Method and device for evaluating development potential of karst reservoir and oil extraction method

Abstract

The embodiment of the invention provides a method and device for evaluating the development potential of a karst oil reservoir and an oil extraction method. The method comprises the steps that the oil and gas filling capacity and karst formation causes of fractures in a target oil extraction area are obtained; according to the karst formation cause, the fractured and inter-fracture karst reservoir scale in the target oil production area is determined; determining the oil and gas enrichment degree according to the oil and gas filling capacity and the karst reservoir scale; and performing development sweet spot prediction and well location prediction on the target oil production area according to the oil and gas enrichment rule. According to the method, the development potential in the oil reservoir is efficiently evaluated.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of oil reservoir development and geology, in particular to a method and device for evaluating the development potential of karst oil reservoirs and an oil production method. BACKGROUND

[0002] Fault-controlled karst oil reservoirs are an important type of carbonate fracture-cave reservoirs. Evaluating the development potential of fault-controlled karst oil reservoirs is a key step in oilfield development. However, the existing technology mainly refers to the cause of description and spatial structure characterization for fault-controlled karst. This method determines the development process of the reservoir body of faulted karst from fractures to cavities by discussing the formation mechanism and evolution characteristics of faulted karst reservoirs. This method cannot accurately evaluate the development potential of the internal reservoir. SUMMARY

[0003] The purpose of the embodiments of the present application is to provide a method and device for evaluating the development potential of karst oil reservoirs and an oil production method, which realizes efficient evaluation of the development potential of the internal reservoir.

[0004] In order to achieve the above-mentioned purpose, the embodiments of the present application provide a method for evaluating the development potential of karst oil reservoirs, which comprises:

[0005] Obtaining the oil and gas charging capacity of the fractures in the target oil production area and the karst genesis;

[0006] Determining the karst reservoir scale of the fractures and inter-faults in the target oil production area according to the karst genesis;

[0007] Determining the oil and gas enrichment degree according to the oil and gas charging capacity and the karst reservoir scale;

[0008] According to the oil and gas enrichment rule, the development sweet spot prediction and well location prediction of the target oil production area are carried out.

[0009] Optionally, the oil and gas charging capacity of the fractures in the target oil production area comprises:

[0010] According to the fracture parameters of the target oil production area, the oil and gas charging capacity between fractures of different levels and the oil and gas charging capacity inside the same fracture are obtained;

[0011] The fracture parameters include the fracture activity period, the fracture downward breaking layer and the fracture scale.

[0012] Optionally, the oil and gas charging capacity between fractures of different levels and the oil and gas charging capacity inside the same fracture comprises:

[0013] According to the fracture source and the late activity intensity, the oil and gas charging capacity between fractures of different levels is determined, and the oil and gas charging capacity between fractures of different levels is positively related to the fracture source and the activity intensity.

[0014] determine the oil and gas charging capacity in the same fracture according to the fracture vertical structure difference and the gypsum rock thickness difference, wherein the fracture vertical structure difference and the gypsum rock thickness difference are positively correlated with the oil and gas charging capacity in the same fracture;

[0015] The fracture vertical structure difference is the proportion of vertical through type structure and side joint type structure.

[0016] Optionally, the karst reservoir scale of the fracture and the inter-fracture in the target oil production area is determined according to the karst genesis, and the karst genesis includes:

[0017] The karst genesis includes: surface water infiltration and corrosion along the fracture and surface water corrosion along the inter-fracture fracture network.

[0018] The karst reservoir along the fracture is distributed along the fracture.

[0019] The karst reservoir along the inter-fracture fracture network is relatively developed, and the development direction of the reservoir is consistent with the direction of the surface water.

[0020] Optionally, the oil and gas enrichment degree is determined according to the oil and gas charging capacity and the karst reservoir scale, and the oil and gas charging capacity and the karst reservoir scale are positively correlated with the oil and gas enrichment degree.

[0021] The oil and gas charging capacity and the karst reservoir scale are positively correlated with the oil and gas enrichment degree.

[0022] Optionally, the development sweet spot prediction and the well site prediction of the target oil production area are performed according to the oil and gas enrichment rule, and the oil and gas enrichment rule includes:

[0023] The oil reserves and connectivity of the target oil production area are determined according to the oil and gas enrichment rule.

[0024] The development of the well area reservoir and the oil and gas enrichment are determined according to the oil and gas enrichment rule, and the oil reserves of the target oil production area are obtained by reservoir recalculation according to the development of the well area reservoir and the oil and gas enrichment.

[0025] The development sweet spot prediction and the well site prediction of the target oil production area are performed according to the oil and gas enrichment rule.

[0026] In another aspect, the present application also provides a device for evaluating the development potential of karst oil reservoirs, and the device comprises:

[0027] An acquisition module is configured to acquire the oil and gas charging capacity and the karst genesis of the fracture in the target oil production area.

[0028] A first processing module is configured to determine the karst reservoir scale of the fracture and the inter-fracture in the target oil production area according to the karst genesis.

[0029] a second processing module configured to determine the oil and gas enrichment degree according to the oil and gas charging capacity and the karst reservoir scale;

[0030] a third processing module configured to predict the development sweet spot and the well location of the target oil production area according to the oil and gas enrichment rule.

[0031] Optionally, the oil and gas charging capacity of the fracture in the target oil production area is obtained by:

[0032] The oil and gas charging capacity between different levels of fractures and the oil and gas charging capacity inside the same fracture are obtained according to the fracture parameters of the target oil production area.

[0033] The fracture parameters include the fracture activity period, the fracture downward penetrating layer and the fracture scale.

[0034] Optionally, the oil and gas charging capacity between different levels of fractures and the oil and gas charging capacity inside the same fracture are obtained by:

[0035] The oil and gas charging capacity between different levels of fractures is determined according to the fracture source and the late activity intensity, and the oil and gas charging capacity between different levels of fractures is positively correlated with the fracture source and the activity intensity.

[0036] The oil and gas charging capacity inside the same fracture is determined according to the fracture vertical structure difference and the gypsodolomite thickness difference, and the fracture vertical structure difference and the gypsodolomite thickness difference are positively correlated with the oil and gas charging capacity inside the same fracture.

[0037] The fracture vertical structure difference is the proportion of vertical through type structure and side joint type structure.

[0038] Optionally, the karst reservoir scale of the fracture and the inter-fracture in the target oil production area is determined according to the karst genesis, and the karst genesis includes:

[0039] The karst genesis includes: surface water infiltration and corrosion along the fracture and surface water corrosion along the inter-fracture fracture network.

[0040] The karst reservoir along the fracture is distributed along the fracture.

[0041] The karst reservoir developed along the inter-fracture fracture network is relatively developed, and the development direction of the reservoir is consistent with the direction of the surface water.

[0042] Optionally, the development sweet spot and the well location of the target oil production area are predicted according to the oil and gas enrichment rule, and the oil and gas enrichment rule includes:

[0043] The oil and gas enrichment rule is used to determine the oil reserves and connectivity of the target oil production area.

[0044] According to the oil and gas enrichment rule, the reservoir development and oil and gas enrichment of the well area are determined, and the crude oil reserves of the target oil production area are obtained by reserve recalculation according to the reservoir development and oil and gas enrichment of the well area.

[0045] According to the crude oil reserves and connectivity, the development sweet spot prediction and well site prediction of the target oil production area are carried out.

[0046] In another aspect, the present application also provides a method for oil production, which carries out oil production on the target oil production area according to the development sweet spot prediction and well site prediction obtained by the method for evaluating the development potential of karst oil reservoirs.

[0047] The method for evaluating the development potential of karst oil reservoirs comprises: obtaining the oil and gas charging capacity of fractures and karst genesis in a target oil production area; determining the karst reservoir scale of fractures and inter-fracture in the target oil production area according to the karst genesis; determining the oil and gas enrichment degree according to the oil and gas charging capacity and the karst reservoir scale; and carrying out development sweet spot prediction and well site prediction on the target oil production area according to the oil and gas enrichment rule. The method describes the karst genesis and reservoir spatial distribution characteristics based on seismic attributes, combines the oil and gas charging capacity of fractures, evaluates the oil and gas enrichment rule by combining dynamic and static, obtains high-yield enrichment characteristics, realizes efficient prediction of development sweet spot, guides the evaluation of oilfield development potential and well site deployment, effectively avoids deployment risks, and improves the development effect of oilfields.

[0048] Other features and advantages of the embodiments of the present application will be described in detail in the following specific embodiments. BRIEF DESCRIPTION OF DRAWINGS

[0049] The accompanying drawings are included to provide a further understanding of the embodiments of the present application, and constitute a part of the specification, and are used together with the following specific embodiments to explain the embodiments of the present application, but do not constitute a limitation on the embodiments of the present application. In the drawings:

[0050] Figure 1 is a flowchart of a method for evaluating the development potential of karst oil reservoirs;

[0051] Figure 2 is a TPT area coherent slice and fracture grading plan view of the present application;

[0052] Figure 3 is a fracture vertical structure profile of the present application;

[0053] Figure 4 is a paleostructure and paleo-drainage plan distribution map of the present application;

[0054] Figures 5a-5b is an oil and gas high-yield enrichment mode map of the present application;

[0055] Figure 6A three-dimensional sculpture graph of the seam hole body for the present application;

[0056] Figure 7 A dessert prediction and well site construction plan for the present application is developed;

[0057] Figure 8 A TP 6 well area reserve distribution graph for the present application. DETAILED DESCRIPTION

[0058] The specific embodiments of the embodiments of the present application are described in detail below with reference to the accompanying drawings. It should be understood that the specific embodiments 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.

[0059] Embodiment one

[0060] Figure 1 A flowchart of a method for evaluating the development potential of a karst oil reservoir is shown in FIG. 1, and the method for evaluating the development potential of a karst oil reservoir includes the following steps. Figure 1

[0061] According to a specific embodiment, the fractures in the target oil production area are evaluated according to the fracture principle, and the fractures in the target area are divided into three levels: first-order fractures, second-order fractures and third-order fractures. The first-order fractures are large in size and break through T90 downward; the second-order fractures are large in size and break through T81 downward; and the third-order fractures are weakly active or inactive in the late period, and are north-west secondary fractures or north-east Ordovician internal fractures.

[0062] The karst causes include: surface water infiltration and dissolution along the fractures and surface water dissolution along the inter-fault fracture network. Specifically, the karst formed by the infiltration and dissolution of surface water along the fractures is a reservoir body distributed along the fractures; and the karst formed by the dissolution of surface water along the inter-fault fracture network is a dissolution along the unconformity surface (fracture network) due to the comprehensive action of surface water, and finally forms an inter-fault fracture-vug body.

[0063] According to a specific embodiment, the oil and gas charging capacity of the fractures in the target oil production area is obtained by classifying the fractures according to the fracture parameters of the target oil production area, and obtaining the oil and gas charging capacity between different levels of fractures and the oil and gas charging capacity inside the same fracture; the fracture parameters include: fracture activity period, fracture downward breaking layer and fracture size.

[0064] ​The method of obtaining the hydrocarbon injection capacity between different levels of fractures and the hydrocarbon injection capacity within the same fracture includes: determining the hydrocarbon injection capacity between different levels of fractures based on fracture source characteristics and late-stage activity intensity, wherein the hydrocarbon injection capacity between different levels of fractures is positively correlated with fracture source characteristics and activity intensity; determining the hydrocarbon injection capacity within the same fracture based on differences in fracture vertical structure and gypsum thickness, wherein both differences in fracture vertical structure and gypsum thickness are positively correlated with the hydrocarbon injection capacity within the same fracture; the differences in fracture vertical structure are the proportion of vertically connected structures and laterally connected structures.

[0065] Specifically, the main criteria for evaluating the charging capacity of fault reservoirs of different orders are the fault's source connectivity and the intensity of late-stage activity. The fault's source connectivity determines whether hydrocarbons are charged, while late-stage activity determines the intensity of charging. If the activity period does not match the reservoir formation period, the charging capacity is weak. If the fault lacks a source connectivity, it indicates that hydrocarbons are not directly charged and lateral adjustments are needed. Therefore, differences in the vertical structure of faults affect the hydrocarbon charging capacity within first-order faults, while differences in gypsum rock thickness affect the hydrocarbon charging capacity within second-order faults.

[0066] Step S102 is to determine the scale of karst reservoirs in the target oil production area based on the karst genesis.

[0067] According to a specific implementation method, determining the scale of karst reservoirs in the target oil production area based on the karst genesis includes: the karst genesis includes: surface water infiltration and dissolution along faults and surface water dissolution along fault fracture networks; the karst reservoirs dissolved by surface water infiltration and dissolution along faults are distributed along the faults; the karst reservoirs dissolved by surface water along fault fracture networks are relatively well-developed, and the development direction of the reservoirs is consistent with the direction of surface water.

[0068] Step S103 involves determining the degree of oil and gas enrichment based on the oil and gas injection capacity and the size of the karst reservoir. Specifically, determining the degree of oil and gas enrichment based on the oil and gas injection capacity and the size of the karst reservoir includes: both the oil and gas injection capacity and the size of the karst reservoir are positively correlated with the degree of oil and gas enrichment. The stronger the oil and gas injection capacity, and / or the larger the size of the karst reservoir, the better the degree of oil and gas enrichment.

[0069] According to a specific implementation method, combined with the differential enrichment patterns of oil and gas revealed by actual drilling, there are four main ways to enrich high-yield oil and gas, including: enrichment in the dominant segment of the primary source-source fault; enrichment in the dominant segment of the secondary source-source fault; enrichment in the favorable oil and gas adjustment location of the tertiary fault; and enrichment in the favorable oil and gas adjustment location of the fault-intercalated karst fracture cave.

[0070] Step S104 involves predicting the sweet spot and well location of the target oil production area based on the oil and gas enrichment patterns.

[0071] According to a specific embodiment, the development sweet spot prediction and well site prediction of the target oil production area according to the oil and gas enrichment rule comprises: determining the crude oil reserves and connectivity of the target oil production area according to the oil and gas enrichment rule; determining the development of the well area reservoir body and the oil and gas enrichment according to the oil and gas enrichment rule, and recalculating the reserves according to the development of the well area reservoir body and the oil and gas enrichment to obtain the crude oil reserves of the target oil production area; and predicting the development sweet spot and well site of the target oil production area according to the crude oil reserves and connectivity. The connectivity is the degree of interwell connectivity determined according to water injection, gas injection, production characteristics and the like.

[0072] Specifically, as shown in Figure 6 The calculation of the crude oil reserves needs to be based on attribute optimization, well-seismic calibration, and comprehensively consider the development of the well area reservoir body and the understanding of oil and gas enrichment, and the reserves are recalculated according to the results of the fine carving of the well area.

[0073] According to a specific embodiment, the development sweet spot prediction and well site prediction of the target oil production area are performed according to the primary fracture, the secondary fracture, the tertiary fracture and the inter-fault fracture-cave body. The primary fracture has high oil and gas enrichment degree and high control degree, and the remaining oil is divided according to the primary fracture. The secondary fracture has source connectivity, and the advantage of the injection path and the un-well-controlled fracture-cave body are searched. The tertiary fracture has weak or no source connectivity, and the structural relationship between the fracture-cave body and the transport fracture is focused on to improve the control. The favorable oil and gas adjustment sweet spot is searched for the inter-fault fracture-cave body, and the un-produced reservoir body in the high-yield and high-concentration area is considered to improve the well pattern.

[0074] The method of the present application is based on the description of karst causes and reservoir spatial distribution characteristics by seismic attributes, combined with the oil and gas injection capacity of the fracture, the oil and gas enrichment rule is evaluated dynamically and statically to obtain the high-yield and high-concentration characteristics, and the development sweet spot is efficiently predicted to guide the oilfield development potential evaluation and well site deployment, effectively avoiding the deployment risk and improving the oilfield development effect.

[0075] Example two

[0076] Taking a certain area of Tahe Oilfield as an example, the development potential evaluation comprises the following four steps: fracture classification evaluation, karst spatial feature description, high-yield and high-concentration enrichment rule research, and development potential evaluation and sweet spot prediction.

[0077] Specifically, the fracture classification evaluation comprises: dividing the fractures in the TPT area into three orders (as shown in Figure 2 The primary fracture: Caledonian period, Hercynian period, Indosinian, Yanshanian period continuous activity, the fracture downwardly breaks through T90, large scale; the secondary fracture: Caledonian period, Hercynian period activity, the fracture downwardly breaks through T81, larger scale; the tertiary fracture: Caledonian period, the late period is not active or weakly active, the north-west secondary fracture or the north-east Ordovician internal fracture.

[0078] Among them, the first-order fracture has strong filling capacity, the second-order fracture has medium filling capacity, and the third-order fracture has weak filling capacity (as shown in Table 1), which needs to be adjusted horizontally. The vertical structural difference of the fracture affects the internal oil and gas filling capacity of the first-order fracture (as shown in a and b in Figure 3 The thickness difference of the gypsodolomite affects the internal oil and gas filling capacity of the second-order fracture (as shown in c and d in Figure 3 ).

[0079] Table 1:

[0080]

[0081] The karst of the TPT area is affected by two periods of karst of the middle stage of the Caledonian, and the surface water runoff of the middle stage of the Caledonian is relatively developed, the water power is strong, and it belongs to the main karst period (as shown in Figure 4 ). The karst reservoir of the first-order fracture is distributed along the fracture, and the segmentation is obvious; the karst reservoir of the second-order fracture and the third-order fracture is relatively poor, and the inter-fault karst reservoir is relatively developed. The development direction of the reservoir is consistent with the direction of the surface water.

[0082] Combined with the actual drilling well, the oil and gas difference enrichment law is revealed, and there are mainly four ways of high-yield oil and gas enrichment (as shown in Figures 5a-5b ). The first-order through-source fracture advantage section, the second-order through-source fracture advantage section, the third-order fracture oil and gas favorable oil and gas adjustment position, and the inter-fault karst fracture-cave body favorable oil and gas adjustment position.

[0083] According to the oil and gas enrichment law, the crude oil reserves and connectivity of the target oil production area are determined; according to the oil and gas enrichment law, the reservoir development and oil and gas enrichment of the well area are determined, and the crude oil reserves of the target oil production area are obtained by reservoir re-computation according to the reservoir development and oil and gas enrichment of the well area. According to the crude oil reserves and connectivity, the development sweet spot prediction and well site prediction of the target oil production area are carried out. The connectivity is to judge the inter-well connectivity according to water injection, gas injection, production characteristic response, etc. (as shown in Table 2).

[0084] Table 2:

[0085]

[0086] Among them, the calculation of the crude oil reserves needs to be based on the attribute optimization and well-seismic calibration, comprehensively consider the reservoir development and oil and gas enrichment of the well area, and carry out the reservoir re-computation according to the results of the well area fine carving (as shown in Figure 8 ).

[0087] Finally, the development sweet spot prediction and well site suggestion are obtained (as shown in Figure 7The target oil production area is divided into the TP6 well area, a fault interval oil and gas enrichment area, and an unproduced reservoir with high yield and enrichment, and the favorable target positions (W1, W2, and W3) are recommended, and the well pattern is improved, which is beneficial to improve the oil and gas recovery rate of the whole area.

[0088] Embodiment three

[0089] In another aspect, the present application also provides a device for evaluating the development potential of a karst oil reservoir, comprising: an acquisition module for acquiring the oil and gas charging capacity and karst genesis of the fractures in the target oil production area; a first processing module for determining the karst reservoir scale of the fractures and the inter-faults in the target oil production area according to the karst genesis; a second processing module for determining the oil and gas enrichment degree according to the oil and gas charging capacity and the karst reservoir scale; and a third processing module for predicting the development sweet spot and well location of the target oil production area according to the oil and gas enrichment rule.

[0090] Specifically, the oil and gas charging capacity of the fractures in the target oil production area is obtained, including: grading according to the fracture parameters of the target oil production area to obtain the oil and gas charging capacity between different levels of fractures and the oil and gas charging capacity inside the same fracture; the fracture parameters include: fracture activity period, fracture downward penetrating layer, and fracture scale. The oil and gas charging capacity between different levels of fractures and the oil and gas charging capacity inside the same fracture are obtained, including: determining the oil and gas charging capacity between different levels of fractures according to the fracture source and the late activity intensity, and the oil and gas charging capacity between different levels of fractures is positively correlated with the fracture source and the activity intensity; determining the oil and gas charging capacity inside the same fracture according to the fracture vertical structure difference and the gypsodolomite thickness difference, and the fracture vertical structure difference and the gypsodolomite thickness difference are positively correlated with the oil and gas charging capacity inside the same fracture; the fracture vertical structure difference is the proportion of vertical through type structure and side joint type structure.

[0091] The karst reservoir scale of the fractures and the inter-faults in the target oil production area is determined according to the karst genesis, including: the karst genesis includes: surface water infiltration and dissolution along the fractures and surface water dissolution along the inter-fault fracture network; the karst reservoir along the fractures is distributed along the fractures; the karst reservoir along the inter-fault fracture network is relatively developed, and the development direction of the reservoir is consistent with the direction of the surface water. The development sweet spot and well location of the target oil production area are predicted according to the oil and gas enrichment rule, including: determining the crude oil reserves and connectivity of the target oil production area according to the oil and gas enrichment rule; determining the reservoir development and oil and gas enrichment of the well area according to the oil and gas enrichment rule, and recalculating the crude oil reserves of the target oil production area according to the reservoir development and oil and gas enrichment of the well area; and predicting the development sweet spot and well location of the target oil production area according to the crude oil reserves and connectivity.

[0092] The device is based on the seismic attribute to describe the karst genesis and reservoir space distribution characteristics, combines the oil and gas charging capacity of the fracture, dynamically and statically evaluates the oil and gas enrichment rule to obtain the high-yield enrichment characteristics, realizes the efficient prediction of the development sweet spot, guides the oilfield development potential evaluation and well site deployment, effectively avoids the deployment risk, and improves the oilfield development effect.

[0093] Embodiment four

[0094] In another aspect, the application further provides a method for oil production, which is based on the development sweet spot prediction result and the well site prediction result obtained by the method for evaluating the development potential of the karst oil reservoir to carry out oil production in a target oil production area. The method can realize efficient oil production.

[0095] The method for evaluating the development potential of the karst oil reservoir comprises the following steps: obtaining the oil and gas charging capacity of the fracture and the karst genesis in a target oil production area; determining the karst reservoir scale of the fracture and the inter-fracture in the target oil production area according to the karst genesis; determining the oil and gas enrichment degree according to the oil and gas charging capacity and the karst reservoir scale; and carrying out the development sweet spot prediction and the well site prediction in the target oil production area according to the oil and gas enrichment rule. The method is based on the seismic attribute to describe the karst genesis and reservoir space distribution characteristics, combines the oil and gas charging capacity of the fracture, dynamically and statically evaluates the oil and gas enrichment rule to obtain the high-yield enrichment characteristics, realizes the efficient prediction of the development sweet spot, guides the oilfield development potential evaluation and well site deployment, effectively avoids the deployment risk, and improves the oilfield development effect.

[0096] Those skilled in the art will understand that the embodiments of the present application can be provided as methods, systems, or computer program products. 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 the form of a computer program product implemented on one or more computer usable storage media containing computer usable program code (including but not limited to disk storage, CD-ROM, optical storage, etc.).

[0097] The present application is described with reference to 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 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 the processor of a general-purpose computer, a special-purpose computer, an embedded processor, or other programmable data processing devices to produce a machine, so that the instructions executed by the processor of the computer or other programmable data processing devices produce a device that implements the functions specified in the flowcharts and / or block diagrams. Figure 1 The device that implements the functions specified in one flow or multiple flows and / or blocks. Figure 1 The device that implements the functions specified in one flow or multiple flows and / or blocks.

[0098] These computer program instructions can also be stored in a computer- readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instructions which implement the Figure 1 function specified in the flow or flows and / or blocks Figure 1 of the block or blocks.

[0099] These computer program instructions can also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the Figure 1 function specified in the flow or flows and / or blocks Figure 1 of the block or blocks.

[0100] In a typical configuration, a computing device includes one or more processors (CPUs), input / output interfaces, network interfaces, and memory.

[0101] The memory can include non-persistent memory and / or volatile memory, such as a random access memory (RAM) including a cache area for the temporary storage of data. The memory can also include non-volatile memory, such as read only memory (ROM), electrically programmable read only memory (EPROM), electrically erasable programmable read only memory (EEPROM), flash memory, or non-volatile random access memory (NVRAM), for the storage of information, such as data files or program

[0102] Computer readable media includes permanent and non-permanent, removable and non-removable media implemented in any method or technology for the storage of information. The 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 disc read only memory (CD-ROM), digital versatile discs (DVDs) or other optical storage, magnetic cassettes, magnetic tapes, magnetic disk storage or other magnetic storage devices, or any other non-transmission medium that can be used to store information accessible to a computing device. According to the definition herein, computer readable media does not include transitory media, such as modulated data signals and carrier waves.

[0103] ​It should also be noted that the terms "comprising", "comprises" or other variations thereof are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but can also include other elements not expressly listed or inherent to such process, method, article, or apparatus.

[0104] The above embodiments are only used to illustrate the present application, but not to limit it. Instead of the above, various modifications and changes can be made to the application by those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the application shall fall into the scope of the claims of the application.

Claims

1. A method for evaluating the development potential of a karst oil reservoir, characterized in that, The method comprises: obtaining the oil and gas charging capacity and karst genesis of the fractures in the target oil production area; determining the karst reservoir scale of the fractures and inter-faults in the target oil production area according to the karst genesis; determining the oil and gas enrichment degree according to the oil and gas charging capacity and the karst reservoir scale; predicting the development sweet spot and well location of the target oil production area according to the oil and gas enrichment rule.

2. The method of claim 1, wherein, The method comprises: grading the fractures in the target oil production area according to the fracture parameters to obtain the oil and gas charging capacity between fractures of different levels and the oil and gas charging capacity inside the same fracture; the fracture parameters include the fracture activity period, the fracture downward penetrating layer and the fracture scale.

3. The method of claim 2, wherein, The method comprises: determining the oil and gas charging capacity between fractures of different levels according to the fracture source and the late activity intensity, wherein the oil and gas charging capacity between fractures of different levels is positively correlated with the fracture source and the activity intensity; determining the oil and gas charging capacity inside the same fracture according to the fracture vertical structure difference and the gypsodolomite thickness difference, wherein the oil and gas charging capacity inside the same fracture is positively correlated with the fracture vertical structure difference and the gypsodolomite thickness difference; the fracture vertical structure difference is the proportion of vertical through type structure and side joint type structure.

4. The method of claim 1, wherein, The method comprises: the karst genesis includes the downward infiltration and dissolution of surface water along the fractures and the dissolution of surface water along the inter-fault fracture network; the karst reservoir along the fractures is distributed along the fractures; the karst reservoir along the inter-fault fracture network is relatively developed, and the development direction of the reservoir is consistent with the direction of surface water.

5. The method of claim 1, wherein, The method comprises: the oil and gas charging capacity and the karst reservoir scale are positively correlated with the oil and gas enrichment degree.

6. The method of claim 1, wherein, The method comprises: determining the crude oil reserves and connectivity of the target oil production area according to the oil and gas enrichment rule; determining the development of reservoirs in well areas and the oil and gas enrichment according to the oil and gas enrichment rule, and recalculating the crude oil reserves of the target oil production area according to the development of reservoirs in well areas and the oil and gas enrichment; predicting the development sweet spot and well location of the target oil production area according to the crude oil reserves and connectivity.

7. A device for evaluating the development potential of a karst oil reservoir, characterized in that it comprises: The device comprises: an acquisition module configured to obtain the oil and gas charging capacity and karst genesis of the fractures in the target oil production area; a first processing module configured to determine the karst reservoir scale of the fractures and inter-faults in the target oil production area according to the karst genesis; a second processing module configured to determine the oil and gas enrichment degree according to the oil and gas charging capacity and the karst reservoir scale; a third processing module configured to predict the development sweet spot and well location of the target oil production area according to the oil and gas enrichment rule.

8. The apparatus of claim 7, wherein, The method comprises: According to the fracture parameters of the target oil production area, the oil and gas filling capacity between different levels of fractures and the oil and gas filling capacity inside the same fracture are obtained. The fracture parameters include fracture activity period, fracture downward breaking layer and fracture scale.

9. The apparatus of claim 8, wherein, The oil and gas filling capacity between different levels of fractures and the oil and gas filling capacity inside the same fracture are obtained by: According to the fracture source and the intensity of late activity, the oil and gas filling capacity between different levels of fractures is determined, and the oil and gas filling capacity between different levels of fractures is positively related to the fracture source and the intensity of activity. According to the vertical structure difference of the fracture and the thickness difference of the gypsum rock, the oil and gas filling capacity inside the same fracture is determined, and the vertical structure difference of the fracture and the thickness difference of the gypsum rock are positively related to the oil and gas filling capacity inside the same fracture. The vertical structure difference of the fracture is the proportion of vertical through type structure and side joint type structure.

10. The apparatus of claim 7, wherein, According to the karst causes, the karst reservoir scale of the fractures and inter-fracture in the target oil production area is determined, including: The karst causes include surface water infiltration and corrosion along the fracture and surface water corrosion along the inter-fracture fracture network. The karst reservoir along the fracture is distributed along the fracture. The karst reservoir along the inter-fracture fracture network is relatively developed, and the development direction of the reservoir is consistent with the direction of the surface water.

11. The apparatus of claim 7, wherein, According to the oil and gas enrichment rule, the development sweet spot prediction and well location prediction of the target oil production area are carried out, including: According to the oil and gas enrichment rule, the oil reserves and connectivity of the target oil production area are determined. According to the oil and gas enrichment rule, the development of the well area reservoir and the oil and gas enrichment are determined, and the oil reserves of the target oil production area are obtained by reservoir recalculation according to the development of the well area reservoir and the oil and gas enrichment. According to the oil reserves and connectivity, the development sweet spot prediction and well location prediction of the target oil production area are carried out.

12. A method of oil recovery, characterized by, According to the development sweet spot prediction results and well location prediction results obtained by the method for evaluating the development potential of karst oil reservoirs according to any one of claims 1-6, the oil production of the target oil production area is carried out.

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