A method and device for constructing a gas reservoir area benefit evaluation model and related equipment

Abstract

The application discloses a kind of gas reservoir area benefit evaluation model construction method, device and related equipment, wherein the method can include: according to the reserve abundance of different types of gas reservoir area storage and seepage body, the function equation between the reservoir thickness of gas reservoir area, connected body area and connected body reserve is determined, then the discrete data in the analytical model and / or mechanism model is brought into function equation, and benefit evaluation model is constructed.The benefit evaluation model can comprehensively consider two factors of reservoir thickness and reservoir connectivity, combined with the single well benefit development cumulative gas production lower limit value determined by investment, the benefit development area can be accurately screened out, in actual use, benefit development construction area screening of large area containing large data body can be quickly carried out, the screening precision and efficiency are improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of natural gas development, and particularly relates to a construction method and device of a gas reservoir area benefit evaluation model and related equipment. BACKGROUND

[0002] Based on the understanding of the prior art, the inventors have long-term research on scientific and technological journal literature and patent documents, and believe that there are mainly three methods for screening the development area of the existing gas reservoir. The first method is mainly based on the research of reservoir development characteristics. For example, Xie Qi determines that the sedimentary facies, structural fractures and diagenesis are the three major controlling factors of the Feixianguan Formation reservoir in the area through comprehensive geological research, and predicts the favorable facies belt area and the favorable development area of oolitic beach reservoirs in combination with the latest 3D seismic results. The second method is mainly based on the optimization of the development area of the rich area. For example, Zhang Minglu et al. summarize the high-yield distribution law of the Jingbian Lower Paleozoic gas reservoir in Changqing Gas Field through comprehensive research of geology-seismic-gas reservoir engineering, which supports the screening of the rich area; Xie Dan analyzes the fracture development characteristics of Xujiahe 4 reservoir, and comprehensively predicts the Xujiahe 4 sandstone rich area in combination with the evaluation results of structure, reservoir development area and fractures; Lu Jia-chun et al. apply reservoir seismic AVO gas detection, reservoir fine description, and carry out the research on the distribution of effective reservoirs, gas-water distribution law and the screening of the rich area in combination with seismic, geological, logging and gas testing data; Jiao Xiaoni carries out the research on the seismic reservoir prediction and sedimentary microfacies characteristics in combination with the structure and stratigraphic distribution law of the research area, determines the development characteristics of the effective sand body in Su 54 block, understands the gas-water distribution law of the research area, carries out the research on the energy coefficient, analyzes the planar distribution law, and screens the development area of the rich area accordingly; Cheng Li-hua establishes a method for determining the rich area of low-permeability tight sandstone gas reservoir based on the modified reserve abundance. The third method considers the relationship between the gas well productivity and economic benefits, establishes the screening standard of the development area of the initial test production of gas wells, and screens the development area. For example, Liu Chuanxi et al. establish a set of quantitative selection and evaluation method for low-permeability lithologic gas reservoirs by using geological, logging, seismic and testing data, through multi-information constrained geological modeling, productivity and static parameter relationship research and technical and economic limit research, and establish a three-dimensional geological model of lithologic gas reservoir, a open flow capacity prediction model, a development economic limit and an evaluation standard for selecting the area, forming a set of dynamic and static combined quantitative selection and evaluation method for low-permeability lithologic gas reservoirs; Wang Jianguo defines the performance of organic carbon content, fracturing index, formation coefficient and high-quality shale thickness as gas testing index, and then screens the development effect of the reservoir in the work area by using the gas testing index, and screens the favorable area of the development of shale gas reservoir; Zhong Bing et al. select the effective reservoir thickness, reserve abundance and effective formation coefficient in combination with the dynamic and static characteristics and benefit evaluation parameters of the gas reservoir, establish the evaluation standard for the classification of the reservoir, and screen the favorable development of the gas reservoir on this basis. The three methods are divided into three levels. The first method is the first level, which comprehensively uses various data to represent the reservoir development characteristics, predicts the favorable area, and points out which places are the favorable area of the reservoir development and which places are the unfavorable area of the reservoir development. The second method is the screening of the rich area, which is one level more than the first method. In the favorable area of the reservoir development, it points out which places are relatively rich, and the high-quality reservoirs are thicker in the rich area.The third method considers economic benefits in the screening process of the enrichment area, uses economic indicators to evaluate the enrichment area, and classifies the development and production area, which has very important guiding significance in the actual development and production of gas reservoirs. SUMMARY

[0003] The inventors found that, in the prior art, the development effect of a gas well in a strong heterogeneous gas reservoir is mainly evaluated early by gas well productivity evaluation. The productivity evaluation of complex media is based on the understanding of reservoir characteristics, mainly around the fracture and cave type or pore type reservoir, and a new understanding of using a multiple medium model to evaluate the productivity of a gas well based on well test data. On October 15, 2019, the inventors proposed a method and device for analyzing the development effect of a gas well, with the publication number CN112668136A. However, the inventors found in actual production and application that, although the above-mentioned method for analyzing the development effect of a gas well can provide a good basis for early evaluation of the development effect of a strong heterogeneous gas well in a complex medium, and can better predict the development effect of a gas well and the development of the same type of well. However, it cannot accurately screen the development and production area for benefit development in this type of gas reservoir, that is, it cannot determine the specific range of blocks with economic benefits, especially for strong heterogeneous gas reservoirs, especially for marginal benefit gas reservoirs. The existing method has a single consideration factor, a large error in the representation result, and a poor application effect.

[0004] In view of the above problems, the present application is proposed to provide a method for constructing a gas reservoir area benefit evaluation model, a device and related equipment to overcome the above problems or at least partially solve the above problems.

[0005] In a first aspect, the embodiments of the present application provide a method for constructing a gas reservoir area benefit evaluation model, which can include:

[0006] According to the reserve abundance of different types of reservoirs and permeable bodies in the gas reservoir area, a functional equation between the reservoir thickness, the connected body area and the connected body reserves of the gas reservoir area is determined.

[0007] The discrete data preset in the analytical model and / or the mechanism model is brought into the functional equation to construct a benefit evaluation model.

[0008] Optionally, the method for constructing a benefit evaluation model by bringing the discrete data preset in the analytical model and / or the mechanism model into the functional equation can include:

[0009] The discrete data preset in the analytical model and / or the mechanism model is brought into the functional equation to obtain discrete benefit evaluation data.

[0010] The discrete benefit evaluation data is fitted to construct a benefit evaluation model.

[0011] Optionally, the method can further comprise: fusing the benefit evaluation model based on the analytical model and the benefit evaluation model based on the mechanism model to obtain a comprehensive benefit evaluation model of the gas reservoir area.

[0012] Optionally, the preset discrete data comprises: connected body reserves of the reservoir, a reservoir thickness ratio of the fracture-cave type reservoir to the cave type reservoir, a total reservoir thickness of the fracture-cave type reservoir to the cave type reservoir, a single well control radius ratio of the fracture-cave type reservoir to the cave type reservoir, and an initial production of the gas well.

[0013] Optionally, the method for determining the connected body area can comprise:

[0014] determining a fracture development density boundary value of the connected body based on dynamic and static data in the seismic interpretation data and / or the logging data;

[0015] determining the connected body area according to the fracture development density boundary value.

[0016] Optionally, the method can further comprise:

[0017] converting the thickness of the reservoirs of different types into effective thicknesses of the fracture-cave type reservoirs according to a pre-established equivalent conversion model;

[0018] determining the equivalent converted reserves abundance of the gas reservoir area according to the effective thicknesses of the fracture-cave type reservoirs.

[0019] In a second aspect, an embodiment of the present application provides a gas well development selection method, which can comprise: a benefit evaluation model constructed based on the method for constructing the benefit evaluation model of the gas reservoir area and a preset single well cumulative production threshold, and selecting a benefit development area range of the gas well development.

[0020] In a third aspect, an embodiment of the present application provides a construction device of a benefit evaluation model of a gas reservoir area, which can comprise:

[0021] a determination module configured to construct a function equation among reservoir thickness, connected body area and connected body reserves of the gas reservoir area according to reserves abundance of different types of reservoirs of the gas reservoir area;

[0022] a construction module configured to bring preset discrete data in the analytical model and / or the mechanism model into the function equation to construct a benefit evaluation model.

[0023] Optionally, the device can further comprise a fusion module.

[0024] The fusion module is configured to fuse the benefit evaluation model based on the analytical model and the benefit evaluation model based on the mechanism model to obtain a comprehensive benefit evaluation model of the gas reservoir area.

[0025] In a fourth aspect, an embodiment of the present application provides a gas well development selection device, which can include the benefit evaluation model construction device and the selection module of the third aspect.

[0026] The selection module is configured to select a range of the benefit development area of the gas well development based on the benefit evaluation model constructed by the benefit evaluation model construction device of the gas reservoir area and a preset single-well cumulative production threshold.

[0027] In a fifth aspect, an embodiment of the present application provides a computer readable storage medium having a computer program stored thereon, which, when executed by a processor, implements the benefit evaluation model construction method of the first aspect or the gas well development selection method of the third aspect.

[0028] In a sixth aspect, an embodiment of the present application provides a computer device including a memory, a processor, and a computer program stored on the memory and executable on the processor, wherein the processor implements the benefit evaluation model construction method of the first aspect or the gas well development selection method of the third aspect when executing the program.

[0029] The above technical solutions provided by the embodiments of the present application have at least the following beneficial effects:

[0030] The embodiments of the present application provide a benefit evaluation model construction method, device and related equipment of a gas reservoir area, wherein the method can include: determining a functional equation among reservoir thickness, connected body area and connected body reserves of the gas reservoir area according to reserve abundance of different types of reservoirs and permeable bodies in the gas reservoir area, and then bringing discrete data preset in an analytical model and / or a mechanism model into the functional equation to construct a benefit evaluation model. The benefit evaluation model can comprehensively consider two factors of reservoir thickness and reservoir connectivity, and can accurately screen out a benefit development area in combination with a lower limit value of single-well benefit development cumulative gas production determined by investment. In actual use, the benefit development construction area screening can be quickly performed on a large area containing a large data body, and the screening precision and efficiency are improved.

[0031] Other features and advantages of the present application will be set forth in the following description, and in part will become apparent to those skilled in the art from the following description, or can be learned by practice of the present application. The objects and other advantages of the present application can be achieved and obtained by the structure particularly pointed out in the written description, claims, and drawings.

[0032] The technical solutions of the present application will be further described in detail below with the aid of drawings and embodiments. Attached Figure Description

[0033] The accompanying drawings are provided to further illustrate the invention and form part of the specification. They are used in conjunction with embodiments of the invention to explain the invention and do not constitute a limitation thereof. In the drawings:

[0034] Figure 1 This is a flowchart illustrating the method for constructing a gas reservoir benefit assessment model provided in this embodiment of the invention.

[0035] Figure 2 This is a schematic diagram illustrating the specific process of implementing step S12 in the embodiments of the present invention;

[0036] Figure 3 This is a fluid diagram illustrating a specific construction method provided in an embodiment of the present invention;

[0037] Figure 4 This is a schematic diagram of the fitting curves between the equivalent reserves abundance and unobstructed flow rate of different types of gas wells provided in the embodiments of the present invention;

[0038] Figure 5 This is a schematic diagram of the benefit development model for solving analytical model parameters provided in this embodiment of the invention;

[0039] Figure 6 This is a schematic diagram of the benefit development model for solving the mechanism model parameters provided in this embodiment of the invention;

[0040] Figure 7 This is a schematic diagram of the benefit development model for solving the analytical model and mechanism model parameters provided in the embodiments of the present invention;

[0041] Figure 8 This is a schematic diagram of the integrated benefit development model after fusing the benefit development model obtained by solving the parameters of the analytical model and the mechanism model provided in this embodiment of the invention;

[0042] Figure 9 This is a schematic diagram illustrating the verification of a specific gas reservoir area provided in an embodiment of the present invention;

[0043] Figure 10 This is a schematic diagram illustrating the economic benefits of a specific gas reservoir area provided in an embodiment of the present invention;

[0044] Figure 11 This is a schematic diagram of the structure of the device for constructing the gas reservoir benefit assessment model provided in this embodiment of the invention. Detailed Implementation

[0045] Exemplary embodiments of the present disclosure will be described in greater detail below with reference to the accompanying drawings. While exemplary embodiments of the present disclosure are shown in the drawings, it is understood that the present disclosure can be embodied in various forms without being limited by the embodiments set forth herein. Rather, these embodiments are provided so that the present disclosure can be thoroughly and completely understood, and so that the scope of the present disclosure can be conveyed to those skilled in the art.

[0046] The method for constructing the benefit evaluation model provided in the embodiments of the present application is used for the benefit evaluation model constructed by the method to have important significance for the benefit development selection of the gas development stage, in particular, the strong heterogeneous low-quality reserves. Figure 1 As shown in the drawings, the method can include:

[0047] In step S11, a function equation is determined between the reservoir thickness, the connected body area and the connected body reserves of the gas reservoir area according to the reserve abundance of different types of reservoirs and permeable bodies in the gas reservoir area.

[0048] In the embodiments of the present application, the reservoirs and permeable bodies are divided into fracture-cave type, hole type and pore type according to the conventional logging, core photos, thin section photos and / or imaging logging data. For the strong heterogeneous gas reservoir, since the gas reservoir space includes pores, fractures, caves and other media, and the sizes of the reservoir space are different, the types of the reservoirs and permeable bodies are various, and the production of the gas well is relatively complex. Therefore, the division standards of different types of reservoirs and permeable bodies are established according to the core photos, imaging logging data and conventional logging data, the types of the reservoirs and permeable bodies in the effective reservoir section of the drilled well are divided into three types of fracture-cave type, hole type and pore type, and the embodiments of the present application provide a basis for the establishment of the equivalent conversion model through the division of different types of reservoirs and permeable bodies. The reserve abundance of different reservoirs and permeable bodies can be determined, and the development effect of the gas well and the development situation of the same type of well can be better predicted.

[0049] Further, in the embodiments of the present application, the development effect analysis of the gas well is performed according to the open flow capacity of different types of gas wells. Based on the equivalent conversion model, the thicknesses of different types of reservoirs and permeable bodies can be converted into the thickness of the fracture-cave type reservoir and permeable body. Specifically, the thickness of the hole type reservoir can be converted into the thickness of the pore type reservoir. After the equivalent conversion, it can be obtained that how much the effective gas supply reserves near the wellbore to the well bottom in the short hours of the test, and thus the equivalent conversion abundance can be calculated. The calculation formula (1) is as follows:

[0050]

[0051] In the formula, s' is the equivalent conversion reserve abundance;

[0052] h1 is the effective reservoir thickness of the fracture-cave type reservoir and permeable body;

[0053] h2 is the effective reservoir thickness of the hole type reservoir and permeable body;

[0054] h3 is the effective reservoir thickness of the pore type reservoir;

[0055] porosity of the fracture-vug type reservoir;

[0056] porosity of the vug type reservoir;

[0057] porosity of the fracture-pore type reservoir;

[0058] S g1 gas saturation of the fracture-vug type reservoir;

[0059] S g2 gas saturation of the vug type reservoir;

[0060] S g3 gas saturation of the fracture-pore type reservoir;

[0061] The inventor finds that the fracture-vug type, the vug type and the pore type reservoirs have different contribution abilities to the high and low of the test production of the gas well, the equivalent conversion formula can be understood as converting the vug type and the pore type reservoirs into the thickness of the fracture-vug type reservoir, and from the conversion formula of the three types of gas wells, it can be seen that the contribution rate of the thickness of the vug type reservoir and the thickness of the fracture-vug type reservoir is restricted by the formation factors of the gas reservoir area, that is, a constant multiple, therefore, the formula (2) can be used to represent the functional relationship between the reservoir thickness, the connected body area and the connected body reserves of the gas reservoir area:

[0062]

[0063] Wherein, H is the total thickness of the drilled fracture-vug type reservoir and the vug type reservoir (m); S is the connected body area (km 2 ); E is the connected body reserves (10 8 m 3 ); a, b, c and d are constants calculated when the model is applied. In the above functional equation in the formula (2), H, S and E are all variables, and a, b, c and d need to be calculated according to the reserves abundance of different types of reservoirs in different gas reservoir areas.

[0064] Step S12, the discrete data preset in the analytical model and / or the mechanism model is brought into the functional equation to construct the benefit evaluation model.

[0065] The discrete data (parameters) preset in the analytical model and the mechanism model in the embodiment of the application can refer to Table 1 below, and of course, can be adjusted according to the actual situation of the gas reservoir area, and the embodiment of the application does not make specific limitation thereto.

[0066] Table 1

[0067]

[0068] Specifically, the preset discrete data can include: a connected body reserve of the reservoir, a reservoir thickness ratio of the fracture-cave type reservoir to the cave type reservoir, a total reservoir thickness of the fracture-cave type reservoir to the cave type reservoir, a single well control radius ratio of the fracture-cave type reservoir to the cave type reservoir, and an initial production of the gas well.

[0069] In the embodiment of the present application, firstly, a function equation among the reservoir thickness, the connected body area and the connected body reserve of the gas reservoir area is determined based on the reserve abundance of different types of reservoirs in the gas reservoir area; then, the preset discrete data in the analytical model and / or the mechanism model is brought into the function equation to construct the benefit evaluation model. The benefit evaluation model can comprehensively consider the two factors of the reservoir thickness and the reservoir connectivity, and can accurately screen out the benefit development area in combination with the lower limit value of the single well benefit development cumulative gas production determined by the investment. In actual use, the benefit development construction area screening of a large area containing a large data body can be quickly performed, and the screening precision and efficiency are improved.

[0070] In one specific embodiment, the embodiment of the present application provides a construction method of a detailed benefit evaluation model of the gas reservoir area, as shown in Figure 2 , the method can include the following steps:

[0071] Step S21, according to the pre-established equivalent conversion model, the thickness of the pre-divided different types of reservoirs is converted into the effective thickness of the fracture-cave type reservoir.

[0072] In the embodiment of the present application, different types of reservoirs have differences in the initial testing production rate gas supply capacity of the well completion, as shown in Figure 3 , the open flow capacity (Qaof, unit: m 3 / d) of the gas well is proportional to the formation coefficient (KH, the product of the reservoir thickness and the permeability, unit: mD·m). Therefore, the thickness of different types of reservoirs can be weighted and converted according to the permeability, and the fracture-cave type reservoir thickness is converted, that is, the effective thickness of the drilled well can be calculated. This method is called equivalent conversion method. The equivalent conversion formula (3) is:

[0073] k1*H=k1*h1+k2*h2+k3*h3 Formula (3)

[0074] Wherein, k represents the permeability, h represents the thickness, 1, 2 and 3 respectively represent the fracture-cave type, the cave type and the pore type reservoir, and H represents the effective thickness after the equivalent conversion.

[0075] Step S22: Determine the equivalent converted reserve abundance of the gas reservoir area based on the effective thickness of the fractured-vuggy reservoir body.

[0076] In this step, the thickness of different types of reservoirs obtained in step S21 above is first converted into the effective thickness of fractured-vuggy reservoirs. The equivalent conversion of reserves abundance is calculated for fractured-vuggy, porous, and perforated gas wells respectively. Taking a specific gas reservoir area as an example, the equivalent conversion of reserves abundance calculation formulas for different types of gas wells can be obtained, as shown in formulas (4) to (6):

[0077]

[0078]

[0079]

[0080] Wherein, γ2 is the ratio of the permeability of the porous reservoir to that of the fractured-vuggy reservoir; γ3 is the ratio of the permeability of the porous reservoir to that of the fractured-vuggy reservoir.

[0081] Step S23: Determine the functional equations between reservoir thickness, interconnected area and interconnected reserves in the gas reservoir area based on the abundance of different types of reservoirs and permeable bodies in the gas reservoir area.

[0082] Taking the aforementioned specific gas reservoir area as an example, refer to Figure 4 As shown in the fitted curves of the relationship between the equivalent reserves abundance and the unobstructed flow rate of different types of gas wells, it can be seen that the contribution capacity of fractured, porous, and pore-type reservoirs to the test production of gas wells varies. The equivalent conversion formula can be understood as converting porous and pore-type reservoirs into the thickness of fractured reservoirs. From the conversion formulas of the three types of gas wells, it can be seen that the coefficient in front of the thickness of porous reservoirs is about 0.05, and the coefficient in front of the thickness of pore-type reservoirs is about 0.007. Since fractured and porous reservoirs are high-quality gas reservoirs, it can be understood that the production capacity contribution of a 20-meter porous reservoir is only equivalent to the production capacity contribution of a 1-meter fractured reservoir. Based on this, the relationship between reservoir thickness and connectivity area under the condition that the drilled reservoir is a fractured or porous reservoir can be deduced. That is, after the calculation of formula (2) in the above embodiment, it can be characterized by the following formula (7):

[0083]

[0084] Step S24: Substitute the preset discrete data from the analytical model and / or mechanistic model into the function equation to obtain discrete benefit evaluation data.

[0085] In this embodiment of the invention, after comprehensively considering the thickness H and the area S of the connected body, a benefit rating model can be established through analytical and mechanistic models, and actual blocks can be screened for development and production areas. In the actual production process of fractured-vuggy and porous reservoirs, the controlled reserves (E) of the reservoir permeability, the converted thickness ratio of fractured-vuggy and porous reservoirs, the sum of the thicknesses (H) of fractured-vuggy and porous reservoirs encountered in completed wells, and the ratio of the control radius of a single well in fractured-vuggy and porous reservoirs are all considered. In addition to the changes in single-well production (Q), referring to the parameters of 5280 analytical models and 24 mechanistic models designed in Table 1, a benefit evaluation model was established to obtain discrete benefit evaluation data.

[0086] Step S25: For discrete benefit assessment data, fit curves to construct a benefit assessment model.

[0087] In this embodiment of the invention, based on discrete benefit evaluation data, the equation obtained by fitting the benefit development model obtained from the analytical model solution is: S = 61.662 * H -1.157 ;

[0088] Based on discrete benefit assessment data, the equation obtained after fitting the benefit development model from the mechanistic model solution is: S = 59.164 * H -0.982 .

[0089] It should be noted here that R 2 Fit the relationship between the true values ​​and the scatter plot values.

[0090] Step S26: The benefit assessment model obtained based on the analytical model and the benefit assessment model obtained based on the mechanism model are fused to obtain a comprehensive benefit assessment model for the gas reservoir area.

[0091] In this embodiment of the invention, the equation for the comprehensive gas reservoir benefit assessment model obtained by fusing the benefit assessment model obtained based on the analytical model and the benefit assessment model obtained based on the mechanism model in step S25 is: S = 60.413 * H -1.07 .

[0092] This method is based on two types of data: reservoir thickness and fracture development degree interpreted by seismic analysis. According to the established benefit development evaluation model, it can quickly obtain the scope of benefit development zones in the study area. Compared with the background technology, it comprehensively considers two factors: reservoir thickness and reservoir connectivity. Combined with the lower limit of cumulative gas production per well determined by investment, it can accurately screen out benefit development zones. Furthermore, it can quickly screen large-area benefit development production zones containing large data volumes.

[0093] In another alternative embodiment, the area of ​​the connected volume is obtained based on seismic interpretation data and / or well logging data, and the specific determination method may include:

[0094] The boundary value of the reservoir fracture development density of the connected body is determined based on the dynamic and static data in the seismic interpretation data and / or well logging data; the area of ​​the connected body is determined based on the boundary value of the reservoir fracture development density.

[0095] In another, more specific example, this embodiment of the invention takes the Moxi 8 well area of ​​the Sinian Deng 4 gas reservoir in the Anyue gas field as an example. This well area is currently in the development evaluation stage. The Moxi 8 well area has proven reserves of 63.843 billion cubic meters and a proven gas-bearing area of ​​248 km². 2 The gas reservoir has low production levels after drilling and testing. During the exploration and evaluation phase, five wells were drilled, with an average unobstructed flow rate of only 83,000 cubic meters per day. During the development and evaluation phase, three development and evaluation wells were drilled, increasing the average unobstructed flow rate to 575,000 cubic meters per day through the use of highly deviated and horizontal wells. Overall, the Moxi 8 gas reservoir within the Sinian system exhibits strong reservoir heterogeneity, representing a low-quality reserve area and placing it on the edge of profitable development. Following the steps of this invention, firstly, equivalent conversion formulas for different types of gas well thickness were established using the equivalent conversion method. Then, through derivation, a mathematical model comprehensively considering reservoir thickness and connected volume area was established. Finally, through 5280 analytical models and 24 mechanistic models, a final model for selecting production areas that comprehensively considers reservoir thickness H and area S was established. Based on seismic interpretation data, three production areas were comprehensively selected, with an area of ​​157 km² and reserves of 34.23 billion cubic meters (Moxi 11 well area, area 21.17 km²). 2 The reserves are 4.68 billion cubic meters; the Moxi 19 well area covers 63.65 km². 2 The reserves are 16.32 billion cubic meters; the Moxi 8 well area covers 72.62 km². 2 (Reserves of 13.23 billion cubic meters). Combined with... Figure 10 As shown, based on the screening of development and production areas and combined with the effective well deployment model, a development evaluation well, Moxi 019-X1, was deployed in the Moxi 8 well area in 2019. This well was completed in August 2020, and on November 17, 2020, the tested production was 1.0624 million cubic meters, with a calculated unobstructed flow rate of 2.048 million cubic meters, achieving good development results. This, in turn, verifies the reliability of the efficient development and production area. (Refer to...) Figure 10 Darker colored areas are economically beneficial.

[0096] Based on the same inventive concept, this invention also provides a device for constructing a gas reservoir benefit assessment model, referring to... Figure 11 As shown, the device may include a determining module 11 and a building module 12; its working principle is as follows:

[0097] The determination module 11 is used to construct a functional equation between the reservoir thickness, the area of ​​the connected body and the reserves of the connected body in the gas reservoir area based on the reserve abundance of different types of reservoirs and permeable bodies in the gas reservoir area.

[0098] The construction module 12 brings preset discrete data in the analytical model and / or the mechanism model into the function equation to construct the benefit evaluation model.

[0099] In an optional embodiment, referring also to Figure 11 As shown in the figure, the device can further include a fusion module 13 configured to fuse the benefit evaluation model based on the analytical model and the benefit evaluation model based on the mechanism model to obtain a comprehensive benefit evaluation model of the gas reservoir area.

[0100] In another optional embodiment, the construction module 12 is specifically configured to bring the preset discrete data in the analytical model and / or the mechanism model into the function equation to obtain discrete benefit evaluation data, and further configured to construct a benefit evaluation model by fitting the discrete benefit evaluation data.

[0101] In another optional embodiment, the determination module 11 is further configured to determine the fracture development density boundary value of the reservoir body of the connected body based on the dynamic and static data in the seismic interpretation data and / or the logging data, and determine the area of the connected body according to the fracture development density boundary value.

[0102] Based on the same inventive concept, the embodiments of the present application further provide a gas well development selection method, which includes the benefit evaluation model constructed by the construction method of the benefit evaluation model of the reservoir area and a preset single-well cumulative production threshold value, and selecting the range of the benefit development area of the gas well development.

[0103] In the embodiments of the present application, the single-well drilling and completion investment and the ground investment are considered, and the single-well cumulative production of 240 million cubic meters of the Sinian gas reservoir can realize the benefit development. Under this precondition, the analytical model can establish a benefit development model by simulation and solution, and the mechanism model can also establish a benefit development model. By comprehensively considering the two methods, a comprehensive benefit development evaluation model can be obtained. According to the comprehensive benefit development evaluation model, the thickness H and the connected body area S of the fracture-vug and pore-hole reservoirs interpreted by the seismic interpretation in the research area can be combined to obtain the size and area of the benefit development area of the research area.

[0104] Based on the same inventive concept, the embodiments of the present application further provide a gas well development selection device, which includes the construction device of the benefit evaluation model of the gas reservoir area and a selection module.

[0105] The selection module is configured to select the range of the benefit development area of the gas well development based on the benefit evaluation model constructed by the construction device of the benefit evaluation model of the gas reservoir area and a preset single-well cumulative production threshold value.

[0106] Based on the same inventive concept, the embodiment of the present application further provides a computer readable storage medium, which stores a computer program, and the program is executed by a processor to implement the method for constructing the gas reservoir area benefit evaluation model or the method for selecting a gas well development area.

[0107] Based on the same inventive concept, the embodiment of the present application further provides a computer device, which comprises a memory, a processor and a computer program stored in the memory and executable on the processor, and the processor executes the program to implement the method for constructing the gas reservoir area benefit evaluation model or the method for selecting a gas well development area.

[0108] It should be noted that, since the principles of the problems solved by the devices, the medium and the computer device are similar to the foregoing method, the implementation of the devices, the medium and the computer device can refer to the implementation of the foregoing method, and the repeated parts will not be described herein.

[0109] Those skilled in the art should understand that the embodiments of the present application can be provided as a method, a system or a computer program product. Therefore, the present application can adopt a completely hardware embodiment, a completely software embodiment or an embodiment combining software and hardware aspects. Moreover, the present application can adopt a computer program product in the form of being implemented on one or more computer usable storage media (including but not limited to disk storage and optical storage, etc.) containing computer usable program codes.

[0110] The present application is described with reference to flowcharts and / or block diagrams of the method, device (system) and computer program product according to the embodiments of the present application. It should be understood that each flow and / or block in the flowcharts and / or block diagrams, and the combination of the flows and / or blocks in the flowcharts and / or block diagrams 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 produce a machine, so that the instructions executed by the processor of the computer or other programmable data processing device produce a device implemented in the flowcharts and / or block diagrams. Figure 1 one or more flows and / or blocks Figure 1 an apparatus that implements the function specified in the flow or the block.

[0111] These computer program instructions can also be stored in a computer readable storage medium that can direct the computer or other programmable data processing device to work in a specific manner, so that the instructions stored in the computer readable storage medium produce a product including instruction apparatus, which implements the flowcharts and / or block diagrams. Figure 1 one or more flows and / or blocks Figure 1 an apparatus that implements the function specified in the flow or the block.

[0112] These computer program instructions can also be loaded into a computer or other programmable data processing devices, so that a series of operational steps are performed on the computer or other programmable devices to generate computer-implemented processes, thus the instructions executed on the computer or other programmable devices provide processes for implementing the flow Figure 1 one or more flows and / or blocks Figure 1 one or more blocks or steps of the functions specified in the flow

[0113] Obviously, those skilled in the art can make various modifications and variations to the present application without departing from the spirit and scope of the present application. Thus, if these modifications and variations of the present application belong to the scope of the claims of the present application and their equivalent technologies, the present application also intends to include these modifications and variations.

Claims

1. A method for constructing a gas reservoir benefit assessment model, characterized in that, include: Based on a pre-established equivalent conversion model, the thickness of pre-classified different types of reservoirs is converted into the effective thickness of fractured-vuggy reservoirs; the formula for the equivalent conversion model is as follows: ； Where k represents permeability, h represents thickness, 1, 2, and 3 represent fractured, porous, and pore-type reservoirs, respectively, and H represents the effective thickness after equivalent conversion. The equivalent converted reserve abundance of the gas reservoir is determined based on the effective thickness of the fractured-vuggy reservoir body; the formula for calculating the equivalent converted reserve abundance is as follows: ； in, h1 represents the effective reservoir thickness of fractured-vuggy reservoirs; h2 represents the effective reservoir thickness of porous reservoirs; h3 represents the effective reservoir thickness of permeable reservoirs. The porosity of fractured-vuggy reservoirs; The porosity of a porous reservoir; The porosity of porous reservoirs; The gas saturation of the fractured-vuggy reservoir; The gas saturation of porous reservoirs; The gas saturation of porous reservoirs; Based on the abundance of different types of reservoirs and permeable bodies in the gas reservoir area, the functional equations relating reservoir thickness, interconnected body area, and interconnected body reserves are determined; the functional equations are as follows: ； Where H is the total reservoir thickness (m) of both fractured and porous reservoirs; and S is the area of ​​the connected body (km²). 2 E represents the storage capacity of the connected component, 10 8 m 3 ; By substituting the pre-defined discrete data from the analytical model and / or mechanistic model into the functional equation, discrete benefit evaluation data can be obtained. For discrete benefit assessment data, a benefit assessment model is constructed by fitting curves. The benefit assessment model based on the analytical model and the benefit assessment model based on the mechanism model are integrated to obtain a comprehensive benefit assessment model for gas reservoir areas.

2. The method according to claim 1, characterized in that, The preset discrete data includes: the interconnected reserves of the reservoir, the ratio of reservoir thickness between fractured and porous reservoirs, the total reservoir thickness between fractured and porous reservoirs, the ratio of single-well control radius of fractured and porous reservoirs, and the initial production of the gas well.

3. The method according to claim 1, characterized in that, The method for determining the area of ​​the connected volume includes: Determine the boundary value of the reservoir fracture development density of the connected body based on dynamic and static data from seismic interpretation data and / or well logging data; The area of ​​the connected body is determined based on the boundary value of the fracture development density of the reservoir.

4. A method for selecting development zones for gas wells, characterized in that, include: The benefit assessment model is constructed based on the method of constructing the gas reservoir benefit assessment model according to any one of claims 1 to 3, and a preset single-well cumulative production threshold is used to select the scope of the benefit development zone for the gas well development.

5. An apparatus for constructing a gas reservoir benefit assessment model, used to execute the method for constructing a gas reservoir benefit assessment model as described in any one of claims 1 to 3, characterized in that, include: The determination module is used to construct the functional equations between reservoir thickness, interconnected area and interconnected reserves in a gas reservoir area based on the abundance of different types of reservoirs and permeable bodies in the gas reservoir area. The construction module inputs preset discrete data from the analytical model and / or mechanistic model into the functional equation to construct a benefit evaluation model.

6. The apparatus according to claim 5, further comprising: Fusion module; The fusion module is used to fuse the benefit assessment model obtained based on the analytical model and the benefit assessment model obtained based on the mechanism model to obtain a comprehensive benefit assessment model for the gas reservoir area.

7. A gas well development area selection device, characterized in that, include: The apparatus for constructing and selecting the gas reservoir benefit assessment model as described in claim 5 or 6; The selection module is used to select the scope of the benefit development zone for the gas well development based on the benefit assessment model constructed by the gas reservoir benefit assessment model construction device and the preset single-well cumulative production threshold.

8. A computer-readable storage medium having a computer program stored thereon, characterized in that, When executed by the processor, the program implements the method for constructing the gas reservoir benefit assessment model as described in any one of claims 1 to 3, or the method for selecting gas well development areas as described in claim 4.

9. A computer device, comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, characterized in that, When the processor executes the program, it implements the method for constructing the gas reservoir area benefit assessment model as described in any one of claims 1 to 3, or the method for selecting gas well development areas as described in claim 4.

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