Method, system, equipment and medium for evaluating storage amount of carbon dioxide in saline water layer

Abstract

The invention relates to the technical field of carbon dioxide geological sequestration, and discloses a method, a system, equipment and a medium for evaluating the carbon dioxide sequestration amount of a salt water reservoir, which are used for evaluating the carbon dioxide sequestration amount of the salt water reservoir by combining well drilling data, seismic data and geological data, fully considering the effectiveness and quality difference of the salt water reservoir and adopting a step-by-step progressive geological evaluation mode. Objective and accurate carbon dioxide geological sequestration quantity evaluation is carried out on different layer sections and the whole of the deep saline water layer, reliable data guidance can be provided for carbon dioxide geological sequestration, and the greenhouse effect is effectively promoted and relieved.

Description

Technical Field

[0001] The present invention relates to the technical field of geological storage of carbon dioxide, and in particular to a method, system, equipment and medium for evaluating the storage amount of carbon dioxide in a saline layer. Background Art

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

[0003] Depending on the different geological bodies for storage, CCUS technology can usually be divided into two categories: oil recovery utilization (CCUS) and saline aquifer storage (CCS). The former aims to displace oil and gas and improve oil and gas recovery, while taking geological storage into consideration. The latter aims at direct storage, injecting carbon dioxide into deep saline aquifers to achieve long-term isolation of carbon dioxide from the atmosphere and mitigate the greenhouse effect.

[0004] There are two main methods for assessing the geological storage of carbon dioxide: the volumetric method and the mechanism method. Since the mechanism method has problems such as difficulty in obtaining parameter values ​​and inconsistent standards during use, the volumetric method is usually used in the assessment of the geological storage of carbon dioxide. However, in specific applications, the volumetric method only considers parameters such as the area, thickness, porosity, storage coefficient, and net-to-gross ratio of the reservoir, and is unable to assess the overall quality, heterogeneity, and effectiveness of the reservoir, resulting in low accuracy and poor guidance of the assessment results of the geological storage of carbon dioxide.

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

[0006] The present invention provides a method, system, device and medium for assessing the storage capacity of carbon dioxide in a saline aquifer, so as to solve the defect that the prior art fails to take into account the differences in geological conditions of saline aquifer reservoirs and fails to accurately assess the geological storage potential of carbon dioxide in deep saline aquifers.

[0007] The present invention provides a method for assessing the storage capacity of carbon dioxide in a saline layer, comprising:

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

[0009] According to the drilling data and geological data of the area to be evaluated, several favorable saline water layer sealing and capping reservoir combinations in the area to be evaluated are obtained;

[0010] According to the seismic data of the area to be assessed, based on several favorable saline water layer storage and cap reservoir combinations in the area to be assessed, the effective cap rock for carbon dioxide storage in the area to be assessed is obtained;

[0011] According to the geological data of the area to be assessed, based on the effective cap rock for carbon dioxide storage in the area to be assessed, an effective reservoir for carbon dioxide storage in the area to be assessed is obtained;

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

[0013] Obtaining the reservoir volume of the effective reservoir for carbon dioxide storage in the area to be assessed based on the reservoir area, net reservoir thickness and average porosity of the effective reservoir for carbon dioxide storage in the area to be assessed;

[0014] According to the reservoir sedimentary facies type, reservoir thickness and average permeability of the effective reservoir for carbon dioxide storage in the area to be evaluated, the quality evaluation of the effective reservoir for carbon dioxide storage in the area to be evaluated is obtained;

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

[0016] According to a method for assessing the storage capacity of carbon dioxide in a saline aquifer provided by the present invention, the method comprises obtaining several favorable saline aquifer storage and capping combinations in the area to be assessed based on the drilling data and geological data of the area to be assessed, including:

[0017] Based on the drilling data 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 water layer sealing and capping reservoir combinations;

[0018] Through the first preset screening condition, several favorable saline aquifer sealing and capping reservoir combinations are screened out from several groups of saline aquifer sealing and capping reservoir combinations for the area to be evaluated.

[0019] According to a method for assessing the carbon dioxide storage capacity of a saline aquifer provided by the present invention, the effective cap rock for carbon dioxide storage in the area to be assessed is obtained based on seismic data of the area to be assessed and several favorable saline aquifer storage-cap reservoir combinations in the area to be assessed, including:

[0020] Based on the seismic data of the area to be assessed, the spatial distribution characteristics of the caprocks of several favorable saline water layer sealing and reservoir combinations in the area to be assessed are analyzed and mapped;

[0021] The spatial distribution characteristics of the caprocks of several favorable saline layer storage and reservoir combinations in the area to be evaluated are analyzed and mapped, and the effective caprocks for carbon dioxide storage in the area to be evaluated are obtained through the second preset screening condition.

[0022] According to a method for assessing the carbon dioxide storage capacity of a saline layer provided by the present invention, the method of obtaining an effective carbon dioxide storage reservoir in the area to be assessed based on geological data of the area to be assessed and an effective carbon dioxide storage cap rock in the area to be assessed comprises:

[0023] Based on the effective cap rock for carbon dioxide storage in the area to be assessed, the effective reservoir for carbon dioxide storage in the area to be assessed that is located below the effective cap rock for carbon dioxide storage in the vertical direction and within the effective cap rock for carbon dioxide storage in the horizontal direction is obtained, and the effective reservoir for carbon dioxide storage is divided into a number of effective reservoir sections in the vertical direction.

[0024] According to a method for assessing the carbon dioxide storage capacity of a saline layer provided by the present invention, the reservoir sedimentary phase type, reservoir area, reservoir net thickness, average permeability, average porosity, carbon dioxide density, and saline layer storage coefficient of an effective reservoir for carbon dioxide storage in the area to be assessed are obtained based on drilling data, seismic data, and geological data of the area to be assessed, including:

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

[0026] According to a method for assessing the carbon dioxide storage capacity of a saline layer provided by the present invention, the reservoir volume of the effective carbon dioxide storage reservoir in the area to be assessed 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 assessed, including:

[0027] According to the reservoir area, net reservoir thickness and average porosity of several effective reservoir sections in the area to be evaluated, the reservoir volume of several effective reservoir sections in the area to be evaluated is obtained by the first expression, wherein the first expression is:

[0028]

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

[0030] According to a method for assessing the storage capacity of carbon dioxide in a saline layer provided by the present invention, the quality evaluation of the effective carbon dioxide storage reservoir in the area to be assessed is obtained based on the reservoir sedimentary phase type, reservoir thickness, and average permeability of the effective carbon dioxide storage reservoir in the area to be assessed, including:

[0031] According to the reservoir sedimentary facies type, reservoir thickness and average permeability of several effective reservoir sections in the area to be evaluated, reservoir sedimentary background scoring coefficients, reservoir thickness scoring coefficients and average permeability scoring coefficients of several effective reservoir sections in the area to be evaluated are obtained;

[0032] According to the reservoir sedimentary background scoring coefficient, reservoir thickness scoring coefficient and average permeability scoring coefficient of several effective reservoir sections in the area to be evaluated, the quality evaluation of several effective reservoir sections in the area to be evaluated is obtained through the second expression, wherein the second expression is:

[0033] Q a =C1 a C2 a C3 a ,

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

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

[0036] According to the reservoir volume, quality evaluation, average porosity, carbon dioxide density, and saline layer storage coefficient of several effective reservoir sections in the area to be evaluated, the effective carbon dioxide storage capacity of several effective reservoir sections in the area to be evaluated is obtained through a third expression;

[0037] The effective storage capacity of carbon dioxide in the effective reservoir for carbon dioxide storage in the area to be evaluated is obtained by integrating the effective storage capacity of carbon dioxide in several effective reservoir sections in the area to be evaluated;

[0038] Among them, 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 storage capacity of carbon dioxide in the effective reservoir section a of the area to be evaluated. a represents the reservoir volume of the effective reservoir section a in the area to be evaluated, Q a represents the quality evaluation of the effective reservoir segment a in the area to be evaluated, E a represents the saline water storage coefficient of the effective reservoir section a in the area to be evaluated, ρ a It represents the carbon dioxide density of the effective reservoir section a in the area to be evaluated.

[0041] The present invention also provides a system for assessing the storage capacity of carbon dioxide in a saline layer, comprising:

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

[0043] A module for obtaining favorable cap-storage combination is used to obtain several favorable saline water layer cap-storage combination in the area to be evaluated based on the drilling data and geological data of the area to be evaluated;

[0044] An effective cap layer obtaining module is used to obtain an effective cap layer for carbon dioxide storage in the area to be evaluated based on seismic data of the area to be evaluated and several favorable saline water layer storage cap reservoir combinations in the area to be evaluated;

[0045] The effective reservoir obtaining module is used to obtain the effective reservoir for carbon dioxide storage in the area to be evaluated based on the geological data of the area to be evaluated and the effective cap rock for carbon dioxide storage in the area to be evaluated;

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

[0047] The reservoir volume obtaining module is used to obtain the reservoir volume of the effective reservoir for carbon dioxide storage in the area to be evaluated according to the reservoir area, net reservoir thickness and average porosity of the effective reservoir for carbon dioxide storage in the area to be evaluated;

[0048] The quality evaluation module is used to obtain the quality evaluation of the effective reservoir for carbon dioxide storage in the area to be evaluated according to the reservoir sedimentary phase type, reservoir thickness and average permeability of the effective reservoir for carbon dioxide storage in the area to be evaluated;

[0049] The effective storage capacity assessment module is used to obtain the effective storage capacity of carbon dioxide in 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 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, comprising a processor and a memory storing a computer program, wherein the processor implements any of the above-mentioned methods for assessing the storage capacity of carbon dioxide in a saline layer when executing the computer program.

[0051] The present invention also provides a non-transitory computer-readable storage medium having a computer program stored thereon, and when the computer program is executed by a processor, the method for assessing the carbon dioxide storage capacity of a saline layer described above is implemented.

[0052] The present invention also provides a computer program product, which includes a computer program. The computer program can be stored on a non-transitory computer-readable storage medium. When the computer program is executed by a processor, the computer can execute any of the above-mentioned methods for assessing the storage capacity of carbon dioxide in saline layers.

[0053] The present invention provides a method, system, equipment and medium for assessing the storage capacity of carbon dioxide in saline layers. These methods combine drilling data, seismic data and geological data, fully consider the effectiveness and quality differences of saline layer reservoirs, and adopt a step-by-step geological evaluation method to objectively and accurately assess the geological storage capacity of carbon dioxide in different layers and overall of deep saline layers. This can provide reliable data guidance for the geological storage of carbon dioxide, effectively promote carbon neutrality and mitigate the greenhouse effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0054] In order to more clearly illustrate the technical solutions in the present invention or the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0055] Figure 1 A schematic flow chart of a method for assessing the storage capacity of carbon dioxide in a saline layer provided by the present invention.

[0056] Figure 2 Schematic diagram showing the variation of carbon dioxide density with temperature and pressure.

[0057] Figure 3 A schematic structural diagram of a saline layer carbon dioxide storage capacity assessment system provided by the present invention.

[0058] Figure 4This is a schematic structural diagram of an electronic device provided by the present invention. DETAILED DESCRIPTION

[0059] In order to make the purpose, technical solution and advantages of the present invention clearer, the technical solution of the present invention will be clearly and completely described below in conjunction with the drawings in the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments, and they should not be understood as limitations on the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention. In the description of the present invention, it should be understood that the terms used are only for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0060] Figure 1 A schematic diagram of a flow chart of a method for assessing carbon dioxide storage in a saline aquifer provided by the present invention. The method for assessing carbon dioxide storage in a saline aquifer provided by the present invention may be executed by any applicable terminal-side device or network-side device, such as a device for assessing carbon dioxide storage in a saline aquifer.

[0061] See also Figure 1 The present invention provides a method for assessing the storage capacity of carbon dioxide in a saline layer, which may include:

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

[0063] Specifically, drilling data may include drilling, logging, well testing, completion, core sampling and analysis, pre-drilling and post-drilling research data, etc. Seismic data may include two- and three-dimensional seismic exploration, interpretation and analysis research data, etc. Geological data may include stratigraphic comparison and division, structural analysis, sedimentary research data, etc.

[0064] S120. Obtain several favorable saline water layer sealing and capping reservoir combinations in the area to be evaluated based on the drilling data and geological data of the area to be evaluated.

[0065] In one embodiment, S120 may include:

[0066] Based on the drilling data 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 water layer sealing and capping reservoir combinations;

[0067] Through the first preset screening condition, several favorable saline aquifer sealing and capping reservoir combinations are screened out from several groups of saline aquifer sealing and capping reservoir combinations for the area to be evaluated.

[0068] The first preset screening condition 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 in sequence, with a total of 5 sets of saline water layer sealing and capping reservoir combinations consisting of cap layer + reservoir. Among them, the 4th set is not suitable for carbon dioxide storage due to the development of faults and poor sealing (fracture density>1 / square kilometer, fault mud distribution rate SGR<0.4), and the 5th set is too deep (reservoir top surface burial depth>3500m), so the 1st, 2nd, and 3rd sets of saline water layer sealing and capping reservoir combinations are used as favorable saline water layer sealing and capping reservoir combinations for site A.

[0069] S130. According to the seismic data of the area to be evaluated, based on several favorable saline water layer sealing and capping reservoir combinations in the area to be evaluated, an effective cap layer for carbon dioxide storage 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 caprocks of several favorable saline water layer sealing and reservoir combinations in the area to be assessed are analyzed and mapped;

[0072] The spatial distribution characteristics of the caprocks of several favorable saline layer storage and reservoir combinations in the area to be evaluated are analyzed and mapped, and the effective caprocks for carbon dioxide storage in the area to be evaluated are obtained through the second preset screening condition.

[0073] S130 can determine the distribution range of the caprock in the area where the bottom burial depth meets the supercritical temperature and pressure state of carbon dioxide and the safe storage conditions (formation temperature>31.1°C, formation pressure>7.39MPa) on the plane. In addition, the second preset screening condition can also be set according to the actual situation. For example, taking site A as an example, the spatial distribution characteristics of the caprock of the first favorable saline aquifer storage-caprock-reservoir combination were analyzed and mapped. The high part of the structure is shallowly buried (under normal formation temperature and pressure conditions, the ground temperature meets the conditions, but the high point of the bottom of the caprock is buried at a depth of less than 739 m and the corresponding pressure is less than 7.39 MPa, which does not meet the temperature and pressure conditions for supercritical carbon dioxide storage). Under the storage conditions, there is a risk of supercritical carbon dioxide plume migrating to the high part and causing phase change. The caprock of the second favorable saline aquifer storage-caprock-reservoir combination does not have this problem, and is stably distributed in the region, completely covering site A, and is shallower than the third caprock. Therefore, the caprock of the second favorable saline aquifer storage-caprock-reservoir combination is defined as the effective caprock for carbon dioxide storage at site A, and its distribution range determines the evaluation range of carbon dioxide storage at site A.

[0074] S140. Obtain an effective reservoir for carbon dioxide storage in the area to be evaluated based on the geological data of the area to be evaluated and the effective cap rock for carbon dioxide storage in the area to be evaluated.

[0075] In one embodiment, S140 may include:

[0076] Based on the effective cap rock for carbon dioxide storage in the area to be assessed, the effective reservoir for carbon dioxide storage in the area to be assessed that is located below the effective cap rock for carbon dioxide storage in the vertical direction and within the effective cap rock for carbon dioxide storage in the horizontal direction is obtained, and the effective reservoir for carbon dioxide storage is divided into a number of effective reservoir sections in the vertical direction.

[0077] Taking site A as an example, the second and third sets of favorable saline layer storage cap-reservoir combinations, in addition to their main cap and reservoir, also contain some secondary cap layers composed of mudstone interlayers, and multiple reservoir sections separated by interlayers. These reservoirs can be analyzed for their plane distribution in a larger range (not limited to site A) in combination with geological data. If the distribution range of a certain set of reservoirs with high burial depth (CO2 migration pointing area) in the region (not limited to site A) exceeds the effective cap layer for CO2 storage in site A, it is considered that the reservoir has a storage safety risk and is an invalid reservoir section, and the rest are effective reservoirs.

[0078] S150. Obtain the reservoir sedimentary phase type, reservoir area, reservoir net thickness, average permeability, average porosity, carbon dioxide density, and saline water layer storage coefficient of the effective reservoir for carbon dioxide storage in the area to be evaluated based on the drilling data, seismic data, and geological data of the area to be evaluated.

[0079] In one embodiment, S150 can obtain the reservoir sedimentary phase type (such as delta, meandering river, shallow lake phase, etc.), reservoir area, net reservoir thickness, average permeability, average porosity, carbon dioxide density, and saline water storage coefficient of several effective reservoir sections in the area to be evaluated based on the drilling data, seismic data, and geological data of the area to be evaluated.

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

[0081] In one embodiment, S160 may include:

[0082] According to the reservoir area, net reservoir thickness and average porosity of several effective reservoir sections in the area to be evaluated, the reservoir volume of several effective reservoir sections in the area to be evaluated is obtained by the first expression, wherein the first expression is:

[0083]

[0084] In the first expression, V a Represents the reservoir volume of the effective reservoir section a in the area to be evaluated, m3, A a Represents the reservoir area of ​​the effective reservoir section a in the area to be evaluated, m2, Ha Represents the net reservoir thickness of the effective reservoir section a in the area to be evaluated, m, Represents the average porosity of the effective reservoir section a in the area to be evaluated, %.

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

[0086] In addition, the reservoir can be interpreted in detail through seismic data and the relevant reservoir volume can be obtained through software.

[0087] S170. Obtain a quality evaluation of the effective carbon dioxide storage reservoir in the area to be evaluated based on the reservoir sedimentary phase type, reservoir thickness, and average permeability of the effective carbon dioxide storage reservoir in the area to be evaluated.

[0088] In one embodiment, S170 may include:

[0089] According to the reservoir sedimentary facies type, reservoir thickness and average permeability of several effective reservoir sections 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 sections in the area to be evaluated are obtained through the preset scoring coefficient table, wherein, referring to Table 1-3, the preset scoring table includes a reservoir sedimentary background scoring coefficient table, a reservoir thickness scoring coefficient table and an average permeability scoring coefficient table;

[0090] Table 1 Reservoir sedimentary background scoring coefficient table

[0091]

[0092] Table 2 Effective reservoir thickness scoring coefficient table

[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 Effective reservoir permeability scoring coefficient table

[0095]

[0096] According to the reservoir sedimentary background scoring coefficient, reservoir thickness scoring coefficient and average permeability scoring coefficient of several effective reservoir sections in the area to be evaluated, the quality evaluation of several effective reservoir sections in the area to be evaluated is obtained through the second expression, wherein the second expression is:

[0097] Q a =C1 a C2 a C3 a ,

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

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

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

[0101] Q a =0.7×0.6×0.6, and we get Q a It is 0.252.

[0102] Q b =0.95×0.8×0.8, and we get Q b It is 0.608.

[0103] Q c =1×0.8×1, and we get Q c is 0.8.

[0104] S180. Obtain the effective storage capacity of carbon dioxide in 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 layer storage coefficient of the effective carbon dioxide storage reservoir in the area to be evaluated.

[0105] In one embodiment, S180 may include:

[0106] According to the reservoir volume, quality evaluation, average porosity, carbon dioxide density, and saline layer storage coefficient of several effective reservoir sections in the area to be evaluated, the effective carbon dioxide storage capacity of several effective reservoir sections in the area to be evaluated is obtained through a third expression;

[0107] The effective storage capacity of carbon dioxide in several effective reservoir sections in the area to be evaluated is integrated to obtain the effective storage capacity of carbon dioxide in the effective carbon dioxide storage reservoir in the area to be evaluated through the fourth expression;

[0108] Among them, the third expression is:

[0109] G a =V a Q a ·E a ·ρ a ,

[0110] In the third expression, G a represents the effective storage capacity of carbon dioxide in the effective reservoir section a of the area to be evaluated, kg, V a Represents the reservoir volume of the effective reservoir section a in the area to be evaluated, m 3 , Q a represents the quality evaluation of the effective reservoir segment a in the area to be evaluated, E a represents the saline water storage coefficient of the effective reservoir section a in the area to be evaluated, ρ a represents the carbon dioxide density of the effective reservoir section a in the area to be evaluated, kg / m 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 storage capacity of CO2 in the effective CO2 storage reservoirs in the area to be evaluated, that is, the effective storage capacity of CO2 in all effective reservoir sections in the area to be evaluated. a , G b , G c It represents the effective storage capacity of carbon dioxide in 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 E obtained by numerical simulation of similar geological conditions isa =0.02, the carbon dioxide density ρ obtained according to the temperature and pressure conditions corresponding to the reservoir burial depth a =600kg / m 3 ( Figure 2 ), Quality Evaluation Q a =0.252, and the effective carbon dioxide storage capacity G is obtained by using the third expression a 5.67×10 8 Kilograms. Using the same method, the effective storage capacity of carbon dioxide in effective reservoir sections b and c can be obtained respectively: b , G c , for G a , G b , G c The sum is the effective storage capacity of carbon dioxide in the effective carbon dioxide storage reservoir of site A.

[0115] The present invention provides a method, system, equipment and medium for assessing the storage capacity of carbon dioxide in saline layers. These methods combine drilling data, seismic data and geological data, fully consider the effectiveness and quality differences of saline layer reservoirs, and adopt a step-by-step geological evaluation method to objectively and accurately assess the geological storage capacity of carbon dioxide in different layers and overall of deep saline layers. This can provide reliable data guidance for the geological storage of carbon dioxide, effectively promote carbon neutrality and mitigate the greenhouse effect.

[0116] The following is a description of the system for assessing the storage capacity of carbon dioxide in a saline aquifer provided by the present invention. The system for assessing the storage capacity of carbon dioxide in a saline aquifer described below and the method for assessing the storage capacity of carbon dioxide in a saline aquifer described above can be referred to in correspondence with each other.

[0117] See also Figure 3 The present invention provides a system for assessing the storage capacity of carbon dioxide in a saline layer, which may include:

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

[0119] A module for obtaining favorable cap-storage combination is used to obtain several favorable saline water layer cap-storage combination in the area to be evaluated based on the drilling data and geological data of the area to be evaluated;

[0120] An effective cap layer obtaining module is used to obtain an effective cap layer for carbon dioxide storage in the area to be evaluated based on seismic data of the area to be evaluated and several favorable saline water layer storage cap reservoir combinations in the area to be evaluated;

[0121] The effective reservoir obtaining module is used to obtain the effective reservoir for carbon dioxide storage in the area to be evaluated based on the geological data of the area to be evaluated and the effective cap rock for carbon dioxide storage in the area to be evaluated;

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

[0123] The reservoir volume obtaining module is used to obtain the reservoir volume of the effective reservoir for carbon dioxide storage in the area to be evaluated according to the reservoir area, net reservoir thickness and average porosity of the effective reservoir for carbon dioxide storage in the area to be evaluated;

[0124] The quality evaluation module is used to obtain the quality evaluation of the effective reservoir for carbon dioxide storage in the area to be evaluated according to the reservoir sedimentary phase type, reservoir thickness and average permeability of the effective reservoir for carbon dioxide storage in the area to be evaluated;

[0125] The effective storage capacity assessment module is used to obtain the effective storage capacity of carbon dioxide in 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 layer storage coefficient of the effective carbon dioxide storage reservoir in the area to be assessed.

[0126] Figure 4 An example of a physical structure diagram of an electronic device is shown in FIG. Figure 4 As shown, the electronic device may include: a processor 810, a communication interface 820, a memory 830 and a communication bus 840, wherein the processor 810, the communication interface 820 and the memory 830 communicate with each other through the communication bus 840. The processor 810 may call the logic instructions in the memory 830 to perform the following steps:

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

[0128] According to the drilling data and geological data of the area to be evaluated, several favorable saline water layer sealing and capping reservoir combinations in the area to be evaluated are obtained;

[0129] According to the seismic data of the area to be assessed, based on several favorable saline water layer storage and cap reservoir combinations in the area to be assessed, the effective cap rock for carbon dioxide storage in the area to be assessed is obtained;

[0130] According to the geological data of the area to be assessed, based on the effective cap rock for carbon dioxide storage in the area to be assessed, an effective reservoir for carbon dioxide storage in the area to be assessed is obtained;

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

[0132] Obtaining the reservoir volume of the effective reservoir for carbon dioxide storage in the area to be assessed based on the reservoir area, net reservoir thickness and average porosity of the effective reservoir for carbon dioxide storage in the area to be assessed;

[0133] According to the reservoir sedimentary facies type, reservoir thickness and average permeability of the effective reservoir for carbon dioxide storage in the area to be evaluated, the quality evaluation of the effective reservoir for carbon dioxide storage in the area to be evaluated is obtained;

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

[0135] In addition, the logic instructions in the above-mentioned memory 830 can be implemented in the form of a software functional unit and can be stored in a computer-readable storage medium when it is sold or used as an independent product. Based on such an understanding, the technical solution of the present invention, in essence, or the part that contributes to the prior art or the part of the technical solution, can be embodied in the form of a software product, and the computer software product is stored in a storage medium, including a number of instructions for a computer device (which can be a personal computer, a server, or a network device, etc.) to perform all or part of the steps of the method described in each embodiment of the present invention. The aforementioned storage medium includes: U disk, mobile hard disk, read-only memory (ROM, Read-Only Memory), random access memory (RAM, Random Access Memory), disk or optical disk and other media that can store program codes.

[0136] On the other hand, the present invention further provides a computer program product, the computer program product comprising a computer program, the computer program can be stored on a non-transitory computer readable storage medium, and when the computer program is executed by a processor, the computer can perform the following steps:

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

[0138] According to the drilling data and geological data of the area to be evaluated, several favorable saline water layer sealing and capping reservoir combinations in the area to be evaluated are obtained;

[0139] According to the seismic data of the area to be assessed, based on several favorable saline water layer storage and cap reservoir combinations in the area to be assessed, the effective cap rock for carbon dioxide storage in the area to be assessed is obtained;

[0140] According to the geological data of the area to be assessed, based on the effective cap rock for carbon dioxide storage in the area to be assessed, an effective reservoir for carbon dioxide storage in the area to be assessed is obtained;

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

[0142] Obtaining the reservoir volume of the effective reservoir for carbon dioxide storage in the area to be assessed based on the reservoir area, net reservoir thickness and average porosity of the effective reservoir for carbon dioxide storage in the area to be assessed;

[0143] According to the reservoir sedimentary facies type, reservoir thickness and average permeability of the effective reservoir for carbon dioxide storage in the area to be evaluated, the quality evaluation of the effective reservoir for carbon dioxide storage in the area to be evaluated is obtained;

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

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

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

[0147] According to the drilling data and geological data of the area to be evaluated, several favorable saline water layer sealing and capping reservoir combinations in the area to be evaluated are obtained;

[0148] According to the seismic data of the area to be assessed, based on several favorable saline water layer storage and cap reservoir combinations in the area to be assessed, the effective cap rock for carbon dioxide storage in the area to be assessed is obtained;

[0149] According to the geological data of the area to be assessed, based on the effective cap rock for carbon dioxide storage in the area to be assessed, an effective reservoir for carbon dioxide storage in the area to be assessed is obtained;

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

[0151] Obtaining the reservoir volume of the effective reservoir for carbon dioxide storage in the area to be assessed based on the reservoir area, net reservoir thickness and average porosity of the effective reservoir for carbon dioxide storage in the area to be assessed;

[0152] According to the reservoir sedimentary facies type, reservoir thickness and average permeability of the effective reservoir for carbon dioxide storage in the area to be evaluated, the quality evaluation of the effective reservoir for carbon dioxide storage in the area to be evaluated is obtained;

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

[0154] The device embodiments described above are merely illustrative, wherein the units described as separate components may or may not be physically separated, and the components displayed as units may or may not be physical units, that is, they may be located in one place, or they may be distributed on multiple network units. Some or all of the modules may be selected according to actual needs to achieve the purpose of the scheme of this embodiment. Ordinary technicians in this field can understand and implement it without paying creative labor.

[0155] Through the description of the above implementation methods, those skilled in the art can clearly understand that each implementation method can be implemented by means of software plus a necessary general hardware platform, and of course, it can also be implemented by hardware. Based on this understanding, the above technical solution is essentially or the part that contributes to the prior art can be embodied in the form of a software product, and the computer software product can be stored in a computer-readable storage medium, such as ROM / RAM, a disk, an optical disk, etc., including a number of instructions for a computer device (which can be a personal computer, a server, or a network device, etc.) to execute the methods described in each embodiment 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, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

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

2. The method for assessing carbon dioxide storage capacity in saline aquifers according to claim 1, characterized in that: According to the drilling data and geological data of the area to be evaluated, several favorable saline water layer sealing and capping reservoir combinations in the area to be evaluated are obtained, including: Based on the drilling data 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 water layer sealing and capping reservoir combinations; Through the first preset screening condition, several favorable saline aquifer sealing and capping reservoir combinations are screened out from several groups of saline aquifer sealing and capping reservoir combinations for the area to be evaluated.

3. The method for assessing the storage capacity of carbon dioxide in a saline aquifer according to claim 2, characterized in that: The method of obtaining the effective cap rock for carbon dioxide storage in the area to be evaluated based on the seismic data of the area to be evaluated and several favorable saline water layer storage and cap reservoir combinations in the area to be evaluated includes: Based on the seismic data of the area to be assessed, the spatial distribution characteristics of the caprocks of several favorable saline water layer sealing and reservoir combinations in the area to be assessed are analyzed and mapped; The spatial distribution characteristics of the caprocks of several favorable saline layer storage and reservoir combinations in the area to be evaluated are analyzed and mapped, and the effective caprocks for carbon dioxide storage in the area to be evaluated are obtained through the second preset screening condition.

4. The method for assessing the storage capacity of carbon dioxide in a saline aquifer according to claim 3, characterized in that: The method of obtaining an effective reservoir for carbon dioxide storage in the area to be evaluated based on the geological data of the area to be evaluated and the effective cap rock for carbon dioxide storage in the area to be evaluated comprises: Based on the effective carbon dioxide storage cap layer in the area to be assessed, obtain the effective carbon dioxide storage reservoir located below the effective carbon dioxide storage cap layer in the vertical direction and within the effective carbon dioxide storage cap layer in the horizontal direction in the area to be assessed, and divide the effective carbon dioxide storage reservoir into a plurality of effective reservoir sections in the vertical direction; and The reservoir sedimentary facies type, reservoir area, reservoir net thickness, average permeability, average porosity, carbon dioxide density, and saline water layer storage coefficient of the effective reservoir for carbon dioxide storage in the area to be evaluated are obtained based on the drilling data, seismic data, and geological data of the area to be evaluated, including: Based on the drilling data, seismic data and geological data of the area to be evaluated, the reservoir sedimentary phase type, reservoir area, reservoir net thickness, average permeability, average porosity, carbon dioxide density and saline water storage coefficient of several effective reservoir sections in the area to be evaluated are obtained.

5. The method for assessing the storage capacity of carbon dioxide in a saline aquifer according to claim 4, characterized in that: The reservoir volume of the effective carbon dioxide storage reservoir in the area to be assessed 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 assessed, including: According to the reservoir area, net reservoir thickness and average porosity of several effective reservoir sections in the area to be evaluated, the reservoir volume of several effective reservoir sections in the area to be evaluated is obtained by the first expression, wherein the first expression is: In the first expression, V a A represents the reservoir volume of the effective reservoir section a in the area to be evaluated. a represents the reservoir area of ​​the effective reservoir section a in the area to be evaluated, H a represents the net reservoir thickness of the effective reservoir section a in the area to be evaluated, It represents the average porosity of the effective reservoir section a in the area to be evaluated.

6. The method for assessing the storage capacity of carbon dioxide in a saline aquifer according to claim 5, characterized in that: The quality evaluation of the effective carbon dioxide storage reservoir in the area to be evaluated is obtained based on the reservoir sedimentary phase type, reservoir thickness and average permeability of the effective carbon dioxide storage reservoir in the area to be evaluated, including: According to the reservoir sedimentary facies type, reservoir thickness and average permeability of several effective reservoir sections in the area to be evaluated, reservoir sedimentary background scoring coefficients, reservoir thickness scoring coefficients and average permeability scoring coefficients of several effective reservoir sections in the area to be evaluated are obtained; According to the reservoir sedimentary background scoring coefficient, reservoir thickness scoring coefficient and average permeability scoring coefficient of several effective reservoir sections in the area to be evaluated, the quality evaluation of several effective reservoir sections in the area to be evaluated is obtained through the second expression, wherein the second expression is: Q a =C1 a ·C2 a ·C3 a , In the second expression, Q a represents the quality evaluation of the effective reservoir segment a in the area to be evaluated, C1 a Reservoir sedimentary background scoring coefficient of the effective reservoir section a in the area to be evaluated, C2 a Represents the reservoir thickness scoring coefficient of the effective reservoir section a in the area to be evaluated, C3 a It represents the average permeability scoring coefficient of the effective reservoir section a in the area to be evaluated.

7. The method for assessing the storage capacity of carbon dioxide in a saline aquifer according to claim 6, characterized in that: The effective storage capacity of carbon dioxide in the effective carbon dioxide storage reservoir in the area to be evaluated is obtained according to 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 evaluated, including: According to the reservoir volume, quality evaluation, average porosity, carbon dioxide density, and saline layer storage coefficient of several effective reservoir sections in the area to be evaluated, the effective carbon dioxide storage capacity of several effective reservoir sections in the area to be evaluated is obtained through a third expression; The effective storage capacity of carbon dioxide in the effective reservoirs of carbon dioxide storage in the area to be evaluated is obtained by integrating the effective storage capacity of carbon dioxide in several effective reservoir sections in the area to be evaluated; Among them, the third expression is: G a =V a ·Q a ·E a ·r a , In the third expression, G a V represents the effective storage capacity of carbon dioxide in the effective reservoir section a of the area to be evaluated. a represents the reservoir volume of the effective reservoir section a in the area to be evaluated, Q a represents the quality evaluation of the effective reservoir segment a in the area to be evaluated, E a represents the saline water storage coefficient of the effective reservoir section a in the area to be evaluated, ρ a It represents the carbon dioxide density of the effective reservoir section a in the area to be evaluated.

8. A system for assessing the storage capacity of carbon dioxide in saline aquifers, characterized in that: include: The data acquisition module is used to obtain drilling data, seismic data, and geological data of the area to be evaluated; A module for obtaining favorable capping and reservoir combinations is used to obtain several favorable saline water layer capping and reservoir combinations in the area to be evaluated based on drilling data and geological data of the area to be evaluated; An effective cap layer obtaining module is used to obtain an effective cap layer for carbon dioxide storage in the area to be evaluated based on seismic data of the area to be evaluated and several favorable saline water layer storage cap reservoir combinations in the area to be evaluated; The effective reservoir obtaining module is used to obtain the effective reservoir for carbon dioxide storage in the area to be evaluated based on the geological data of the area to be evaluated and the effective cap rock for carbon dioxide storage in the area to be evaluated; The data processing module is used to obtain the reservoir sedimentary phase type, reservoir area, reservoir net thickness, average permeability, average porosity, carbon dioxide density, and saline water layer storage coefficient of the effective reservoir for carbon dioxide storage in the area to be evaluated based on the drilling data, seismic data, and geological data of the area to be evaluated; The reservoir volume obtaining module is used to obtain the reservoir volume of the effective reservoir for carbon dioxide storage in the area to be evaluated according to the reservoir area, net reservoir thickness and average porosity of the effective reservoir for carbon dioxide storage 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 phase type, reservoir thickness and average permeability of the effective carbon dioxide storage reservoir in the area to be evaluated; 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 layer storage coefficient of the effective carbon dioxide storage reservoir in the area to be evaluated.

9. An electronic device comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein: When the processor executes the program, the method for assessing the carbon dioxide storage capacity of a saline layer as described in any one of claims 1 to 7 is implemented.

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

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