 are shown. The computer program composed of each program module enables the processor to execute the steps of the gas storage capacity determination method of each embodiment of the present application described in this specification.

[0106] Fig.10 The computer device shown can be Fig. 9 The numerical simulation model building module 210, the initial storage capacity determination module 220, the sedimentary microphase drainage volume determination module 230 and the storage capacity calculation module 240 in the gas storage storage capacity determination device shown execute the method.

[0107] The embodiment of the present application provides a device, which includes a processor, a memory, and a program stored in the memory and executable on the processor. When the processor executes the program, the following steps are implemented: Based on the relative permeability data, PVT parameters and the three-dimensional geological model of the gas storage reservoir, a numerical simulation model of the gas storage reservoir is established; based on the numerical simulation model, the residual gas volume of the gas storage reservoir after the completion of oil and gas development is determined; Based on the discharge volumes of the respective drainage wells in the first drainage period, determining the proportion of the discharge volumes from each sedimentary microfacies in the first drainage period; Based on the final total discharge volume of the gas storage and the proportion of the discharge volume simulated by the numerical simulation model, determining the discharge volume from each sedimentary microfacies in the final total discharge volume; The maximum storage capacity of the gas storage reservoir is determined based on the residual gas volume in the gas storage reservoir after the completion of oil and gas development, the gas storage space utilization rate of each sedimentary microphase, the drainage volume from each sedimentary microphase in the final total drainage volume, and the oil and gas production volume.

[0108] In one embodiment, the method further comprises: establishing a three-dimensional geological model of the gas storage reservoir based on geological data.

[0109] In one embodiment, the three-dimensional geological model of the gas storage reservoir is established based on geological data, including: Using core description and thin section identification, combined with rock electrical characteristics and hydrodynamic conditions, the sedimentary profile and plan distribution of the gas storage reservoir are established; Based on the sedimentary profile and the planar distribution, reservoir sedimentary microfacies characteristics are obtained; Based on the reservoir sedimentary microfacies characteristics, combined with logging data and seismic data, a three-dimensional geological model of the gas storage reservoir is established.

[0110] In one embodiment, the relative permeability data includes oil-gas relative permeability data, oil-water relative permeability data, and gas-water relative permeability data; The method of establishing a numerical simulation model of a gas storage reservoir based on relative permeability data, PVT parameters and a three-dimensional geological model of the gas storage reservoir comprises: A numerical simulation model of the gas storage reservoir is established based on the oil and gas relative permeability data, oil and water relative permeability data, gas and water relative permeability data, PVT parameters and the three-dimensional geological model of the gas storage reservoir.

[0111] In one embodiment, the method further comprises: obtaining oil-gas relative permeability data, oil-water relative permeability data, gas-water relative permeability data and PVT parameters based on core testing.

[0112] In one embodiment, after establishing the numerical simulation model of the gas storage, the method further comprises: fitting the numerical simulation model based on production dynamic characteristics during oil and gas development of the gas storage.

[0113] In one embodiment, the production dynamic characteristics include water injection layer, water injection volume and production effectiveness.

[0114] In one embodiment, determining the proportion of drainage volume from each sedimentary microphase during the first drainage period includes: For each of the drainage wells, determining the drainage volume from each sedimentary microfacies in the drainage volume corresponding to the first drainage period of the drainage well; According to the drainage volume from each sedimentary microphase in the drainage volume corresponding to each drainage well in the first drainage period, the proportion of the drainage volume from each sedimentary microphase in the first drainage period is determined.

[0115] In one embodiment, the oil and gas production volume includes the natural gas production volume during the liquid discharge process and the crude oil production volume during the liquid discharge process; The maximum storage capacity of the gas storage is determined based on the residual gas volume of the gas storage after the completion of oil and gas development, the gas storage space utilization rate of each sedimentary microphase, the drainage volume from each sedimentary microphase in the final drainage volume, and the oil and gas production volume, including: The maximum storage capacity of the gas storage reservoir is determined based on the residual gas volume in the gas storage reservoir after the completion of oil and gas development, the gas storage space utilization rate of each sedimentary microphase, the drainage volume from each sedimentary microphase in the total final drainage volume, the natural gas production during the drainage process, and the crude oil production during the drainage process.

[0116] In one embodiment, the sedimentary microfacies include underwater distributary channels, estuary bars and sheet sands, and the maximum storage capacity of the gas storage reservoir is determined based on the following formula: G sc =[V e +(V c / B w )×λ c +(V m / B w )×λ m +(V s / B w )×λ s +V g +(V o / B o )] / 10000 / B g ; Among them, G sc V is the maximum storage capacity of the gas storage facility, in billion cubic meters; e V is the residual gas volume in the gas storage after the completion of oil and gas development, in ten thousand cubic meters; c B is the amount of liquid discharged from the underwater diversion channel in the total final discharge, in ten thousand cubic meters; w is the volume coefficient of water under the corresponding pressure of the discharged liquid; cV is the utilization rate of the gas storage space in the underwater diversion channel; m is the discharge volume from the estuary dam in the final total discharge volume, in ten thousand cubic meters; m is the gas storage space utilization rate of the estuary dam; V s is the amount of liquid discharged from the sheet sand in the final total liquid discharge, in ten thousand cubic meters; s V is the utilization rate of the gas storage space of the mat sand; g V is the natural gas production volume during the drainage process, in ten thousand cubic meters; o is the crude oil production during the drainage process, in ten thousand cubic meters; B o B is the volume coefficient of crude oil at the corresponding pressure of the discharged liquid; g is the volume coefficient of gas at the upper limit pressure of the gas storage reservoir.

[0117] In one embodiment, the method further comprises: Determine the drainage volume corresponding to each sedimentary microfacies in the gas storage reservoir at the target drainage stage; Based on the drainage volume corresponding to each sedimentary microphase in the gas storage reservoir at the target drainage stage and the gas storage space utilization rate of each sedimentary microphase, the additional storage capacity of the gas storage reservoir at the target drainage stage is determined.

[0118] In one embodiment, the target drainage stage is a drainage stage that has occurred in the gas storage reservoir, and determining the drainage amounts corresponding to the respective sedimentary microphases in the gas storage reservoir at the target drainage stage includes: Based on the drainage volume of each drainage well at the target drainage stage, the drainage volume of each sedimentary microfacies in the gas storage reservoir at the target drainage stage is determined.

[0119] In one embodiment, the target drainage stage is a drainage stage that has not occurred in the gas storage reservoir, and the determining of the drainage amount corresponding to each sedimentary microphase in the gas storage reservoir in the target drainage stage includes: predicting the drainage amount of the gas storage reservoir in the target drainage stage based on the numerical simulation model; According to the liquid discharge ratio and the liquid discharge volume of the gas storage reservoir at the target liquid discharge stage, the liquid discharge volumes corresponding to the respective sedimentary microfacies in the gas storage reservoir at the target liquid discharge stage are determined.

[0120] In one embodiment, the sedimentary microfacies include underwater distributary channels, estuary bars and sheet sands, and the additional storage capacity of the gas storage reservoir at the target drainage stage is determined based on the following formula: G sci =[(V' c / B w )×λ c +(V' m / B w )×λ m +(V' s / B w )×λs +V g +V' o / B o ] / B g ; Among them, G sci V' is the additional storage capacity of the gas storage during the target drainage stage, in billion cubic meters; c B is the discharge volume of the underwater diversion channel at the target discharge stage, in ten thousand cubic meters; w is the volume coefficient of water under the corresponding pressure of the discharged liquid; c V is the utilization rate of the gas storage space in the underwater diversion channel; m is the discharge volume of the estuary dam at the target discharge stage, in ten thousand cubic meters; m is the gas storage space utilization rate of the estuary dam; V s is the discharge volume of sheet sand at the target discharge stage, in ten thousand cubic meters; s V is the utilization rate of the gas storage space of the mat sand; g is the natural gas production volume during the drainage process, in ten thousand cubic meters; V' o is the crude oil production during the drainage process, in ten thousand cubic meters; B o B is the volume coefficient of crude oil at the corresponding pressure of the discharged liquid; g is the volume coefficient of gas at the upper limit pressure of the gas storage reservoir.

[0121] Those skilled in the art will appreciate that the embodiments of the present application may be provided as methods, systems, or computer program products. Therefore, the present application may adopt the form of a complete hardware embodiment, a complete software embodiment, or an embodiment combining software and hardware. Moreover, the present application may adopt the form of a computer program product implemented on one or more computer-usable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) containing computer-usable program codes.

[0122] The present application is described with reference to the flowcharts and / or block diagrams of the methods, devices (systems), and computer program products according to the embodiments of the present application. It should be understood that each process and / or box in the flowchart and / or block diagram, as well as the combination of the processes and / or boxes in the flowchart and / or block diagram, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, a special-purpose computer, an embedded processor, or other programmable data processing device to generate a machine, so that the instructions executed by the processor of the computer or other programmable data processing device generate instructions for implementing the processes in the flowchart and / or block diagram. Figure 1 A process or multiple processes and / or boxes Figure 1 A device that provides the functions specified in a block or multiple blocks.

[0123] These computer program instructions may also be stored in a computer-readable memory capable of directing a computer or other programmable data processing device to operate in a specific manner, so that the instructions stored in the computer-readable memory produce an article of manufacture comprising an instruction device, which implements the process Figure 1 A process or multiple processes and / or boxes Figure 1 A function specified in one or more boxes.

[0124] These computer program instructions can also be loaded onto a computer or other programmable data processing device so that a series of operating steps are executed on the computer or other programmable device to produce a computer-implemented process, thereby providing instructions for implementing the process. Figure 1 A process or multiple processes and / or boxes Figure 1 The steps for the functions specified in one or more boxes.

[0125] In a typical configuration, a computing device includes one or more processors (CPU), input / output interfaces, network interfaces, and memory.

[0126] The memory may include non-permanent memory in a computer-readable medium, random access memory (RAM) and / or non-volatile memory in the form of read-only memory (ROM) or flash RAM. The memory is an example of a computer-readable medium.

[0127] Computer readable media include permanent and non-permanent, removable and non-removable media, and can be implemented by any method or technology to store information. Information can be computer readable instructions, data structures, program modules or other data. Examples of computer storage media include, but are not limited to, phase change memory (PRAM), static random access memory (SRAM), dynamic random access memory (DRAM), other types of random access memory (RAM), read-only memory (ROM), electrically erasable programmable read-only memory (EEPROM), flash memory or other memory technology, compact disk read-only memory (CD-ROM), digital versatile disk (DVD) or other optical storage, magnetic cassettes, magnetic tape magnetic disk storage or other magnetic storage devices or any other non-transmission media that can be used to store information that can be accessed by a computing device. As defined herein, computer readable media does not include temporary computer readable media (transitory media), such as modulated data signals and carrier waves.

[0128] It should also be noted that the terms "include", "comprises" or any other variations thereof are intended to cover non-exclusive inclusion, so that a process, method, commodity or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, commodity or device. In the absence of more restrictions, the elements defined by the sentence "comprises a ..." do not exclude the existence of other identical elements in the process, method, commodity or device including the elements.

[0129] The above are only embodiments of the present application and are not intended to limit the present application. For those skilled in the art, the present application may have various changes and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application should be included within the scope of the claims of the present application.

Claims

1. A method for determining the storage capacity of a gas storage reservoir, characterized in that: The method comprises: Based on the relative permeability data, PVT parameters and the three-dimensional geological model of the gas storage reservoir, a numerical simulation model of the gas storage reservoir is established; based on the numerical simulation model, the residual gas volume of the gas storage reservoir after the completion of oil and gas development is determined; Based on the discharge volumes of the respective drainage wells in the first drainage period, determining the proportion of the discharge volumes from each sedimentary microfacies in the first drainage period; Based on the final total discharge volume of the gas storage and the proportion of the discharge volume simulated by the numerical simulation model, determining the discharge volume from each sedimentary microfacies in the final total discharge volume; The maximum storage capacity of the gas storage reservoir is determined based on the residual gas volume in the gas storage reservoir after the completion of oil and gas development, the gas storage space utilization rate of each sedimentary microphase, the drainage volume from each sedimentary microphase in the final total drainage volume, and the oil and gas production volume.

2. The method for determining the storage capacity of a gas storage reservoir according to claim 1, characterized in that: The method further comprises: establishing a three-dimensional geological model of the gas storage reservoir according to the geological data.

3. The method for determining the storage capacity of a gas storage reservoir according to claim 2, characterized in that: The three-dimensional geological model of the gas storage reservoir is established based on geological data, including: Using core description and thin section identification, combined with rock electrical characteristics and hydrodynamic conditions, the sedimentary profile and plan distribution of the gas storage reservoir are established; Based on the sedimentary profile and the planar distribution, reservoir sedimentary microfacies characteristics are obtained; Based on the reservoir sedimentary microfacies characteristics, combined with logging data and seismic data, a three-dimensional geological model of the gas storage reservoir is established.

4. The method for determining the storage capacity of a gas storage reservoir according to claim 1, characterized in that: The relative permeability data includes oil-gas relative permeability data, oil-water relative permeability data and gas-water relative permeability data; The method of establishing a numerical simulation model of a gas storage reservoir based on relative permeability data, PVT parameters and a three-dimensional geological model of the gas storage reservoir comprises: A numerical simulation model of the gas storage reservoir is established based on the oil and gas relative permeability data, oil and water relative permeability data, gas and water relative permeability data, PVT parameters and the three-dimensional geological model of the gas storage reservoir.

5. The method for determining the gas storage capacity according to claim 4, characterized in that: The method further comprises: obtaining oil-gas relative permeability data, oil-water relative permeability data, gas-water relative permeability data and PVT parameters based on core testing.

6. The method for determining the gas storage capacity according to claim 1, characterized in that: After the numerical simulation model of the gas storage is established, the method further comprises: fitting the numerical simulation model based on production dynamic characteristics during oil and gas development of the gas storage.

7. The method for determining the gas storage capacity according to claim 6, characterized in that: The production dynamic characteristics include water injection layer, water injection volume and production effectiveness.

8. The method for determining the gas storage capacity according to claim 1, characterized in that: The determining the proportion of the drainage volume from each sedimentary microfacies during the first drainage period includes: For each of the drainage wells, determining the drainage volume from each sedimentary microfacies in the drainage volume corresponding to the first drainage period of the drainage well; According to the drainage volume from each sedimentary microphase in the drainage volume corresponding to each drainage well in the first drainage period, the proportion of the drainage volume from each sedimentary microphase in the first drainage period is determined.

9. The method for determining the storage capacity of a gas storage reservoir according to claim 1, characterized in that: The oil and gas production volume includes the natural gas production volume during the liquid discharge process and the crude oil production volume during the liquid discharge process; The maximum storage capacity of the gas storage is determined based on the residual gas volume of the gas storage after the completion of oil and gas development, the gas storage space utilization rate of each sedimentary microphase, the drainage volume from each sedimentary microphase in the final drainage volume, and the oil and gas production volume, including: The maximum storage capacity of the gas storage reservoir is determined based on the residual gas volume in the gas storage reservoir after the completion of oil and gas development, the gas storage space utilization rate of each sedimentary microphase, the drainage volume from each sedimentary microphase in the total final drainage volume, the natural gas production during the drainage process, and the crude oil production during the drainage process.

10. The method for determining the storage capacity of a gas storage reservoir according to claim 9, characterized in that: The sedimentary microfacies include underwater distributary channels, estuary bars and sheet sands. The maximum storage capacity of the gas storage is determined based on the following formula: G sc =[V e +(V c / B w )×λ c +(V m / B w )×λ m +(V s / B w )×λ s +V g +(V o / B o )] / 10000 / B g ; Among them, G sc V is the maximum storage capacity of the gas storage facility, in billion cubic meters; e V is the residual gas volume in the gas storage after the completion of oil and gas development, in ten thousand cubic meters; c B is the amount of liquid discharged from the underwater diversion channel in the total final discharge, in ten thousand cubic meters; w is the volume coefficient of water under the corresponding pressure of the discharged liquid; c V is the utilization rate of the gas storage space in the underwater diversion channel; m is the discharge volume from the estuary dam in the final total discharge volume, in ten thousand cubic meters; m is the gas storage space utilization rate of the estuary dam; V s is the amount of liquid discharged from the sheet sand in the final total liquid discharge, in ten thousand cubic meters; s V is the utilization rate of the gas storage space of the mat sand; g V is the natural gas production volume during the drainage process, in ten thousand cubic meters; o is the crude oil production during the drainage process, in ten thousand cubic meters; B o B is the volume coefficient of crude oil at the corresponding pressure of the discharged liquid; g is the volume coefficient of gas at the upper limit pressure of the gas storage reservoir.

11. The method for determining the storage capacity of a gas storage reservoir according to claim 1, characterized in that: The method further comprises: Determine the drainage volume corresponding to each sedimentary microfacies in the gas storage reservoir at the target drainage stage; Based on the drainage volume corresponding to each sedimentary microphase in the gas storage reservoir at the target drainage stage and the gas storage space utilization rate of each sedimentary microphase, the additional storage capacity of the gas storage reservoir at the target drainage stage is determined.

12. The method for determining the storage capacity of a gas storage reservoir according to claim 11, characterized in that: The target drainage stage is the drainage stage that has occurred in the gas storage reservoir, and the step of determining the drainage volume corresponding to each sedimentary microfacies in the gas storage reservoir at the target drainage stage includes: Based on the drainage volume of each drainage well at the target drainage stage, the drainage volume of each sedimentary microfacies in the gas storage reservoir at the target drainage stage is determined.

13. The method for determining the storage capacity of a gas storage reservoir according to claim 11, characterized in that: The target drainage stage is a drainage stage that has not occurred in the gas storage reservoir, and the determining of the drainage volume corresponding to each sedimentary microphase in the gas storage reservoir in the target drainage stage includes: predicting the drainage volume of the gas storage reservoir in the target drainage stage based on the numerical simulation model; According to the liquid discharge ratio and the liquid discharge volume of the gas storage reservoir at the target liquid discharge stage, the liquid discharge volumes corresponding to the respective sedimentary microfacies in the gas storage reservoir at the target liquid discharge stage are determined.

14. The method for determining the storage capacity of a gas storage reservoir according to claim 11, characterized in that: The various sedimentary microfacies include underwater distributary channels, estuary bars and sheet sands. The additional storage capacity of the gas storage reservoir at the target drainage stage is determined based on the following formula: G sci =[(V’ c / B w )×λ c +(V’ m / B w )×λ m +(V’ s / B w )×λ s +V g +V’ o / B o ] / 10000 / B g ; Among them, G sci V' is the additional storage capacity of the gas storage during the target drainage stage, in billion cubic meters; c B is the discharge volume of the underwater diversion channel at the target discharge stage, in ten thousand cubic meters; w is the volume coefficient of water under the corresponding pressure of the discharged liquid; c V is the utilization rate of the gas storage space in the underwater diversion channel; m is the discharge volume of the estuary dam at the target discharge stage, in ten thousand cubic meters; m is the gas storage space utilization rate of the estuary dam; V s is the discharge volume of sheet sand at the target discharge stage, in ten thousand cubic meters; s V is the utilization rate of the gas storage space of the mat sand; g is the natural gas production volume during the drainage process, in ten thousand cubic meters; V' o is the crude oil production during the drainage process, in ten thousand cubic meters; B o B is the volume coefficient of crude oil at the corresponding pressure of the discharged liquid; g is the volume coefficient of gas at the upper limit pressure of the gas storage reservoir.

15. A device for determining the storage capacity of a gas storage reservoir, characterized in that: include: A numerical simulation model building module is used to build a numerical simulation model of the gas storage reservoir based on relative permeability data, PVT parameters and a three-dimensional geological model of the gas storage reservoir; An initial storage capacity determination module is used to determine the residual gas volume of the gas storage after the oil and gas development is completed based on the numerical simulation model; A sedimentary microfacies drainage volume determination module, for determining the drainage volume proportion from each sedimentary microfacies in the first drainage period based on the drainage volume of each drainage well in the first drainage period; Based on the final total discharge volume of the gas storage and the proportion of the discharge volume simulated by the numerical simulation model, determining the discharge volume from each sedimentary microfacies in the final total discharge volume; The storage capacity calculation module is used to determine the maximum storage capacity of the gas storage reservoir based on the residual gas volume in the gas storage reservoir after the completion of oil and gas development, the gas storage space utilization rate of each sedimentary microphase, the drainage volume from each sedimentary microphase in the final total drainage volume, and the oil and gas production volume.

16. The gas storage reservoir capacity determination device according to claim 15, characterized in that: The numerical simulation model building module is also used to fit the numerical simulation model based on the production dynamic characteristics of the oil and gas development process of the gas storage after the numerical simulation model of the gas storage is established.

17. The gas storage reservoir capacity determination device according to claim 15, characterized in that: The sediment microphase discharge volume determination module is used for: For each of the drainage wells, determining the drainage volume from each sedimentary microfacies in the drainage volume corresponding to the first drainage period of the drainage well; According to the drainage volume from each sedimentary microphase in the drainage volume corresponding to each drainage well in the first drainage period, the proportion of the drainage volume from each sedimentary microphase in the first drainage period is determined.

18. The gas storage reservoir capacity determination device according to claim 15, characterized in that: The sedimentary microphase drainage volume determination module is also used to determine the drainage volume corresponding to each sedimentary microphase in the gas storage reservoir at the target drainage stage; The storage capacity calculation module is also used to determine the newly added storage capacity of the gas storage reservoir at the target drainage stage based on the drainage volume corresponding to each sedimentary microphase in the gas storage reservoir at the target drainage stage and the gas storage space utilization rate of each sedimentary microphase.

19. A processor, characterized in that: The method is configured to execute the method for determining the storage capacity of a gas storage reservoir according to any one of claims 1 to 14.

20. A machine-readable storage medium having instructions stored thereon, characterized in that: When the instruction is executed by a processor, the processor is configured to execute the method for determining the storage capacity of a gas storage reservoir according to any one of claims 1 to 14.

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