A method, system, equipment and medium for assessing carbon dioxide sequestration capacity in saline aquifers.

Abstract

This invention relates to the field of carbon dioxide geological sequestration technology, and discloses a method, system, equipment and medium for assessing carbon dioxide sequestration in saline aquifers. By combining drilling data, seismic data and geological data, and fully considering the effectiveness and quality differences of saline aquifer reservoirs, a progressive geological evaluation method is adopted to objectively and accurately assess the carbon dioxide geological sequestration of different sections and the whole of deep saline aquifers. This can provide reliable data guidance for carbon dioxide geological sequestration and effectively promote the mitigation of the greenhouse effect.

Description

Technical Field

[0001] This invention relates to the field of carbon dioxide geological sequestration technology, and in particular to a method, system, equipment and medium for assessing the carbon dioxide sequestration capacity of saline aquifers. Background Technology

[0002] Carbon capture, utilization and storage (CCUS) refers to the technology of capturing and separating carbon dioxide from different carbon sources such as energy use, industrial production, biomass utilization exhaust gas, and air, and transporting it to suitable sites for utilization or storage, ultimately achieving carbon dioxide emission reduction.

[0003] Depending on the geological body being sealed, CCUS technology can generally be divided into two main categories: oil displacement utilization (CCUS) and saline water storage (CCS). The former aims to displace oil and gas and improve oil and gas recovery while also considering geological storage, while the latter aims to directly store carbon dioxide by injecting it into deep saline water layers to achieve long-term isolation of carbon dioxide from the atmosphere and mitigate the greenhouse effect.

[0004] Carbon dioxide geological reserves assessment mainly employs two methods: volumetric and mechanistic. However, the mechanistic method suffers from difficulties in parameter selection and inconsistent standards, leading to the prevalence of the volumetric method in carbon dioxide geological reserves assessment. Nevertheless, the volumetric method, in practical applications, only considers parameters such as reservoir area, thickness, porosity, storage factor, and net-to-gross ratio, failing to assess the overall reservoir quality, heterogeneity, and effectiveness. This results in low accuracy and poor guidance for carbon dioxide geological reserves assessment.

[0005] Therefore, a new method for assessing carbon dioxide sequestration in saline aquifers is urgently needed. Summary of the Invention

[0006] This invention provides a method, system, equipment, and medium for assessing carbon dioxide sequestration potential in saline aquifers, thereby addressing the shortcomings of existing technologies that fail to consider the differences in geological conditions of saline aquifer reservoirs and thus cannot accurately assess the geological sequestration potential of deep saline aquifers.

[0007] This invention provides a method for assessing carbon dioxide sequestration capacity in saline aquifers, comprising:

[0008] Obtain drilling data, seismic data, and geological data for the area to be evaluated;

[0009] Based on the drilling and geological data of the area to be evaluated, several favorable saline aquifer sealing and capping reservoir combinations were obtained for the area to be evaluated.

[0010] Based on the seismic data of the area to be evaluated, and based on several favorable saline aquifer sequestration cap-reservoir combinations in the area to be evaluated, the effective cap layer for carbon dioxide sequestration in the area to be evaluated is obtained.

[0011] Based on the geological data of the area to be evaluated, and based on the effective caprock for carbon dioxide sequestration in the area to be evaluated, the effective carbon dioxide sequestration reservoir in the area to be evaluated is obtained.

[0012] Based on the drilling data, seismic data, and geological data of the area to be evaluated, the reservoir sedimentary facies type, reservoir area, net reservoir thickness, average permeability, average porosity, carbon dioxide density, and saline water storage coefficient of the effective carbon dioxide storage reservoir in the area to be evaluated are obtained.

[0013] The reservoir volume of the effective carbon dioxide storage reservoir in the area to be evaluated is obtained based on the reservoir area, net reservoir thickness, and average porosity of the effective carbon dioxide storage reservoir in the area to be evaluated.

[0014] Based on the reservoir sedimentary facies type, reservoir thickness, and average permeability of the effective carbon dioxide storage reservoirs in the area to be evaluated, the quality assessment of the effective carbon dioxide storage reservoirs in the area to be evaluated is obtained.

[0015] Based on the reservoir volume, quality evaluation, average porosity, carbon dioxide density, and saline water layer sequestration coefficient of the effective carbon dioxide sequestration reservoir in the area to be evaluated, the effective carbon dioxide sequestration capacity of the effective carbon dioxide sequestration reservoir in the area to be evaluated is obtained.

[0016] According to the present invention, a method for assessing carbon dioxide sequestration in saline aquifers is provided, wherein several favorable saline aquifer sequestration cap-reservoir combinations are obtained based on drilling data and geological data of the area to be assessed, including:

[0017] Based on the drilling and geological data of the area to be evaluated, the sedimentary strata from the surface to the basement of the area to be evaluated are divided into several groups of saline aquifer cap-reservoir combinations.

[0018] Using the first preset screening criteria, several favorable saline aquifer-cap-reservoir combinations for the region to be evaluated are selected from several groups of saline aquifer-cap-reservoir combinations.

[0019] According to the present invention, a method for assessing carbon dioxide sequestration in a saline aquifer is provided, wherein, based on seismic data of the area to be assessed, and based on several favorable saline aquifer sequestration caprock combinations in the area to be assessed, an effective caprock for carbon dioxide sequestration in the area to be assessed is obtained, including:

[0020] Based on the seismic data of the area to be assessed, the spatial distribution characteristics of the caprock of several favorable saline aquifer reservoir-caprock combinations in the area to be assessed are analyzed and mapped.

[0021] Based on the analysis and mapping of the spatial distribution characteristics of caprocks in several favorable saline aquifer sequestration caprock combinations in the area to be evaluated, and through the second preset screening conditions, the effective caprocks for carbon dioxide sequestration in the area to be evaluated are obtained.

[0022] According to the present invention, a method for assessing carbon dioxide sequestration in a saline aquifer is provided, wherein the effective carbon dioxide sequestration reservoir in the area to be assessed is obtained based on the effective caprock of the area to be assessed, according to the geological data of the area to be assessed, comprising:

[0023] Based on the effective caprock of carbon dioxide storage in the area to be evaluated, the effective carbon dioxide storage reservoirs in the area to be evaluated are obtained that are located below the effective caprock in the vertical direction and within the effective caprock in the horizontal direction. The effective carbon dioxide storage reservoirs are then divided into several effective reservoir segments in the vertical direction.

[0024] According to the present invention, a method for assessing carbon dioxide sequestration in saline aquifers is provided, wherein the method obtains the reservoir sedimentary facies type, reservoir area, net reservoir thickness, average permeability, average porosity, carbon dioxide density, and saline aquifer sequestration coefficient of the effective carbon dioxide sequestration reservoir in the area to be assessed based on drilling data, seismic data, and geological data of the area to be assessed, including:

[0025] Based on drilling data, seismic data, and geological data of the area to be evaluated, the reservoir sedimentary facies type, reservoir area, net reservoir thickness, average permeability, average porosity, carbon dioxide density, and saline water sequestration coefficient of several effective reservoir segments in the area to be evaluated are obtained.

[0026] According to the present invention, a method for assessing carbon dioxide sequestration capacity in a saline aquifer is provided, wherein obtaining the reservoir volume of the effective carbon dioxide sequestration reservoir in the area to be assessed based on the reservoir area, net reservoir thickness, and average porosity of the effective carbon dioxide sequestration reservoir in the area to be assessed includes:

[0027] Based on the reservoir area, net reservoir thickness, and average porosity of several effective reservoir segments in the area to be evaluated, the reservoir volume of these segments is obtained using a first expression, whereby:

[0028]

[0029] In the first expression, V a A represents the reservoir volume of the effective reservoir segment a in the region to be evaluated. a H represents the reservoir area of ​​the effective reservoir segment a in the region to be evaluated. a This represents the net reservoir thickness of the effective reservoir segment a in the area to be evaluated. This represents the average porosity of the effective reservoir segment a in the region to be evaluated.

[0030] According to the present invention, a method for assessing carbon dioxide sequestration capacity in saline aquifers is provided, wherein the quality evaluation of the effective carbon dioxide sequestration reservoir in the area to be evaluated is obtained based on the reservoir sedimentary facies type, reservoir thickness, and average permeability of the effective carbon dioxide sequestration reservoir in the area to be evaluated, including:

[0031] Based on the reservoir sedimentary facies type, reservoir thickness, and average permeability of several effective reservoir segments in the area to be evaluated, the reservoir sedimentary background scoring coefficient, reservoir thickness scoring coefficient, and average permeability scoring coefficient of several effective reservoir segments in the area to be evaluated are obtained.

[0032] Based on the reservoir depositional background scoring coefficient, reservoir thickness scoring coefficient, and average permeability scoring coefficient of several effective reservoir segments in the area to be evaluated, the quality evaluation of several effective reservoir segments in the area to be evaluated is obtained through the second expression, whereby:

[0033] Q a =C1 a ·C2 a ·C3 a ,

[0034] In the second expression, Q a C1 represents the quality assessment of the effective reservoir section a in the area to be evaluated. a C2 represents the reservoir sedimentary background score coefficient for the effective reservoir segment a in the area to be evaluated. a C3 represents the reservoir thickness scoring coefficient for the effective reservoir segment a in the area to be evaluated. a The average permeability scoring coefficient represents the effective reservoir section a in the area to be evaluated.

[0035] According to the present invention, a method for assessing carbon dioxide sequestration capacity in a saline aquifer is provided, wherein the effective carbon dioxide sequestration capacity of the effective carbon dioxide sequestration reservoir in the area to be assessed is obtained based on the reservoir volume, quality evaluation, average porosity, carbon dioxide density, and saline aquifer sequestration coefficient of the effective carbon dioxide sequestration reservoir in the area to be assessed, including:

[0036] Based on the reservoir volume, quality evaluation, average porosity, carbon dioxide density, and saline water sequestration coefficient of several effective reservoir segments in the area to be evaluated, the effective carbon dioxide sequestration of several effective reservoir segments in the area to be evaluated is obtained through the third expression.

[0037] The effective carbon dioxide storage capacity of several effective reservoir segments in the area to be evaluated is combined to obtain the effective carbon dioxide storage capacity of the effective carbon dioxide storage reservoirs in the area to be evaluated.

[0038] The third expression is:

[0039] G a =Va ·Q a ·E a ·ρ a ,

[0040] In the third expression, G a V represents the effective carbon dioxide sequestration capacity of the effective reservoir section a in the area to be evaluated. a Q represents the reservoir volume of the effective reservoir segment a in the region to be evaluated. a E represents the quality assessment of the effective reservoir section a in the area to be evaluated. a ρ represents the saline water storage factor of the effective reservoir section a in the area to be evaluated. a This represents the carbon dioxide density of the effective reservoir segment a in the region to be evaluated.

[0041] The present invention also provides a system for assessing carbon dioxide sequestration capacity in saline aquifers, comprising:

[0042] The data acquisition module is used to acquire drilling data, seismic data, and geological data of the area to be evaluated.

[0043] The module for obtaining favorable caprock-reservoir combinations is used to: obtain several favorable saline aquifer caprock-reservoir combinations in the area to be evaluated based on drilling data and geological data of the area to be evaluated;

[0044] The effective caprock acquisition module is used to: obtain the effective caprock for carbon dioxide sequestration in the area to be assessed based on the seismic data of the area to be assessed and several favorable saline aquifer sequestration caprock combinations in the area to be assessed.

[0045] The effective reservoir acquisition module is used to: obtain the effective carbon dioxide storage reservoir in the area to be evaluated based on the effective caprock of carbon dioxide storage in the area to be evaluated, according to the geological data of the area to be evaluated.

[0046] The data processing module is used to obtain, based on the drilling data, seismic data, and geological data of the area to be evaluated, the reservoir sedimentary facies type, reservoir area, net reservoir thickness, average permeability, average porosity, carbon dioxide density, and saline water storage coefficient of the effective carbon dioxide storage reservoir in the area to be evaluated.

[0047] The reservoir volume acquisition module is used to: obtain the reservoir volume of the effective carbon dioxide storage reservoir in the area to be evaluated based on the reservoir area, net reservoir thickness, and average porosity of the effective carbon dioxide storage reservoir in the area to be evaluated.

[0048] The quality assessment module is used to: obtain the quality assessment of the effective carbon dioxide storage reservoirs in the area to be assessed based on the reservoir sedimentary facies type, reservoir thickness, and average permeability of the effective carbon dioxide storage reservoirs in the area to be assessed.

[0049] The effective carbon dioxide storage capacity assessment module is used to: obtain the effective carbon dioxide storage capacity of the effective carbon dioxide storage reservoir in the area to be assessed based on the reservoir volume, quality evaluation, average porosity, carbon dioxide density, and saline water layer storage coefficient of the effective carbon dioxide storage reservoir in the area to be assessed.

[0050] The present invention also provides an electronic device, including a processor and a memory storing a computer program, wherein the processor executes the computer program to implement any of the above-described methods for assessing carbon dioxide sequestration in saline aquifers.

[0051] The present invention also provides a non-transitory computer-readable storage medium having a computer program stored thereon, which, when executed by a processor, implements any of the above-described methods for assessing the carbon dioxide sequestration capacity of saline aquifers.

[0052] The present invention also provides a computer program product, the computer program product comprising a computer program that can be stored on a non-transitory computer-readable storage medium, and when the computer program is executed by a processor, the computer is able to execute any of the above-described methods for assessing the carbon dioxide sequestration capacity of saline aquifers.

[0053] This invention provides a method, system, equipment, and medium for assessing carbon dioxide sequestration in saline aquifers. Combining drilling data, seismic data, and geological data, and fully considering the effectiveness and quality differences of saline aquifer reservoirs, it adopts a progressive geological evaluation approach to objectively and accurately assess the geological carbon dioxide sequestration of different segments and the overall deep saline aquifer. This provides reliable data guidance for carbon dioxide geological sequestration, effectively promotes carbon neutrality, and mitigates the greenhouse effect. Attached Figure Description

[0054] To more clearly illustrate the technical solutions in this invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0055] Figure 1 This is a flowchart illustrating a method for assessing carbon dioxide sequestration capacity in saline aquifers provided by the present invention.

[0056] Figure 2 A schematic diagram showing how carbon dioxide density changes with temperature and pressure is shown.

[0057] Figure 3 This is a schematic diagram of a saline aquifer carbon dioxide sequestration assessment system provided by the present invention.

[0058] Figure 4This is a schematic diagram of the structure of the electronic device provided by the present invention. Detailed Implementation

[0059] To make the objectives, technical solutions, and advantages of this invention clearer, the technical solutions of this invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, embodiments of this invention, and should not be construed as limiting the invention. All other embodiments obtained by those skilled in the art based on the embodiments of this invention without creative effort are within the scope of protection of this invention. In the description of this invention, it should be understood that the terminology used is for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0060] Figure 1 This is a flowchart illustrating a method for assessing carbon dioxide sequestration in saline aquifers provided by the present invention. The executing entity of this method can be any applicable terminal-side device or network-side device, such as a saline aquifer carbon dioxide sequestration assessment device.

[0061] See Figure 1 The present invention provides a method for assessing carbon dioxide sequestration capacity in saline aquifers, which may include:

[0062] S110. Obtain drilling data, seismic data, and geological data for the area to be evaluated.

[0063] Specifically, drilling data can include data from drilling, logging, well testing, well completion, core sampling and analysis, and pre- and post-drilling studies; seismic data can include data from 2D and 3D seismic exploration, interpretation and analysis studies; and geological data can include data from stratigraphic correlation and division, structural analysis, and sedimentary studies.

[0064] S120. Based on the drilling data and geological data of the area to be evaluated, several favorable saline aquifer sealing and capping reservoir combinations are obtained for the area to be evaluated.

[0065] In one embodiment, S120 may include:

[0066] Based on the drilling and geological data of the area to be evaluated, the sedimentary strata from the surface to the basement of the area to be evaluated are divided into several groups of saline aquifer cap-reservoir combinations.

[0067] Using the first preset screening criteria, several favorable saline aquifer-cap-reservoir combinations for the region to be evaluated are selected from several groups of saline aquifer-cap-reservoir combinations.

[0068] The first preset screening criteria can be set according to the actual situation. For example, taking site A as an example, based on drilling data, geological data, etc., the sedimentary strata from the surface to the basement are divided into 1, 2, 3, 4, and 5, a total of 5 sets of saline aquifer sequestration cap-reservoir combinations consisting of caprock and reservoir. Among them, set 4 is not suitable for carbon dioxide sequestration due to the development of faults and poor sealing (fault density > 1 fault / km², fault gouge distribution rate SGR < 0.4), and set 5 is not suitable for carbon dioxide sequestration due to its excessive burial depth (reservoir top burial depth > 3500m). Therefore, sets 1, 2, and 3 are selected as the favorable saline aquifer sequestration cap-reservoir combinations for site A.

[0069] S130. Based on the seismic data of the area to be evaluated, and based on several favorable saline aquifer sequestration cap-reservoir combinations in the area to be evaluated, the effective cap layer for carbon dioxide sequestration in the area to be evaluated is obtained.

[0070] In one embodiment, S130 may include:

[0071] Based on the seismic data of the area to be assessed, the spatial distribution characteristics of the caprock of several favorable saline aquifer reservoir-caprock combinations in the area to be assessed are analyzed and mapped.

[0072] Based on the analysis and mapping of the spatial distribution characteristics of caprocks in several favorable saline aquifer sequestration caprock combinations in the area to be evaluated, and through the second preset screening conditions, the effective caprocks for carbon dioxide sequestration in the area to be evaluated are obtained.

[0073] S130 can determine the distribution range of caprock in areas where the bottom burial depth meets the conditions for supercritical carbon dioxide temperature and pressure and safe storage (formation temperature > 31.1℃, formation pressure > 7.39MPa) on a plane. In addition, the second preset screening conditions can also be set according to actual conditions. For example, taking Site A as an example, the spatial distribution characteristics of the caprock of the first favorable saline aquifer storage caprock combination were analyzed and mapped. The high part of the structure is shallow (under normal formation temperature and pressure conditions, the geothermal temperature meets the requirements, but the depth of the highest point of the caprock bottom is <739m and the corresponding pressure is less than 7.39MPa, which does not meet the temperature and pressure conditions for supercritical carbon dioxide storage). Under storage conditions, there is a risk of supercritical carbon dioxide plume migration to the high part and phase change. The caprock of the second favorable saline aquifer storage caprock combination does not have this problem. Moreover, it is stably distributed in the region, completely covers Site A, and is shallower than the third caprock. Therefore, the caprock of the second favorable saline aquifer storage caprock combination is defined as the effective caprock for carbon dioxide storage in Site A. Its distribution range determines the evaluation range of carbon dioxide storage in Site A.

[0074] S140. Based on the geological data of the area to be evaluated, and based on the effective caprock of carbon dioxide storage in the area to be evaluated, the effective carbon dioxide storage reservoir in the area to be evaluated is obtained.

[0075] In one embodiment, S140 may include:

[0076] Based on the effective caprock of carbon dioxide storage in the area to be evaluated, the effective carbon dioxide storage reservoirs in the area to be evaluated are obtained that are located below the effective caprock in the vertical direction and within the effective caprock in the horizontal direction. The effective carbon dioxide storage reservoirs are then divided into several effective reservoir segments in the vertical direction.

[0077] Taking Site A as an example, the second and third favorable saline water reservoir-caprock combination, in addition to its main caprock and reservoir, also includes a secondary caprock composed of mudstone interlayers, and multiple reservoir segments divided by these interlayers. A broader (not limited to Site A) planar distribution analysis of these reservoirs can be conducted using geological data. If the distribution range of a certain reservoir at high burial depth (the carbon dioxide migration target area) exceeds the effective caprock for carbon dioxide storage at Site A, then this reservoir is considered to have a storage safety risk and is an ineffective reservoir segment; the rest are considered effective reservoirs.

[0078] S150. Based on the drilling data, seismic data, and geological data of the area to be evaluated, obtain the reservoir sedimentary facies type, reservoir area, net reservoir thickness, average permeability, average porosity, carbon dioxide density, and saline water layer sequestration coefficient of the effective carbon dioxide sequestration reservoir in the area to be evaluated.

[0079] In one embodiment, S150 can obtain the reservoir sedimentary facies type (e.g., deltaic, meandering river, littoral-shallow lacustrine facies), reservoir area, net reservoir thickness, average permeability, average porosity, carbon dioxide density, and saline water sequestration coefficient of several effective reservoir segments in the area to be evaluated based on drilling data, seismic data, and geological data of the area to be evaluated.

[0080] S160. Based on the reservoir area, net reservoir thickness, and average porosity of the effective carbon dioxide storage reservoir in the area to be evaluated, obtain the reservoir volume of the effective carbon dioxide storage reservoir in the area to be evaluated.

[0081] In one embodiment, S160 may include:

[0082] Based on the reservoir area, net reservoir thickness, and average porosity of several effective reservoir segments in the area to be evaluated, the reservoir volume of these segments is obtained using a first expression, whereby:

[0083]

[0084] In the first expression, V a A represents the reservoir volume (m³) of the effective reservoir segment a in the region to be evaluated. a The reservoir area (m²) and height (H) represent the effective reservoir segment 'a' in the area to be evaluated.a This represents the net reservoir thickness (in meters) of the effective reservoir segment 'a' in the area to be evaluated. This represents the average porosity of the effective reservoir section a in the region to be evaluated, expressed as %.

[0085] Taking site A as an example, the average net thickness H of the reservoirs in the clearly defined effective reservoir segments a, b, and c within the second and third favorable saline water sealing cap reservoir combinations can be obtained through seismic and drilling data. a H b H c Reservoir area A a A b A c average reservoir porosity Then the reservoir volume of the effective reservoir section of reservoir a reservoir volume of effective reservoir section b c. Reservoir volume of the effective reservoir section

[0086] Alternatively, the reservoir volume can be obtained through detailed interpretation of seismic data and software.

[0087] S170. Based on the reservoir sedimentary facies type, reservoir thickness, and average permeability of the effective carbon dioxide storage reservoir in the area to be evaluated, the quality evaluation of the effective carbon dioxide storage reservoir in the area to be evaluated is obtained.

[0088] In one embodiment, S170 may include:

[0089] Based on the reservoir sedimentary facies type, reservoir thickness, and average permeability of several effective reservoir segments in the area to be evaluated, the reservoir sedimentary background scoring coefficient, reservoir thickness scoring coefficient, and average permeability scoring coefficient of several effective reservoir segments in the area to be evaluated are obtained through a preset scoring coefficient table. See Tables 1-3 for details. The preset scoring tables include the reservoir sedimentary background scoring coefficient table, the reservoir thickness scoring coefficient table, and the average permeability scoring coefficient table.

[0090] Table 1. Scoring coefficients for reservoir sedimentary background

[0091]

[0092] Table 2 Scoring Coefficients for Effective Reservoir Thickness

[0093] Reservoir thickness (m) ＜10 10-20 20-50 50-100 ≥100 Reference coefficient 0.2 0.4 0.6 0.8 1

[0094] Table 3 Scoring Coefficients for Effective Reservoir Permeability

[0095]

[0096] Based on the reservoir depositional background scoring coefficient, reservoir thickness scoring coefficient, and average permeability scoring coefficient of several effective reservoir segments in the area to be evaluated, the quality evaluation of several effective reservoir segments in the area to be evaluated is obtained through the second expression, whereby:

[0097] Q a =C1 a ·C2 a ·C3 a ,

[0098] In the second expression, Q a C1 represents the quality assessment of the effective reservoir section a in the area to be evaluated. a C2 represents the reservoir sedimentary background score coefficient for the effective reservoir segment a in the area to be evaluated. a C3 represents the reservoir thickness scoring coefficient for the effective reservoir segment a in the area to be evaluated. a The average permeability scoring coefficient represents the effective reservoir section a in the area to be evaluated.

[0099] Taking site A as an example, the reservoir sedimentary facies types of effective reservoir sections a, b, and c are fluvial, lacustrine, and deltaic facies, respectively, with scores of 0.7, 0.95, and 1; the post-emergence thicknesses of effective reservoir sections a, b, and c are 25m, 65m, and 90m, respectively, with scores of 0.6, 0.8, and 0.8; and the average permeability of effective reservoir sections a, b, and c are 30mD, 280mD, and 1500mD, respectively, with scores of 0.6, 0.8, and 1.

[0100] The quality evaluations of effective reservoir sections a, b, and c are as follows:

[0101] Q a =0.7×0.6×0.6, find Q a It is 0.252.

[0102] Q b =0.95×0.8×0.8, find Q b It is 0.608.

[0103] Q c =1 × 0.8 × 1, find Q c It is 0.8.

[0104] S180. Based on the reservoir volume, quality evaluation, average porosity, carbon dioxide density, and saline water layer sequestration coefficient of the effective carbon dioxide sequestration reservoir in the area to be evaluated, the effective carbon dioxide sequestration capacity of the effective carbon dioxide sequestration reservoir in the area to be evaluated is obtained.

[0105] In one embodiment, S180 may include:

[0106] Based on the reservoir volume, quality evaluation, average porosity, carbon dioxide density, and saline water sequestration coefficient of several effective reservoir segments in the area to be evaluated, the effective carbon dioxide sequestration of several effective reservoir segments in the area to be evaluated is obtained through the third expression.

[0107] By combining the effective carbon dioxide sequestration of several effective reservoir segments in the area to be evaluated, the effective carbon dioxide sequestration of the effective reservoirs in the area to be evaluated is obtained through the fourth expression.

[0108] The third expression is:

[0109] G a =V a ·Q a ·E a ·ρ a ,

[0110] In the third expression, G a This represents the effective carbon dioxide sequestration capacity (kg, V) of reservoir section a in the area to be evaluated. a This represents the reservoir volume of the effective reservoir segment 'a' in the region to be evaluated, in m. 3 Q a E represents the quality assessment of the effective reservoir section a in the area to be evaluated. a ρ represents the saline water storage factor of the effective reservoir section a in the area to be evaluated. a This represents the carbon dioxide density of the effective reservoir section a in the area to be evaluated, in kg / m³. 3 ;

[0111] The fourth expression is:

[0112] G e =G a +G b +G c +...

[0113] In the fourth expression, G e G represents the effective carbon dioxide storage capacity of the effective reservoirs in the area to be evaluated, i.e., the effective carbon dioxide storage capacity of all effective reservoir segments in the area to be evaluated. a G b G c This indicates the effective carbon dioxide sequestration capacity of the effective reservoir sections a, b, and c in the area to be evaluated.

[0114] Taking site A as an example, the reservoir area A of the effective reservoir section a is obtained. a =1500km 2 Average reservoir thickness H a =50m, average porosity The storage coefficient value E was obtained by referring to numerical simulations of similar geological conditions.a =0.02, the carbon dioxide density ρ obtained from the temperature and pressure conditions corresponding to the reservoir depth. a =600kg / m 3 ( Figure 2 Quality evaluation Q a =0.252, and the effective carbon dioxide sequestration capacity G is obtained using the third expression. a It is 5.67 × 10 8 Kilograms. Using the same method, the effective carbon dioxide sequestration capacity G of effective reservoir sections b and c can be calculated separately. b G c , for G a G b G c The summation represents the effective carbon dioxide storage capacity of the effective carbon dioxide storage reservoir at site A.

[0115] This invention provides a method, system, equipment, and medium for assessing carbon dioxide sequestration in saline aquifers. Combining drilling data, seismic data, and geological data, and fully considering the effectiveness and quality differences of saline aquifer reservoirs, it adopts a progressive geological evaluation approach to objectively and accurately assess the geological carbon dioxide sequestration of different segments and the overall deep saline aquifer. This provides reliable data guidance for carbon dioxide geological sequestration, effectively promotes carbon neutrality, and mitigates the greenhouse effect.

[0116] The following describes the saline aquifer carbon dioxide sequestration assessment system provided by the present invention. The saline aquifer carbon dioxide sequestration assessment system described below can be referred to in correspondence with the saline aquifer carbon dioxide sequestration assessment method described above.

[0117] See Figure 3 The present invention provides a system for assessing carbon dioxide sequestration capacity in saline aquifers, which may include:

[0118] The data acquisition module is used to acquire drilling data, seismic data, and geological data of the area to be evaluated.

[0119] The module for obtaining favorable caprock-reservoir combinations is used to: obtain several favorable saline aquifer caprock-reservoir combinations in the area to be evaluated based on drilling data and geological data of the area to be evaluated;

[0120] The effective caprock acquisition module is used to: obtain the effective caprock for carbon dioxide sequestration in the area to be assessed based on the seismic data of the area to be assessed and several favorable saline aquifer sequestration caprock combinations in the area to be assessed.

[0121] The effective reservoir acquisition module is used to: obtain the effective carbon dioxide storage reservoir in the area to be evaluated based on the effective caprock of carbon dioxide storage in the area to be evaluated, according to the geological data of the area to be evaluated.

[0122] The data processing module is used to obtain, based on the drilling data, seismic data, and geological data of the area to be evaluated, the reservoir sedimentary facies type, reservoir area, net reservoir thickness, average permeability, average porosity, carbon dioxide density, and saline water storage coefficient of the effective carbon dioxide storage reservoir in the area to be evaluated.

[0123] The reservoir volume acquisition module is used to: obtain the reservoir volume of the effective carbon dioxide storage reservoir in the area to be evaluated based on the reservoir area, net reservoir thickness, and average porosity of the effective carbon dioxide storage reservoir in the area to be evaluated.

[0124] The quality assessment module is used to: obtain the quality assessment of the effective carbon dioxide storage reservoirs in the area to be assessed based on the reservoir sedimentary facies type, reservoir thickness, and average permeability of the effective carbon dioxide storage reservoirs in the area to be assessed.

[0125] The effective carbon dioxide storage capacity assessment module is used to: obtain the effective carbon dioxide storage capacity of the effective carbon dioxide storage reservoir in the area to be assessed based on the reservoir volume, quality evaluation, average porosity, carbon dioxide density, and saline water layer storage coefficient of the effective carbon dioxide storage reservoir in the area to be assessed.

[0126] Figure 4 An example is a schematic diagram of the physical structure of an electronic device, such as... Figure 4 As shown, the electronic device may include a processor 810, a communications interface 820, a memory 830, and a communication bus 840, wherein the processor 810, the communications interface 820, and the memory 830 communicate with each other via the communication bus 840. The processor 810 can call logical instructions in the memory 830 to execute the following steps:

[0127] Obtain drilling data, seismic data, and geological data for the area to be evaluated;

[0128] Based on the drilling and geological data of the area to be evaluated, several favorable saline aquifer sealing and capping reservoir combinations were obtained for the area to be evaluated.

[0129] Based on the seismic data of the area to be evaluated, and based on several favorable saline aquifer sequestration cap-reservoir combinations in the area to be evaluated, the effective cap layer for carbon dioxide sequestration in the area to be evaluated is obtained.

[0130] Based on the geological data of the area to be evaluated, and based on the effective caprock for carbon dioxide sequestration in the area to be evaluated, the effective carbon dioxide sequestration reservoir in the area to be evaluated is obtained.

[0131] Based on the drilling data, seismic data, and geological data of the area to be evaluated, the reservoir sedimentary facies type, reservoir area, net reservoir thickness, average permeability, average porosity, carbon dioxide density, and saline water storage coefficient of the effective carbon dioxide storage reservoir in the area to be evaluated are obtained.

[0132] The reservoir volume of the effective carbon dioxide storage reservoir in the area to be evaluated is obtained based on the reservoir area, net reservoir thickness, and average porosity of the effective carbon dioxide storage reservoir in the area to be evaluated.

[0133] Based on the reservoir sedimentary facies type, reservoir thickness, and average permeability of the effective carbon dioxide storage reservoirs in the area to be evaluated, the quality assessment of the effective carbon dioxide storage reservoirs in the area to be evaluated is obtained.

[0134] Based on the reservoir volume, quality evaluation, average porosity, carbon dioxide density, and saline water layer sequestration coefficient of the effective carbon dioxide sequestration reservoir in the area to be evaluated, the effective carbon dioxide sequestration capacity of the effective carbon dioxide sequestration reservoir in the area to be evaluated is obtained.

[0135] Furthermore, the logical instructions in the aforementioned memory 830 can be implemented as software functional units and, when sold or used as independent products, can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of the present invention, essentially, or the part that contributes to the prior art, or a part of the technical solution, can be embodied in the form of a software product. This computer software product is stored in a storage medium and includes several instructions to cause a computer device (which may be a personal computer, server, or network device, etc.) to execute all or part of the steps of the methods described in the various embodiments of the present invention. The aforementioned storage medium includes various media capable of storing program code, such as USB flash drives, portable hard drives, read-only memory (ROM), random access memory (RAM), magnetic disks, or optical disks.

[0136] On the other hand, the present invention also provides a computer program product, the computer program product comprising a computer program, the computer program being able to be stored on a non-transitory computer-readable storage medium, and the computer program being executed by a processor, enabling the computer to perform the following steps:

[0137] Obtain drilling data, seismic data, and geological data for the area to be evaluated;

[0138] Based on the drilling and geological data of the area to be evaluated, several favorable saline aquifer sealing and capping reservoir combinations were obtained for the area to be evaluated.

[0139] Based on the seismic data of the area to be evaluated, and based on several favorable saline aquifer sequestration cap-reservoir combinations in the area to be evaluated, the effective cap layer for carbon dioxide sequestration in the area to be evaluated is obtained.

[0140] Based on the geological data of the area to be evaluated, and based on the effective caprock for carbon dioxide sequestration in the area to be evaluated, the effective carbon dioxide sequestration reservoir in the area to be evaluated is obtained.

[0141] Based on the drilling data, seismic data, and geological data of the area to be evaluated, the reservoir sedimentary facies type, reservoir area, net reservoir thickness, average permeability, average porosity, carbon dioxide density, and saline water storage coefficient of the effective carbon dioxide storage reservoir in the area to be evaluated are obtained.

[0142] The reservoir volume of the effective carbon dioxide storage reservoir in the area to be evaluated is obtained based on the reservoir area, net reservoir thickness, and average porosity of the effective carbon dioxide storage reservoir in the area to be evaluated.

[0143] Based on the reservoir sedimentary facies type, reservoir thickness, and average permeability of the effective carbon dioxide storage reservoirs in the area to be evaluated, the quality assessment of the effective carbon dioxide storage reservoirs in the area to be evaluated is obtained.

[0144] Based on the reservoir volume, quality evaluation, average porosity, carbon dioxide density, and saline water layer sequestration coefficient of the effective carbon dioxide sequestration reservoir in the area to be evaluated, the effective carbon dioxide sequestration capacity of the effective carbon dioxide sequestration reservoir in the area to be evaluated is obtained.

[0145] In another aspect, the present invention also provides a non-transitory computer-readable storage medium having a computer program stored thereon, which, when executed by a processor, performs the following steps:

[0146] Obtain drilling data, seismic data, and geological data for the area to be evaluated;

[0147] Based on the drilling and geological data of the area to be evaluated, several favorable saline aquifer sealing and capping reservoir combinations were obtained for the area to be evaluated.

[0148] Based on the seismic data of the area to be evaluated, and based on several favorable saline aquifer sequestration cap-reservoir combinations in the area to be evaluated, the effective cap layer for carbon dioxide sequestration in the area to be evaluated is obtained.

[0149] Based on the geological data of the area to be evaluated, and based on the effective caprock for carbon dioxide sequestration in the area to be evaluated, the effective carbon dioxide sequestration reservoir in the area to be evaluated is obtained.

[0150] Based on the drilling data, seismic data, and geological data of the area to be evaluated, the reservoir sedimentary facies type, reservoir area, net reservoir thickness, average permeability, average porosity, carbon dioxide density, and saline water storage coefficient of the effective carbon dioxide storage reservoir in the area to be evaluated are obtained.

[0151] The reservoir volume of the effective carbon dioxide storage reservoir in the area to be evaluated is obtained based on the reservoir area, net reservoir thickness, and average porosity of the effective carbon dioxide storage reservoir in the area to be evaluated.

[0152] Based on the reservoir sedimentary facies type, reservoir thickness, and average permeability of the effective carbon dioxide storage reservoirs in the area to be evaluated, the quality assessment of the effective carbon dioxide storage reservoirs in the area to be evaluated is obtained.

[0153] Based on the reservoir volume, quality evaluation, average porosity, carbon dioxide density, and saline water layer sequestration coefficient of the effective carbon dioxide sequestration reservoir in the area to be evaluated, the effective carbon dioxide sequestration capacity of the effective carbon dioxide sequestration reservoir in the area to be evaluated is obtained.

[0154] The device embodiments described above are merely illustrative. The units described as separate components may or may not be physically separate. The components shown as units may or may not be physical units; that is, they may be located in one place or distributed across multiple network units. Some or all of the modules can be selected to achieve the purpose of this embodiment according to actual needs. Those skilled in the art can understand and implement this without any creative effort.

[0155] Through the above description of the embodiments, those skilled in the art can clearly understand that each embodiment can be implemented by means of software plus necessary general-purpose hardware platforms, and of course, it can also be implemented by hardware. Based on this understanding, the above technical solutions, in essence or the part that contributes to the prior art, can be embodied in the form of a software product. This computer software product can be stored in a computer-readable storage medium, such as ROM / RAM, magnetic disk, optical disk, etc., and includes several instructions to cause a computer device (which may be a personal computer, server, or network device, etc.) to execute the methods described in the various embodiments or some parts of the embodiments.

[0156] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A method for assessing the carbon dioxide sequestration capacity of a saline aquifer, characterized in that, include: Obtain drilling data, seismic data, and geological data for the area to be evaluated; Based on the drilling and geological data of the area to be evaluated, several favorable saline aquifer sealing and capping reservoir combinations were obtained for the area to be evaluated. Based on the seismic data of the area to be evaluated, and based on several favorable saline aquifer sequestration cap-reservoir combinations in the area to be evaluated, the effective cap layer for carbon dioxide sequestration in the area to be evaluated is obtained. Based on the geological data of the area to be evaluated, and based on the effective caprock for carbon dioxide sequestration in the area to be evaluated, the effective carbon dioxide sequestration reservoir in the area to be evaluated is obtained. Based on the drilling data, seismic data, and geological data of the area to be evaluated, the reservoir sedimentary facies type, reservoir area, net reservoir thickness, average permeability, average porosity, carbon dioxide density, and saline water storage coefficient of the effective carbon dioxide storage reservoir in the area to be evaluated are obtained. The reservoir volume of the effective carbon dioxide storage reservoir in the area to be evaluated is obtained based on the reservoir area, net reservoir thickness, and average porosity of the effective carbon dioxide storage reservoir in the area to be evaluated. Based on the reservoir sedimentary facies type, reservoir thickness, and average permeability of the effective carbon dioxide storage reservoirs in the area to be evaluated, the quality assessment of the effective carbon dioxide storage reservoirs in the area to be evaluated is obtained. Based on the reservoir volume, quality evaluation, average porosity, carbon dioxide density, and saline water layer sequestration coefficient of the effective carbon dioxide sequestration reservoir in the area to be evaluated, the effective carbon dioxide sequestration capacity of the effective carbon dioxide sequestration reservoir in the area to be evaluated is obtained.

2. The method for assessing carbon dioxide sequestration capacity in saline aquifers according to claim 1, characterized in that, Based on drilling and geological data of the area to be evaluated, several favorable saline aquifer cap-reservoir combinations are obtained for the area to be evaluated, including: Based on the drilling and geological data of the area to be evaluated, the sedimentary strata from the surface to the basement of the area to be evaluated are divided into several groups of saline aquifer cap-reservoir combinations. Using the first preset screening criteria, several favorable saline aquifer-cap-reservoir combinations for the region to be evaluated are selected from several groups of saline aquifer-cap-reservoir combinations.

3. The method for assessing carbon dioxide sequestration in saline aquifers according to claim 2, characterized in that, Based on seismic data of the area to be assessed, and based on several favorable saline aquifer-caprock combinations in the area to be assessed, the effective caprock for carbon dioxide sequestration in the area to be assessed is obtained, including: Based on the seismic data of the area to be assessed, the spatial distribution characteristics of the caprock of several favorable saline aquifer reservoir-caprock combinations in the area to be assessed are analyzed and mapped. Based on the analysis and mapping of the spatial distribution characteristics of caprocks in several favorable saline aquifer sequestration caprock combinations in the area to be evaluated, and through the second preset screening conditions, the effective caprocks for carbon dioxide sequestration in the area to be evaluated are obtained.

4. The method for assessing carbon dioxide sequestration capacity in saline aquifers according to claim 3, characterized in that, The process of obtaining the effective carbon dioxide storage reservoir in the area to be evaluated based on the geological data of the area to be evaluated and the effective caprock of the area to be evaluated includes: Based on the effective caprock of carbon dioxide storage in the area to be evaluated, the effective carbon dioxide storage reservoirs within the area to be evaluated are identified vertically below the effective caprock and horizontally within the effective caprock. These effective carbon dioxide storage reservoirs are then vertically divided into several effective reservoir segments; and... The process involves obtaining, based on drilling, seismic, and geological data of the area to be evaluated, the reservoir sedimentary facies type, reservoir area, net reservoir thickness, average permeability, average porosity, carbon dioxide density, and saline water storage coefficient of the effective carbon dioxide storage reservoir in the area to be evaluated, including: Based on drilling data, seismic data, and geological data of the area to be evaluated, the reservoir sedimentary facies type, reservoir area, net reservoir thickness, average permeability, average porosity, carbon dioxide density, and saline water sequestration coefficient of several effective reservoir segments in the area to be evaluated are obtained.

5. The method for assessing carbon dioxide sequestration capacity in saline aquifers according to claim 4, characterized in that, The process of obtaining the reservoir volume of the effective carbon dioxide storage reservoir in the area to be evaluated based on the reservoir area, net reservoir thickness, and average porosity of the effective carbon dioxide storage reservoir in the area to be evaluated includes: Based on the reservoir area, net reservoir thickness, and average porosity of several effective reservoir segments in the area to be evaluated, the reservoir volume of these segments is obtained using a first expression, whereby: In the first expression, V a A represents the reservoir volume of the effective reservoir segment a in the region to be evaluated. a H represents the reservoir area of ​​the effective reservoir segment a in the region to be evaluated. a This represents the net reservoir thickness of the effective reservoir segment a in the area to be evaluated. This represents the average porosity of the effective reservoir segment a in the region to be evaluated.

6. The method for assessing carbon dioxide sequestration in saline aquifers according to claim 5, characterized in that, The quality evaluation of the effective carbon dioxide storage reservoirs in the area to be evaluated is obtained based on the reservoir sedimentary facies type, reservoir thickness, and average permeability, including: Based on the reservoir sedimentary facies type, reservoir thickness, and average permeability of several effective reservoir segments in the area to be evaluated, the reservoir sedimentary background scoring coefficient, reservoir thickness scoring coefficient, and average permeability scoring coefficient of several effective reservoir segments in the area to be evaluated are obtained. Based on the reservoir depositional background scoring coefficient, reservoir thickness scoring coefficient, and average permeability scoring coefficient of several effective reservoir segments in the area to be evaluated, the quality evaluation of several effective reservoir segments in the area to be evaluated is obtained through the second expression, whereby: Q a =C1 a ·C2 a ·C3 a , In the second expression, Q a C1 represents the quality assessment of the effective reservoir section a in the area to be evaluated. a C2 represents the reservoir sedimentary background score coefficient for the effective reservoir segment a in the area to be evaluated. a C3 represents the reservoir thickness scoring coefficient for the effective reservoir segment a in the area to be evaluated. a The average permeability scoring coefficient represents the effective reservoir section a in the area to be evaluated.

7. The method for assessing carbon dioxide sequestration capacity in saline aquifers according to claim 6, characterized in that, The effective carbon dioxide storage capacity of the effective carbon dioxide storage reservoir in the area to be evaluated is obtained based on the reservoir volume, quality assessment, average porosity, carbon dioxide density, and saline water storage coefficient of the effective carbon dioxide storage reservoir in the area to be evaluated, including: Based on the reservoir volume, quality evaluation, average porosity, carbon dioxide density, and saline water sequestration coefficient of several effective reservoir segments in the area to be evaluated, the effective carbon dioxide sequestration of several effective reservoir segments in the area to be evaluated is obtained through the third expression. The effective carbon dioxide storage capacity of several effective reservoir segments in the area to be evaluated is combined to obtain the effective carbon dioxide storage capacity of the effective carbon dioxide storage reservoirs in the area to be evaluated. The third expression is: G a =V a ·Q a ·E a ·r a , In the third expression, G a V represents the effective carbon dioxide sequestration capacity of the effective reservoir section a in the area to be evaluated. a Q represents the reservoir volume of the effective reservoir segment a in the region to be evaluated. a E represents the quality assessment of the effective reservoir section a in the area to be evaluated. a ρ represents the saline water storage factor of the effective reservoir section a in the area to be evaluated. a This represents the carbon dioxide density of the effective reservoir segment a in the region to be evaluated.

8. A system for assessing carbon dioxide sequestration capacity in saline aquifers, characterized in that, include: The data acquisition module is used to acquire drilling data, seismic data, and geological data of the area to be evaluated. The module for obtaining favorable caprock-reservoir combinations is used to: obtain several favorable saline aquifer caprock-reservoir combinations in the area to be evaluated based on drilling data and geological data of the area to be evaluated; The effective caprock acquisition module is used to: obtain the effective caprock for carbon dioxide sequestration in the area to be assessed based on the seismic data of the area to be assessed and several favorable saline aquifer sequestration caprock combinations in the area to be assessed. The effective reservoir acquisition module is used to: obtain the effective carbon dioxide storage reservoir in the area to be evaluated based on the effective caprock of carbon dioxide storage in the area to be evaluated, according to the geological data of the area to be evaluated. The data processing module is used to obtain, based on the drilling data, seismic data, and geological data of the area to be evaluated, the reservoir sedimentary facies type, reservoir area, net reservoir thickness, average permeability, average porosity, carbon dioxide density, and saline water storage coefficient of the effective carbon dioxide storage reservoir in the area to be evaluated. The reservoir volume acquisition module is used to: obtain the reservoir volume of the effective carbon dioxide storage reservoir in the area to be evaluated based on the reservoir area, net reservoir thickness, and average porosity of the effective carbon dioxide storage reservoir in the area to be evaluated. The quality evaluation module is used to: obtain the quality evaluation of the effective carbon dioxide storage reservoir in the area to be evaluated based on the reservoir sedimentary facies type, reservoir thickness, and average permeability; the effective storage capacity evaluation module is used to: obtain the effective carbon dioxide storage capacity of the effective carbon dioxide storage reservoir in the area to be evaluated based on the reservoir volume, quality evaluation, average porosity, carbon dioxide density, and saline water layer storage coefficient.

9. An electronic 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 assessing the carbon dioxide sequestration capacity of a saline aquifer as described in any one of claims 1 to 7.

10. A non-transitory computer-readable storage medium having a computer program stored thereon, characterized in that, When the computer program is executed by the processor, it implements the method for assessing the carbon dioxide sequestration capacity of a saline aquifer as described in any one of claims 1 to 7.

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