Limestone geothermal reservoir grade parameterization evaluation method, device, equipment and medium

Abstract

The invention discloses a limestone geothermal reservoir grade parameterization evaluation method, device and equipment and a medium. The method can comprise the steps that reservoir contrastive analysis is conducted on a target well, and the residual thickness of each limestone geothermal reservoir after weathering denudation is determined; combining the distribution condition of the geothermal reservoir in the region, comprehensively researching and recovering the ancient landform, and determining the original thickness of each set of limestone geothermal reservoir drilled by the target well before weathering denudation; calculating an average diagenesis duration parameter of all drilling reservoirs of the target well; calculating grade evaluation parameters of the geothermal reservoir encountering drilling of the target well; and according to the grade evaluation parameters, evaluating the grade of the drilling geothermal reservoir. By calculating the grade evaluation parameters of the drilling geothermal reservoir, the grade of the drilling geothermal reservoir of each well is evaluated, the method is simple, convenient and rapid, and the method can help to guide and optimize a favorable geothermal development target area at the initial stage of feasibility research of regional geothermal development.

Description

Technical Field

[0001] The present invention relates to the field of geothermal reservoir evaluation, and more specifically, to a method, device, equipment and medium for parametric evaluation of the grade of limestone geothermal reservoir. Background Art

[0002] Geothermal energy is a pollution-free and renewable clean energy. In the context of the increasing environmental awareness and the growing shortage of energy today, the rational development and utilization of geothermal resources have received more and more attention, and geothermal heating has become a new energy development and utilization method vigorously promoted in China.

[0003] In order to carry out the development of geothermal resources well, it is necessary to conduct resource evaluation on underground geothermal reservoirs and select favorable areas for underground geothermal resources for geothermal development and utilization. Limestone geothermal reservoir is a common geothermal reservoir. At present, to determine the development potential of a limestone geothermal reservoir in a region, it is usually to carry out geothermal reservoir evaluation research on this region. By studying various factors such as the structure, reservoir, fractures, lithology, physical properties, and fluid properties of the regional geothermal reservoir and their spatial distribution laws, an estimate is made of the quantity and quality of geothermal energy and geothermal fluid in the geothermal reservoir, and an assessment is made of the reserves that can be developed and utilized under certain technical and economic conditions and the possible impacts caused by the development.

[0004] At present, the method of determining favorable target areas for geothermal development by conventional geothermal reservoir resource evaluation research is selected artificially based on empirical understanding after a large amount of basic research work is completed, which has problems such as large research workload, long time consumption, and fuzzy criteria for determining favorable areas.

[0005] There is a need to develop a method, device, equipment and medium for parametric evaluation of the grade of limestone geothermal reservoir.

[0006] The information disclosed in the background art section of the present invention is only intended to deepen the understanding of the general background art of the present invention, and should not be regarded as an admission or any form of implication that this information constitutes the prior art known to those skilled in the art. Summary of the Invention

[0007] The present invention provides a method, device, equipment and medium for parametric evaluation of the grade of limestone geothermal reservoir, which can evaluate the grade of the geothermal reservoir drilled by each well by calculating the evaluation parameters of the grade of the geothermal reservoir drilled, which is simple and fast, and can help guide the selection of favorable target areas for geothermal development at the initial stage of the feasibility study of regional geothermal development.

[0008] In a first aspect, an embodiment of the present disclosure provides a method for parametric evaluation of the grade of limestone geothermal reservoir, including:

[0009] Performing reservoir comparison and analysis on a target well to determine the residual thickness of each set of limestone geothermal reservoir after weathering and erosion;

[0010] Combined with the distribution of regional geothermal reservoirs, comprehensively study and restore the paleogeomorphology to determine the original thickness of each set of limestone geothermal reservoirs encountered by the target well before weathering and erosion.

[0011] Calculate the average diagenetic duration parameter of all reservoirs encountered by the target well.

[0012] Calculate the grade evaluation parameter of the geothermal reservoir encountered by the target well.

[0013] Evaluate the grade of the geothermal reservoir encountered according to the grade evaluation parameter.

[0014] Preferably, the average diagenetic duration parameter of all reservoirs encountered by the target well is calculated by formula (1):

[0015]

[0016] Wherein, is the average diagenetic duration parameter, h n is the residual thickness of the nth layer, β n is the single-layer diagenetic duration parameter β of the nth layer.

[0017] Preferably, the single-layer diagenetic duration parameter β is a parameter reflecting the influence weight of the formation weathering and erosion degree due to the diagenetic time length of the strata in each geological era, and the calculation formula is:

[0018]

[0019] Wherein, t ∈ is the diagenetic time length of the Cambrian, t n is the diagenetic time length of the nth layer of strata.

[0020] Preferably, the grade evaluation parameter of the geothermal reservoir encountered by the target well is calculated by formula (3):

[0021]

[0022] Wherein, α is the grade evaluation parameter of the geothermal reservoir encountered, h n is the residual thickness of the nth layer, H n is the original thickness of the nth layer, is the average diagenetic duration parameter.

[0023] Preferably, the smaller the grade evaluation parameter, the better the grade of the geothermal reservoir.

[0024] Preferably, it further includes:

[0025] Set the first grade evaluation parameter threshold and the second grade evaluation parameter threshold, and then conduct classification evaluation for the reservoir.

[0026] Preferably, if the grade evaluation parameter is less than the first grade evaluation parameter threshold, it is a type I geothermal reservoir with great potential for geothermal development;

[0027] If the grade evaluation parameter is greater than the first grade evaluation parameter threshold and less than the second grade evaluation parameter threshold, it is a type II geothermal reservoir with medium potential for geothermal development;

[0028] If the grade evaluation parameter is greater than the second grade evaluation parameter threshold, it is a type III geothermal reservoir with poor potential for geothermal development.

[0029] In a second aspect, the embodiments of the present disclosure also provide a parametric evaluation device for the grade of a limestone geothermal reservoir, including:

[0030] A comparison module that conducts reservoir comparison and analysis on a target well to determine the remaining thickness of each set of limestone geothermal reservoirs after weathering and erosion;

[0031] A restoration module that comprehensively studies and restores the paleogeomorphology in combination with the distribution of regional geothermal reservoirs to determine the original thickness of each set of limestone geothermal reservoirs drilled by the target well before weathering and erosion;

[0032] An averaging module that calculates the average diagenetic duration parameter of all reservoirs drilled by the target well;

[0033] A calculation module that calculates the grade evaluation parameter of the geothermal reservoir drilled by the target well;

[0034] An evaluation module that evaluates the grade of the geothermal reservoir drilled according to the grade evaluation parameter.

[0035] Preferably, the average diagenetic duration parameter of all reservoirs drilled by the target well is calculated by formula (1):

[0036]

[0037] wherein, is the average diagenetic duration parameter, h n is the remaining thickness of the nth layer, β n is the single-layer diagenetic duration parameter β of the nth layer.

[0038] Preferably, the single-layer diagenetic duration parameter β is a parameter reflecting the influence weight of the formation weathering and erosion degree due to the diagenetic time length of each geological era, and the calculation formula is:

[0039]

[0040] wherein, t ∈ is the diagenetic time length of the Cambrian, t n is the diagenetic time length of the nth layer formation.

[0041] Preferably, the evaluation parameter of the geothermal reservoir encountered by the target well is calculated by formula (3):

[0042]

[0043] where α is the evaluation parameter of the geothermal reservoir encountered, h n is the residual thickness of the nth layer, and H n is the original thickness of the nth layer, and is the average diagenesis duration parameter.

[0044] Preferably, the smaller the evaluation parameter of the grade, the better the grade of the geothermal reservoir.

[0045] Preferably, it further includes:

[0046] Set the first evaluation parameter threshold and the second evaluation parameter threshold of the grade, and then conduct a classification evaluation for the reservoir.

[0047] Preferably, if the evaluation parameter of the grade is less than the first evaluation parameter threshold of the grade, it is a type I geothermal reservoir, and the geothermal development potential of the reservoir is large;

[0048] If the evaluation parameter of the grade is greater than the first evaluation parameter threshold of the grade and less than the second evaluation parameter threshold of the grade, it is a type II geothermal reservoir, and the geothermal development potential of the reservoir is medium;

[0049] If the evaluation parameter of the grade is greater than the second evaluation parameter threshold of the grade, it is a type III geothermal reservoir, and the geothermal development potential of the reservoir is poor.

[0050] Thirdly, an embodiment of the present disclosure further provides an electronic device, which includes:

[0051] a memory storing executable instructions;

[0052] a processor, and the processor runs the executable instructions in the memory to implement the parametric evaluation method for the grade of the limestone geothermal reservoir.

[0053] Fourthly, an embodiment of the present disclosure further provides a computer-readable storage medium, which stores a computer program, and when the computer program is executed by a processor, it implements the parametric evaluation method for the grade of the limestone geothermal reservoir.

[0054] The method and device of the present invention have other characteristics and advantages, which will be obvious from the accompanying drawings incorporated herein and the subsequent specific embodiments, or will be described in detail in the accompanying drawings incorporated herein and the subsequent specific embodiments. These drawings and specific embodiments are jointly used to explain the specific principles of the present invention. Description of the Drawings

[0055] The above and other objects, features, and advantages of the present invention will become more apparent by describing the exemplary embodiments of the present invention in more detail with reference to the accompanying drawings, wherein, in the exemplary embodiments of the present invention, the same reference numerals generally represent the same components.

[0056] Figure 1 A flowchart showing the steps of a method for parametric evaluation of the grade of a limestone geothermal reservoir according to an embodiment of the present invention is shown.

[0057] Figure 2 A block diagram showing a parametric evaluation device for the grade of a limestone geothermal reservoir according to an embodiment of the present invention is shown.

[0058] Description of the reference numerals in the drawings:

[0059] 201, comparison module; 202, restoration module; 203, averaging module; 204, calculation module; 205, evaluation module. Detailed implementation manners

[0060] The preferred embodiments of the present invention will be described in more detail below. Although the preferred embodiments of the present invention are described below, it should be understood that the present invention can be implemented in various forms and should not be limited by the embodiments set forth herein.

[0061] The present invention provides a method for parametric evaluation of the grade of a limestone geothermal reservoir, including:

[0062] Performing reservoir comparison and analysis on the target well to determine the remaining thickness of each set of limestone geothermal reservoirs after weathering and erosion;

[0063] Combining the regional distribution of geothermal reservoirs, comprehensively studying and restoring the paleogeomorphology to determine the original thickness of each set of limestone geothermal reservoirs drilled by the target well before weathering and erosion;

[0064] Calculating the average diagenetic duration parameter of all reservoirs drilled by the target well;

[0065] Calculating the grade evaluation parameter of the geothermal reservoir drilled by the target well;

[0066] Evaluating the grade of the geothermal reservoir drilled according to the grade evaluation parameter.

[0067] In one example, the average diagenetic duration parameter of all reservoirs drilled by the target well is calculated by formula (1):

[0068]

[0069] Wherein, is the average diagenetic duration parameter, h n is the remaining thickness of the nth layer, β nIt is the single-layer diagenetic duration parameter β of the nth layer.

[0070] In one example, the single-layer diagenetic duration parameter β is a parameter reflecting the influence weight of the formation weathering and erosion degree of each geological era's strata due to the length of diagenetic time. The calculation formula is:

[0071]

[0072] Among them, t ∈ is the diagenetic time length of the Cambrian, and t n is the diagenetic time length of the nth layer of strata.

[0073] In one example, the geothermal reservoir grade evaluation parameter of the target well is calculated through formula (3):

[0074]

[0075] Among them, α is the geothermal reservoir grade evaluation parameter, h n is the residual thickness of the nth layer, and H n is the original thickness of the nth layer, is the average diagenetic duration parameter.

[0076] In one example, the smaller the grade evaluation parameter, the better the geothermal reservoir grade.

[0077] In one example, it also includes:

[0078] Set the first grade evaluation parameter threshold and the second grade evaluation parameter threshold, and then conduct a classification evaluation for the reservoir.

[0079] In one example, if the grade evaluation parameter is less than the first grade evaluation parameter threshold, it is a type-I geothermal reservoir, and the geothermal development potential of the reservoir is large;

[0080] If the grade evaluation parameter is greater than the first grade evaluation parameter threshold and less than the second grade evaluation parameter threshold, it is a type-II geothermal reservoir, and the geothermal development potential of the reservoir is medium;

[0081] If the grade evaluation parameter is greater than the second grade evaluation parameter threshold, it is a type-III geothermal reservoir, and the geothermal development potential of the reservoir is poor.

[0082] Specifically, the grade of the limestone geothermal reservoir depends on the development and connectivity of the spaces for storing fluids such as fractures, pores, and karst caves in the geothermal reservoir. The better the development and connectivity of this space, the better the grade of the geothermal reservoir, which is a favorable area for geothermal development; on the contrary, the less developed and the poorer the connectivity of this space, the lower the grade of the geothermal reservoir, which is an unfavorable area for geothermal development. Generally, the storage spaces such as fractures, pores, and karst caves in the limestone geothermal reservoir are mainly concentrated near the weathered crust under the unconformity surface of the reservoir. The higher the degree of weathering and erosion of the reservoir and the longer the time of weathering and erosion, the more developed the storage spaces for fluids such as fractures, pores, and karst caves in the reservoir, and the better the grade of the geothermal reservoir. Thus, the grade of the limestone geothermal reservoir can be simply and quickly determined based on these two influencing factors: the degree of weathering and erosion of the limestone geothermal reservoir and the time of weathering and erosion.

[0083] Using basic data such as drilling, logging, and well logging, conduct reservoir correlation analysis to determine the thickness of each set of limestone geothermal reservoirs drilled by the well, which is the residual thickness h after weathering and erosion of each set of limestone geothermal reservoirs.

[0084] Using paleogeomorphic research methods such as the impression method and the residual thickness method, combined with the distribution of regional geothermal reservoirs, comprehensively study and restore the paleogeomorphology to determine the original thickness H of each set of limestone geothermal reservoirs drilled by the well before weathering and erosion.

[0085] According to the residual thickness h of the drilled limestone geothermal reservoir and the single-layer diagenetic time parameter β of each reservoir, calculate the weighted average value of the average diagenetic time parameter of all reservoirs drilled by the well through formula (1). Value.

[0086] The single-layer diagenetic time parameter β is a parameter that reflects the influence weight of the formation of each geological era on the degree of weathering and erosion of the formation due to the length of diagenetic time. The calculation formula is formula (2). The diagenetic time parameters β of the formations of each geological era are shown in Table 1.

[0087] Table 1

[0088]

[0089] According to the statistically residual thickness and original thickness of each set of drilled limestone geothermal reservoirs, as well as the average diagenetic time parameter Value, calculate the grade evaluation parameter α of the geothermal reservoir drilled by the well through formula (3).

[0090] According to the grade evaluation parameters, the grade of the geothermal reservoir drilled is evaluated. The smaller the grade evaluation parameter, the better the grade of the geothermal reservoir. Set the first grade evaluation parameter threshold and the second grade evaluation parameter threshold. In one example, if the grade evaluation parameter is less than the first grade evaluation parameter threshold, it is a type-I geothermal reservoir with great potential for geothermal development in the reservoir; if the grade evaluation parameter is greater than the first grade evaluation parameter threshold and less than the second grade evaluation parameter threshold, it is a type-II geothermal reservoir with medium potential for geothermal development in the reservoir; if the grade evaluation parameter is greater than the second grade evaluation parameter threshold, it is a type-III geothermal reservoir with poor potential for geothermal development in the reservoir.

[0091] The present invention also provides a parametric evaluation device for the grade of a limestone geothermal reservoir, including:

[0092] A comparison module, which conducts reservoir comparison and analysis for the target well to determine the residual thickness of each set of limestone geothermal reservoirs after weathering and erosion;

[0093] A restoration module, which comprehensively studies and restores the paleogeomorphology in combination with the distribution of regional geothermal reservoirs to determine the original thickness of each set of limestone geothermal reservoirs drilled by the target well before weathering and erosion;

[0094] An averaging module, which calculates the average diagenetic duration parameter of all the reservoirs drilled by the target well;

[0095] A calculation module, which calculates the grade evaluation parameter of the geothermal reservoir drilled by the target well;

[0096] An evaluation module, which evaluates the grade of the geothermal reservoir drilled according to the grade evaluation parameter.

[0097] In one example, the average diagenetic duration parameter of all the reservoirs drilled by the target well is calculated by formula (1):

[0098]

[0099] Wherein, is the average diagenetic duration parameter, h n is the residual thickness of the nth layer, β n is the single-layer diagenetic duration parameter β of the nth layer.

[0100] In one example, the single-layer diagenetic duration parameter β is a parameter reflecting the influence weight of the formation weathering and erosion degree due to the diagenetic time length of the strata in each geological era, and the calculation formula is:

[0101]

[0102] Wherein, t ∈ is the diagenetic time length of the Cambrian, t n is the diagenetic time length of the nth layer of strata.

[0103] In one example, the evaluation parameter of the geothermal reservoir encountered by the target well is calculated by formula (3):

[0104]

[0105] where α is the evaluation parameter of the geothermal reservoir encountered, h n is the residual thickness of the nth layer, and H n is the original thickness of the nth layer, and is the average diagenetic duration parameter.

[0106] In one example, the smaller the evaluation parameter of the grade, the better the grade of the geothermal reservoir.

[0107] In one example, it further includes:

[0108] Set the first grade evaluation parameter threshold and the second grade evaluation parameter threshold, and then conduct a classification evaluation for the reservoir.

[0109] In one example, if the evaluation parameter of the grade is less than the first grade evaluation parameter threshold, it is a type I geothermal reservoir, and the geothermal development potential of the reservoir is large;

[0110] If the evaluation parameter of the grade is greater than the first grade evaluation parameter threshold and less than the second grade evaluation parameter threshold, it is a type II geothermal reservoir, and the geothermal development potential of the reservoir is medium;

[0111] If the evaluation parameter of the grade is greater than the second grade evaluation parameter threshold, it is a type III geothermal reservoir, and the geothermal development potential of the reservoir is poor.

[0112] Specifically, using basic data such as drilling, logging, and well logging, conduct reservoir correlation analysis to determine the thickness of each set of limestone geothermal reservoirs encountered by the well, which is the residual thickness h after weathering and erosion of each set of limestone geothermal reservoirs.

[0113] Using paleogeomorphic research methods such as the impression method and the residual thickness method, combined with the distribution of regional geothermal reservoirs, comprehensively study and restore the paleogeomorphology to determine the original thickness H before weathering and erosion of each set of limestone geothermal reservoirs encountered by the well.

[0114] According to the residual thickness h of the encountered limestone geothermal reservoir and the single-layer diagenetic duration parameter β of each reservoir, calculate the average diagenetic duration parameter of all encountered reservoirs of the well by weighted average through formula (1) value.

[0115] The single-layer diagenetic duration parameter β is a parameter that reflects the influence weight of the formation weathering and erosion degree due to the diagenetic time length of the strata in each geological era. The calculation formula is formula (2). The diagenetic duration parameters β of the strata in each geological era are shown in Table 1.

[0116] Based on the residual thickness and original thickness of each set of drilled limestone geothermal reservoirs, as well as the average diagenetic duration parameter value, calculate the geothermal reservoir grade evaluation parameter α of this well through formula (3).

[0117] According to the grade evaluation parameter, evaluate the grade of the drilled geothermal reservoir. The smaller the grade evaluation parameter, the better the grade of the geothermal reservoir. Set the first grade evaluation parameter threshold and the second grade evaluation parameter threshold. In one example, if the grade evaluation parameter is less than the first grade evaluation parameter threshold, it is a first-class geothermal reservoir with great geothermal development potential; if the grade evaluation parameter is greater than the first grade evaluation parameter threshold and less than the second grade evaluation parameter threshold, it is a second-class geothermal reservoir with medium geothermal development potential; if the grade evaluation parameter is greater than the second grade evaluation parameter threshold, it is a third-class geothermal reservoir with poor geothermal development potential.

[0118] The present invention also provides an electronic device, which includes: a memory storing executable instructions; a processor that runs the executable instructions in the memory to implement the above-mentioned parametric evaluation method for the grade of limestone geothermal reservoirs.

[0119] The present invention also provides a computer-readable storage medium, which stores a computer program that implements the above-mentioned parametric evaluation method for the grade of limestone geothermal reservoirs when executed by a processor.

[0120] To facilitate understanding of the solution and its effects of the embodiments of the present invention, the following gives four specific application examples. Those skilled in the art should understand that this example is only for facilitating the understanding of the present invention, and any specific details are not intended to limit the present invention in any way.

[0121] Example 1

[0122] Figure 1 Shows a flowchart of the steps of the parametric evaluation method for the grade of limestone geothermal reservoirs according to the present invention.

[0123] As Figure 1 shown, the parametric evaluation method for the grade of limestone geothermal reservoirs includes: Step 101, conduct reservoir contrast analysis for the target well to determine the residual thickness of each set of limestone geothermal reservoirs after weathering and erosion; Step 102, combined with the distribution of regional geothermal reservoirs, comprehensively study and restore the paleogeomorphology to determine the original thickness of each set of limestone geothermal reservoirs drilled by the target well before weathering and erosion; Step 103, calculate the average diagenetic duration parameter of all reservoirs drilled by the target well; Step 104, calculate the geothermal reservoir grade evaluation parameter of the target well; Step 105, evaluate the grade of the drilled geothermal reservoir according to the grade evaluation parameter.

[0124] Taking some areas in southern North China as an example, using basic data such as drilling, logging, and well logging, reservoir correlation analysis is carried out to determine the thickness of each set of limestone geothermal reservoirs drilled by this well, which is the residual thickness h after weathering and erosion of each set of limestone geothermal reservoirs.

[0125] Using paleogeomorphic research methods such as the impression method and the residual thickness method, combined with the distribution of regional geothermal reservoirs, the paleogeomorphology is comprehensively studied and restored to determine the original thickness H of each set of limestone geothermal reservoirs before weathering and erosion drilled by this well.

[0126] According to the residual thickness h of the drilled limestone geothermal reservoir and the single-layer diagenetic duration parameter β of each reservoir, the average diagenetic duration parameter of all reservoirs drilled by this well is calculated by weighted average through formula (1). Value.

[0127] The single-layer diagenetic duration parameter β is a parameter that reflects the influence weight of the formation weathering and erosion degree due to the diagenetic time length of strata in each geological era, and the calculation formula is formula (2).

[0128] According to the statistically residual thickness and original thickness of each set of drilled limestone geothermal reservoirs, as well as the average diagenetic duration parameter Value, the geothermal reservoir grade evaluation parameter α of this well is calculated through formula (3).

[0129] According to the measured geothermal reservoir grade evaluation parameter α of each well, the grade of the geothermal reservoir drilled by each well is evaluated. The smaller the geothermal reservoir grade evaluation parameter α, the better the grade of the geothermal reservoir. Generally, when α is less than 10, it is a first-class geothermal reservoir with relatively large geothermal development potential; when α is greater than 10 and less than 30, it is a second-class geothermal reservoir with general geothermal development potential; when α is greater than 30, it is a third-class geothermal reservoir with poor geothermal development potential.

[0130] The finally obtained evaluation parameter table is shown in Table 2.

[0131] Table 2

[0132]

[0133] The results calculated by this method are consistent with the results of actual geothermal reservoir fine evaluation. It provides a quantitative index for geothermal reservoir grade evaluation.

[0134] Example 2

[0135] Figure 2 The block diagram of a parametric evaluation device for the grade of a limestone geothermal reservoir according to an embodiment of the present invention is shown.

[0136] As Figure 2 shown, the parametric evaluation device for the grade of the limestone geothermal reservoir includes:

[0137] The comparison module 201 conducts reservoir comparison and analysis for the target well to determine the remaining thickness of each set of limestone geothermal reservoirs after weathering and erosion.

[0138] The restoration module 202 comprehensively studies and restores the paleogeomorphology in combination with the distribution of regional geothermal reservoirs to determine the original thickness of each set of limestone geothermal reservoirs drilled by the target well before weathering and erosion.

[0139] The averaging module 203 calculates the average diagenetic duration parameter of all reservoirs drilled by the target well.

[0140] The calculation module 204 calculates the grade evaluation parameter of the geothermal reservoir drilled by the target well.

[0141] The evaluation module 205 evaluates the grade of the drilled geothermal reservoir according to the grade evaluation parameter.

[0142] As an alternative, the average diagenetic duration parameter of all reservoirs drilled by the target well is calculated by formula (1):

[0143]

[0144] Where, is the average diagenetic duration parameter, h n is the remaining thickness of the nth layer, β n is the single-layer diagenetic duration parameter β of the nth layer.

[0145] As an alternative, the single-layer diagenetic duration parameter β is a parameter reflecting the influence weight of the formation weathering and erosion degree due to the diagenetic time length of strata in each geological era. The calculation formula is:

[0146]

[0147] Where, t ∈ is the diagenetic time length of the Cambrian, t n is the diagenetic time length of the nth layer of strata.

[0148] As an alternative, the grade evaluation parameter of the geothermal reservoir drilled by the target well is calculated by formula (3):

[0149]

[0150] Where, α is the grade evaluation parameter of the drilled geothermal reservoir, h n is the remaining thickness of the nth layer, H n is the original thickness of the nth layer, is the average diagenetic duration parameter.

[0151] As an alternative, the smaller the grade evaluation parameter, the better the grade of the geothermal reservoir.

[0152] As an alternative, it also includes:

[0153] Set the threshold values of the first grade evaluation parameter and the second grade evaluation parameter, and then conduct a classification evaluation for the reservoir.

[0154] As an alternative, if the grade evaluation parameter is less than the threshold value of the first grade evaluation parameter, it is a type I geothermal reservoir with great potential for geothermal development in the reservoir.

[0155] If the grade evaluation parameter is greater than the threshold value of the first grade evaluation parameter and less than the threshold value of the second grade evaluation parameter, it is a type II geothermal reservoir with medium potential for geothermal development in the reservoir.

[0156] If the grade evaluation parameter is greater than the threshold value of the second grade evaluation parameter, it is a type III geothermal reservoir with poor potential for geothermal development in the reservoir.

[0157] Example 3

[0158] The present disclosure provides an electronic device, which includes: a memory storing executable instructions; a processor that runs the executable instructions in the memory to implement the above-mentioned parametric evaluation method for the grade of limestone geothermal reservoir.

[0159] The electronic device according to an embodiment of the present disclosure includes a memory and a processor.

[0160] The memory is used to store non-temporary computer-readable instructions. Specifically, the memory may include one or more computer program products, and the computer program products may include various forms of computer-readable storage media, such as volatile memory and / or non-volatile memory. The volatile memory may include, for example, random access memory (RAM) and / or cache memory, etc. The non-volatile memory may include, for example, read-only memory (ROM), hard disk, flash memory, etc.

[0161] The processor may be a central processing unit (CPU) or other forms of processing units with data processing capabilities and / or instruction execution capabilities, and may control other components in the electronic device to perform desired functions. In an embodiment of the present disclosure, the processor is used to run the computer-readable instructions stored in the memory.

[0162] Those skilled in the art should understand that, in order to solve the technical problem of how to obtain a good user experience effect, this embodiment may also include well-known structures such as communication buses and interfaces, and these well-known structures should also be included in the protection scope of the present disclosure.

[0163] For a detailed description of this embodiment, reference may be made to the corresponding descriptions in the foregoing embodiments, and details will not be repeated here.

[0164] Example 4

[0165] Embodiments of the present disclosure provide a computer-readable storage medium storing a computer program which, when executed by a processor, implements the above-described parametric evaluation method for the grade of limestone geothermal reservoir.

[0166] The computer-readable storage medium according to the embodiments of the present disclosure stores non-transitory computer-readable instructions. When the non-transitory computer-readable instructions are run by a processor, all or part of the steps of the methods of the various embodiments of the present disclosure described above are executed.

[0167] The above computer-readable storage medium includes, but is not limited to: optical storage media (e.g., CD-ROM and DVD), magneto-optical storage media (e.g., MO), magnetic storage media (e.g., magnetic tape or removable hard disk), media with built-in rewritable non-volatile memory (e.g., memory card), and media with built-in ROM (e.g., ROM cartridge).

[0168] Those skilled in the art should understand that the purpose of the above description of the embodiments of the present invention is only to exemplarily illustrate the beneficial effects of the embodiments of the present invention, and is not intended to limit the embodiments of the present invention to any of the examples given.

[0169] The various embodiments of the present invention have been described above. The above description is exemplary and not exhaustive, and is also not limited to the disclosed embodiments. Many modifications and variations are obvious to those of ordinary skill in the art without departing from the scope and spirit of the described embodiments.

Claims

1. A parametric evaluation method for the grade of a limestone geothermal reservoir, characterized in that, Including: Conduct reservoir contrast analysis for the target well to determine the residual thickness of each set of limestone geothermal reservoirs after weathering and erosion; Combined with the distribution of regional geothermal reservoirs, comprehensively study and restore the paleogeomorphology to determine the original thickness of each set of limestone geothermal reservoirs encountered by the target well before weathering and erosion; Calculate the average diagenetic duration parameter of all reservoirs encountered by the target well; Calculate the grade evaluation parameter of the geothermal reservoir encountered by the target well; Evaluate the grade of the geothermal reservoir encountered according to the grade evaluation parameter.

2. The parametric evaluation method for the grade of limestone geothermal reservoir according to claim 1, wherein, Calculate the average diagenetic duration parameter of all reservoirs encountered by the target well through formula (1): Among them, is the average diagenetic duration parameter, h n is the residual thickness of the nth layer, β n is the single-layer diagenetic duration parameter β of the nth layer.

3. The parametric evaluation method for the grade of limestone geothermal reservoir according to claim 2, wherein, The single-layer diagenetic duration parameter β is a parameter reflecting the influence weight of the diagenetic time length of strata in each geological era on the degree of weathering and erosion of the strata. The calculation formula is: Among them, t ∈ is the Cambrian diagenetic time length, and t n is the diagenetic time length of the nth layer of strata.

4. The parametric evaluation method for the grade of limestone geothermal reservoir according to claim 1, wherein, Calculate the grade evaluation parameter of the geothermal reservoir encountered by the target well through formula (3): Among them, α is the evaluation parameter for the grade of the geothermal reservoir drilled, h n is the residual thickness of the nth layer, H n is the original thickness of the nth layer, is the average diagenesis duration parameter.

5. The parametric evaluation method for the grade of limestone geothermal reservoir according to claim 1, wherein, The smaller the grade evaluation parameter, the better the grade of the geothermal reservoir.

6. The parametric evaluation method for the grade of limestone geothermal reservoir according to claim 5, wherein, Also including: Set the first grade evaluation parameter threshold and the second grade evaluation parameter threshold, and then conduct classification evaluation for the reservoir.

7. The method for parametric evaluation of the grade of limestone geothermal reservoir according to claim 6, wherein, If the grade evaluation parameter is less than the first grade evaluation parameter threshold, it is a type I geothermal reservoir with great potential for geothermal development in the thermal reservoir; If the grade evaluation parameter is greater than the first grade evaluation parameter threshold and less than the second grade evaluation parameter threshold, it is a type II geothermal reservoir with medium potential for geothermal development in the thermal reservoir; If the grade evaluation parameter is greater than the second grade evaluation parameter threshold, it is a type III geothermal reservoir with poor potential for geothermal development in the thermal reservoir.

8. A parametric evaluation device for the grade of a limestone geothermal reservoir, characterized in that, Including: A contrast module that conducts reservoir contrast analysis for the target well to determine the residual thickness of each set of limestone geothermal reservoirs after weathering and erosion; A restoration module that combines the distribution of regional geothermal reservoirs, comprehensively studies and restores the paleogeomorphology to determine the original thickness of each set of limestone geothermal reservoirs encountered by the target well before weathering and erosion; An average module that calculates the average diagenetic duration parameter of all reservoirs encountered by the target well; A calculation module that calculates the grade evaluation parameter of the geothermal reservoir encountered by the target well; An evaluation module that evaluates the grade of the geothermal reservoir encountered according to the grade evaluation parameter.

9. An electronic device, characterized in that, The electronic device includes: A memory that stores executable instructions; A processor that runs the executable instructions in the memory to implement the parametric evaluation method for the grade of the limestone geothermal reservoir according to any one of claims 1-7.

10. A computer-readable storage medium, characterized in that, The computer-readable storage medium stores a computer program, and when the computer program is executed by a processor, it implements the parametric evaluation method for the grade of the limestone geothermal reservoir according to any one of claims 1-7.

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