An experimental method for characterizing davisite enrichment conditions

Abstract

The present application relates to a kind of experimental methods for characterizing davyne enrichment conditions, which includes rock types, temperature ranges, pH value ranges, fluid types of davyne enrichment characterization, by carrying out a series of water-rock simulation experiments under the same experimental conditions on davyne samples, and using the corresponding davyne dissolution strength and stability of each water-rock simulation experiment, the relationship between davyne enrichment and environmental conditions such as rock types, temperature ranges, pH value ranges and fluid types is characterized.The present application also relates to a high-temperature and high-pressure reaction kettle device for the experimental method.The present application is an experimental method for characterizing davyne enrichment conditions, which obtains the environmental conditions for the stable existence of natural davyne by characterizing davyne enrichment conditions in rock types, temperature, pH value and fluid types, and further determines the high-quality site for CO2 geological storage.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of evaluation of davyne enrichment conditions in rocks, and particularly relates to an experimental method for characterizing davyne enrichment conditions. BACKGROUND

[0002] Recent studies have shown that global warming since the industrial revolution is mainly the result of the accumulation of CO2 produced by human activities in the atmosphere. With the gradual warming of the earth's surface, potential and even catastrophic global climate change can be caused. In view of the fact that CO2 is the main component of greenhouse gases, many suggestions have been made in recent years to limit the concentration of CO2 in the atmosphere, and CO2 geological storage is one of them. CO2 geological storage is to inject industrial emissions of CO2 into underground salt water layers, depleted oil and gas reservoirs and coal seams, and the main types of storage rocks involved are sandstone, carbonate rock, volcanic rock, volcanic clastic rock and coal rock, which is the most promising way of CO2 storage. After CO2 is injected into the underground, it can be stored by structural traps, hydrodynamic traps, dissolution traps and mineral traps. Among them, the mineral trapping of CO2 is a geochemical process in which CO2 dissolves in water (or brine) and reacts with other minerals or ions to form carbonate minerals. The study of natural CO2 reservoir petrology and geochemical simulation for the purpose of CO2 geological storage shows that the carbonate minerals formed by the dissolution-precipitation reaction of natural and artificially injected CO2 in the formation are mainly calcite, davyne, ankerite, siderite and magnesite, etc. Among them, davyne is an easily identifiable authigenic carbonate mineral formed by the "capture" of CO2, and is considered to be a characteristic mineral for recording the migration, accumulation and dispersion of CO2. Compared with hydrodynamic trapping and dissolution trapping, mineral trapping of CO2 can achieve long-term and safe storage of injected CO2, and different types of rocks can affect the total CO2 capture amount, but do not affect the fact that the main carbon fixation mineral is davyne. The carbon capture amount of davyne in the storage rock can account for 42.2%-90.1% of the total carbon fixation amount. Therefore, under comparable geological conditions, the ability of mineral trapping CO2 naturally becomes one of the important factors for finding CO2 geological storage sites. The geological background of davyne enrichment is the best geological condition for CO2 geological storage, and the condition for the large and stable existence of natural davyne will be the key problem restricting CO2 mineral storage and an important influencing factor for finding CO2 geological storage sites. SUMMARY

[0003] The technical problem to be solved by the present application is to provide an experimental method for characterizing davyne enrichment conditions, which can obtain the environmental conditions for the large and stable existence of natural davyne by characterizing the davyne enrichment conditions in rock types, temperature, pH value and fluid types, and further determine the high-quality CO2 geological storage site.

[0004] The experimental method for characterizing the dawsonite enrichment conditions comprises the following steps,

[0005] S1-Characterizing the rock type of dawsonite enrichment: taking different reservoir rocks and different structures of the same reservoir rock, respectively, in a high-temperature and high-pressure reaction kettle device, the same water-rock simulation experiment under the same experimental conditions is carried out, according to the Na + and Al 3+ ion precipitation data during the dissolution process of each, the ion precipitation capacity of different types of reservoir rocks is determined, and the rock type of dawsonite enrichment is characterized;

[0006] S2-Characterizing the temperature range of dawsonite enrichment: taking natural or artificially synthesized dawsonite samples, referring to the pH value and the nature of the formation water of the dawsonite development layer, the same water-rock simulation experiment under the same experimental conditions except temperature is carried out in a high-temperature and high-pressure reaction kettle device, according to the strength and stability of dawsonite dissolution under the same pH value and different temperatures, the temperature interval for the stable existence of dawsonite is characterized;

[0007] S3-Characterizing the pH value range of dawsonite enrichment: taking natural or artificially synthesized dawsonite samples, referring to the temperature and the nature of the formation water of the dawsonite development layer, the same water-rock simulation experiment under the same experimental conditions except pH value is carried out in a high-temperature and high-pressure reaction kettle device, according to the strength and stability of dawsonite dissolution under the same temperature and different pH values, the pH value range for the stable existence of dawsonite is characterized;

[0008] S4-Characterizing the fluid type of dawsonite enrichment: taking different types of formation water and natural or artificially synthesized dawsonite samples, the same water-rock simulation experiment under the same experimental conditions is carried out in a high-temperature and high-pressure reaction kettle device, according to the strength and stability of dawsonite dissolution under the same temperature and pH value and different types of formation water, the fluid type for the stable existence of dawsonite is characterized.

[0009] Specific to the water-rock simulation experiment equipment, the high-temperature and high-pressure reaction kettle device comprises a reaction kettle system, a gas cylinder, a gas booster pump, a piston container and a sampler. It is used to realize the water-rock simulation reaction under the simulated geological conditions in each characterization experiment.

[0010] Further, the reaction kettle system comprises a hastelloy reaction kettle and a muffle furnace, the hastelloy reaction kettle is arranged in the muffle furnace, a polytetrafluoroethylene liner and a magnetic stirring device are arranged in the hastelloy reaction kettle, the gas cylinder is connected with the hastelloy reaction kettle through a gas pipeline, a gas booster pump and a valve, and the piston container is connected with the hastelloy reaction kettle through a liquid pipeline and a valve. The volume of the reaction kettle is 1L, various substances can be used for chemical reaction in a high-temperature and high-pressure range of 40MPa and 350℃, and the working temperature can be adjusted by the temperature controller in the reaction kettle system according to experimental requirements; the kettle body is made of hastelloy material and has strong corrosion resistance; the device has the functions of presetting the temperature and pressure in the reaction kettle and protecting the temperature and pressure overload, and the electromagnetic driving stirring paddle arranged in the reaction kettle can stir the reactants during the reaction, thereby accelerating the reaction speed.

[0011] The rock type characterization of the dawsonite enrichment in step 2 of the experimental method for characterizing the dawsonite enrichment conditions is as follows: based on the existing data of the interaction between the reservoir rock and the CO2 fluid, the water-rock simulation experimental data under comparable conditions are supplemented and collected, the experimental data of the reconstruction of the detrital feldspar sandstone by the CO2 fluid under the conditions of 100, 200 and 300℃ are obtained, the water-rock simulation experimental data of the detrital sandstone, quartz sandstone and other types of reservoir rocks under the same experimental conditions are supplemented, the dissolution characteristics of various rock types are compared, the dissolution characteristics of the same type of reservoir rock (such as feldspar sandstone) with different structures (such as coarse-grained, medium-grained and fine-grained) under the same experimental conditions are compared, and the ion precipitation capacity of different types of reservoir rocks is determined according to the measured Na + and Al 3+ ion data, and the rock types of the dawsonite enrichment are characterized.

[0012] The water-rock simulation experiment for characterizing the temperature range of the dawsonite enrichment in step 2 of the experimental method for characterizing the dawsonite enrichment conditions is as follows: the sample to be tested and 500ml of distilled water are placed in the basket of the hastelloy reaction kettle, the CO2 gas in the gas cylinder is injected into the reaction kettle at a certain flow rate and flow by using a gas booster pump, and the pressure in the kettle is ensured to be greater than 7.2MPa (when the temperature is greater than 31.26℃ and the pressure is greater than 7.2Mpa, the CO2 reaches a supercritical state, and the CO2 is in a supercritical state during the geological storage process, so the experimental pressure is greater than 7.2MPa), then the reaction is carried out at 80℃, 100℃, 120℃, 140℃, 160℃, 180℃ and 200℃ for 72h respectively, after natural cooling, the sample is taken out at room temperature, liquid-solid separation is carried out, the generated solid phase material is filtered and repeatedly washed with distilled water, dried at 60℃ for 24h, and scanning electron microscopy and X-ray diffraction analysis are carried out to characterize the strength of the dawsonite dissolution at different temperatures; the filtrate is subjected to systematic chemical analysis, and the analysis items include pH value, salinity and Na+ , Al 3+ , HCO3 - , CO3 2- content (mg / L), which represents the stability of dawsonite at different temperatures.

[0013] The water-rock simulation experiment for representing the pH value range of dawsonite enrichment in step 3 of the experimental method for representing the dawsonite enrichment condition comprises the following steps: solutions with pH values of 5, 6, 7, 8, 9 and 10 are placed in a polytetrafluoroethylene inner container of a Hass alloy reaction kettle with a volume of 300 ml, the dawsonite sample to be tested is placed in the reaction kettle, and finally the reaction kettle is placed in a muffle furnace for heat preservation at temperatures of 80 DEG C and 100 DEG C for 72 h. After natural cooling, it is taken out at room temperature, liquid-solid separation is performed, the generated solid phase material is filtered and repeatedly washed with distilled water, dried at 60 DEG C for 24 h, and scanning electron microscopy and X-ray diffraction analysis are performed to represent the strength of the dawsonite dissolution at different pH values. Systematic chemical analysis is performed on the filtrate, and the analysis items include pH value, salinity and Na + , Al 3+ , HCO3 - , CO3 2- content (mg / L), which represents the stability of dawsonite at different pH values.

[0014] The water-rock simulation experiment for representing the fluid type of dawsonite enrichment in step 4 of the experimental method for representing the dawsonite enrichment condition comprises the following steps,

[0015] S41-Representing the formation water type of dawsonite enrichment: different types of formation water are placed in a polytetrafluoroethylene inner container of a Hass alloy reaction kettle with a volume of 300 ml, the dawsonite sample is placed in the reaction kettle, the reaction kettle is placed in a muffle furnace, and heat preservation is performed at temperatures of 80 DEG C and 100 DEG C for 72 h. After natural cooling, it is taken out at room temperature, liquid-solid separation is performed, the generated solid phase material is filtered and repeatedly washed with distilled water, dried at 60 DEG C for 24 h, and scanning electron microscopy and X-ray diffraction analysis are performed to represent the strength of the dawsonite dissolution under different formation water. Systematic chemical analysis is performed on the filtrate, and the analysis items include pH value, salinity and Na + , Al 3+ , HCO3 - , CO3 2- content (mg / L), which represents the stability of dawsonite at different formation water;

[0016] S42-Representing the oil and gas charging condition of dawsonite enrichment, which comprises the representation of oil-free reservoir and the representation of oil-bearing reservoir, and specifically comprises the following steps,

[0017] S421 - Characterization of oil-free reservoir: Al(OH)3 precipitate was prepared by reacting 2 mol / L AlCl3·6H2O solution and 28% NH3·H2O, and the precipitate was repeatedly washed with distilled water until NH4+ could not be detected (10 ml of filtrate was heated, and litmus paper did not turn blue); then, according to the ratio of 16:1, a certain amount of NaHCO3 was added to the Al(OH)3 suspension and stirred uniformly, and the pH value of the system was adjusted to 9, 9.5, and 10 respectively with NaOH; finally, the reaction solutions with different pH values were respectively put into the polytetrafluoroethylene inner container with a volume of 300 ml (filling degree of 65%) of the Hastelloy reactor, and the reactor was placed in a muffle furnace, and reacted at 100°C, 120°C and 140°C respectively for 12h and 24h; after the hydrothermal reaction was completed, it was naturally cooled, taken out at room temperature, liquid-solid separation was carried out, the generated solid phase material was filtered and repeatedly washed with distilled water, and dried at 60°C for 24h, X-ray diffraction and scanning electron microscope analysis were carried out; through phase analysis and particle size determination of the reaction product, the best experimental conditions for artificially synthesizing davyne were obtained, and single-phase, complete crystal shape and good uniformity davyne were obtained; +

[0018] S421 - Characterization of oil-free reservoir: Al(OH)3 precipitate was prepared by reacting 2 mol / L AlCl3·6H2O solution and 28% NH3·H2O, and the precipitate was repeatedly washed with distilled water until NH4+ could not be detected (10 ml of filtrate was heated, and litmus paper did not turn blue); then, according to the ratio of 16:1, a certain amount of NaHCO3 was added to the Al(OH)3 suspension and stirred uniformly, and the pH value of the system was adjusted to 9, 9.5, and 10 respectively with NaOH; finally, the reaction solutions with different pH values were respectively put into the polytetrafluoroethylene inner container with a volume of 300 ml (filling degree of 65%) of the Hastelloy reactor, and the reactor was placed in a muffle furnace, and reacted at 100°C, 120°C and 140°C respectively for 12h and 24h; after the hydrothermal reaction was completed, it was naturally cooled, taken out at room temperature, liquid-solid separation was carried out, the generated solid phase material was filtered and repeatedly washed with distilled water, and dried at 60°C for 24h, X-ray diffraction and scanning electron microscope analysis were carried out; through phase analysis and particle size determination of the reaction product, the best experimental conditions for artificially synthesizing davyne were obtained, and single-phase, complete crystal shape and good uniformity davyne were obtained; +

[0019] ​​S423-Characterization of oil and gas charging conditions of sapphirine enrichment: X-ray diffraction and scanning electron microscopy analysis of the solid phase materials generated by the two groups of reactions, through the comprehensive comparison of the quality, composition and morphology characteristics of the solid phase materials, and combined with the results of natural analogy, the influence of oil and gas charging on the formation of sapphirine is characterized. The present application is an experimental method for characterizing the sapphirine enrichment conditions, which obtains the environmental conditions for the large and stable existence of natural sapphirine by characterizing the sapphirine enrichment conditions in rock type, temperature, pH value and fluid type, and further determines the high-quality site of CO2 geological storage. BRIEF DESCRIPTION OF DRAWINGS

[0020] The experimental method for characterizing the sapphirine enrichment conditions of the present application will be further described below in conjunction with the drawings:

[0021] Figure 1 is a flow chart of the experimental method for characterizing the sapphirine enrichment conditions of the present application;

[0022] Figure 2 is a schematic diagram of the planar structure of the high-temperature and high-pressure reaction kettle device of the experimental method for characterizing the sapphirine enrichment conditions of the present application.

[0023] In the figure: 1-reaction kettle system, 2-gas cylinder, 3-gas booster pump, 4-piston container; 11-Hastelloy reaction kettle, 12-muffle furnace. DETAILED DESCRIPTION

[0024] In the present application, unless otherwise specified and limited, the terms "mounting", "connection", "connection", "fixing" and the like should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or it can be integrated; it can be directly connected, or it can be indirectly connected through an intermediate medium; it can be the internal communication of two elements or the interaction relationship of two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0025] In the description of the present application, it should be understood that the terms "left", "right", "front", "back", "top", "bottom", "inside", "outside" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, therefore it cannot be understood as a limitation on the present application.

[0026] The technical solutions of the present application will be further described below with specific examples, but the protection scope of the present application is not limited to the following examples.

[0027] Embodiment 1: as Figure 1As shown, the experimental method for characterizing the dawsonite enrichment conditions includes the following steps,

[0028] S1-Characterizing the rock type of dawsonite enrichment: Take different reservoir rocks and different structures of the same type of reservoir rock, and perform water-rock simulation experiments under the same experimental conditions in a high-temperature and high-pressure reaction kettle device. According to the Na + and Al 3+ ion precipitation data during the dissolution process of each rock type, determine the ion precipitation capacity of different types of reservoir rocks, and further characterize the rock type of dawsonite enrichment. Specifically, based on the existing experimental data of reservoir rock-CO2 fluid interaction, supplement the water-rock simulation experimental data under comparable conditions, and obtain the experimental data of the transformation of detrital feldspar sandstone by CO2 fluid under the conditions of 100, 200, and 300°C. Under the same experimental conditions, supplement the water-rock simulation experimental data of detrital sandstone, quartz sandstone, and other types of reservoir rocks. Through the dissolution characteristics of each rock type, compare the dissolution characteristics of the same type of reservoir rock (such as feldspar sandstone) with different structures (such as coarse-grained, medium-grained, and fine-grained) under the same experimental conditions. According to the measured Na + and Al 3+ ion data, determine the ion precipitation capacity of different types of reservoir rocks, and characterize the rock type of dawsonite enrichment.

[0029] S2-Characterizing the temperature range of dawsonite enrichment: Take natural or artificially synthesized dawsonite samples, refer to the pH value of the dawsonite development layer and the properties of the formation water, and perform water-rock simulation experiments in a high-temperature and high-pressure reaction kettle device under the same experimental conditions except for temperature. According to the strength and stability of dawsonite dissolution under the same pH value and different temperatures, characterize the temperature range in which dawsonite stably exists. Specifically, place the dawsonite sample to be tested and 500 ml of distilled water into the hanging basket of the Hastelloy reaction kettle 11. Inject CO2 gas from the gas cylinder into the reaction kettle at a certain flow rate and flow rate, and ensure that the pressure in the kettle is >7.2 MPa (when the temperature is >31.26°C and the pressure is >7.2 MPa, CO2 reaches a supercritical state, and CO2 is in a supercritical state during geological storage. Therefore, the experimental pressure is above 7.2 MPa). Then react at 80°C, 100°C, 120°C, 140°C, 160°C, 180°C, and 200°C for 72 hours, respectively. After natural cooling, take out at room temperature, perform liquid-solid separation, filter the generated solid phase material, and repeatedly rinse with distilled water. Dry at 60°C for 24 hours, and perform scanning electron microscopy and X-ray diffraction analysis to characterize the strength of dawsonite dissolution under different temperatures. Perform systematic chemical analysis on the filtrate, and the analysis items include pH value, salinity, Na + , Al 3+ , HCO3 - , CO3 2-Concentration (mg / L) of Na, Al, HCO3, CO3, representing the stability of bayerite at different temperatures.

[0030] S3-Characterization of the pH range of bayerite enrichment: Take natural or artificially synthesized bayerite samples, refer to the temperature and formation water properties of the bayerite development horizon, and conduct water-rock simulation experiments under the same experimental conditions except for pH in a high-temperature and high-pressure reaction kettle device. According to the dissolution strength and stability of bayerite at the same temperature and different pH values, the pH range in which bayerite is stably present is characterized. Specifically, solutions with pH values of 5, 6, 7, 8, 9, and 10 are placed in the polytetrafluoroethylene inner container of the Hastelloy reaction kettle 11 with a volume of 300 ml. The bayerite sample to be tested is placed in the reaction kettle, and finally the reaction kettle is placed in a muffle furnace. The temperature is 80℃ and 100℃, and the temperature is kept for 72h. After natural cooling, it is taken out at room temperature, liquid-solid separation is performed, the generated solid phase material is filtered and repeatedly washed with distilled water, dried at 60℃ for 24h, and scanning electron microscopy and X-ray diffraction analysis are performed to characterize the dissolution strength of bayerite at different pH values. The filtrate is subjected to systematic chemical analysis, and the analysis items include pH, salinity, and Na + , Al 3+ , HCO3 - , CO3 2- concentration (mg / L), representing the stability of bayerite at different pH values.

[0031] S4-Characterization of the fluid type of bayerite enrichment: Take different types of formation water and natural or artificially synthesized bayerite samples, and conduct water-rock simulation experiments under the same experimental conditions in a high-temperature and high-pressure reaction kettle device. According to the dissolution strength and stability of bayerite at the same temperature and pH value and different formation water types, the fluid type in which bayerite is stably present is characterized. Specifically, the following steps are included,

[0032] S41-Characterization of the formation water type of bayerite enrichment: Different types of formation water are placed in the polytetrafluoroethylene inner container of the Hastelloy reaction kettle 11 with a volume of 300 ml. The bayerite sample is placed in the reaction kettle, and the reaction kettle is placed in a muffle furnace 12. The temperature is kept at 80℃ and 100℃ for 72h. After natural cooling, it is taken out at room temperature, liquid-solid separation is performed, the generated solid phase material is filtered and repeatedly washed with distilled water, dried at 60℃ for 24h, and scanning electron microscopy and X-ray diffraction analysis are performed to characterize the dissolution strength of bayerite under different formation water. The filtrate is subjected to systematic chemical analysis, and the analysis items include pH, salinity, and Na + , Al 3+ , HCO3 - , CO3 2- concentration (mg / L), representing the stability of bayerite under different formation water;

[0033] S42 – Characterizing hydrocarbon charging conditions enriched in sialic acid ore includes characterizing both oil-free and oil-bearing reservoirs, specifically comprising the following steps:

[0034] Characterization of S421-oil-free reservoir: Al(OH)3 precipitate was prepared by reacting 2 mol / L AlCl3·6H2O solution with 28% NH3·H2O, and the precipitate was repeatedly washed with distilled water until NH4+ was undetectable. + The reaction was carried out until (10 ml of the filtrate was heated, and litmus paper did not turn blue); then, a certain amount of NaHCO3 was added to the Al(OH)3 suspension at a ratio of 16:1 and stirred evenly, and the pH value of the system was adjusted to 9, 9.5, and 10 with NaOH respectively; finally, the reaction solutions with different pH values ​​were placed into 300 ml polytetrafluoroethylene liners (65% filling degree) of Hastelloy reactors, and the reactors were placed in muffle furnaces and reacted at 100℃, 120℃, and 140℃ for 12 h and 24 h respectively; after the hydrothermal reaction was completed, the reactors were naturally cooled, removed at room temperature, and subjected to liquid-solid separation. The generated solid phase was filtered, repeatedly washed with distilled water, dried at 60℃ for 24 h, and analyzed by X-ray diffraction and scanning electron microscopy; through phase analysis and particle size determination of the reaction products, the optimal experimental conditions for the artificial synthesis of aluminum aluminum oxide were obtained, and aluminum aluminum oxide with single phase, complete crystal shape, and good homogeneity was obtained;

[0035] Characterization of the S422-oil-bearing reservoir: Al(OH)3 precipitate was prepared by reacting 2 mol / L AlCl3·6H2O solution with 28% NH3·H2O, and the precipitate was repeatedly washed with distilled water until NH4+ was undetectable. + Until (heat 10 ml of the filtrate; litmus paper does not turn blue); then, according to a 16:1 ratio, add to Al(OH)3 A certain amount of NaHCO3 and a certain amount of crude oil (the amount of petroleum added was adjusted according to the oil-water ratio of 1:1, 1:5, and 1:10) were added to the suspension and stirred evenly. The pH value of the system was adjusted to 9, 9.5, and 10 with NaOH, respectively. Finally, the reaction solutions with different pH values ​​were placed into 300 ml polytetrafluoroethylene liners (65% filling degree) of Hastelloy reactors, and the reactors were placed in muffle furnaces and reacted at 100℃, 120℃, and 140℃ for 12 h and 24 h, respectively. After the hydrothermal reaction was completed, the reactors were allowed to cool naturally, removed at room temperature, and subjected to liquid-solid separation. The resulting solid phase was filtered, repeatedly washed with distilled water, dried at 60℃ for 24 h, and analyzed by X-ray diffraction and scanning electron microscopy. Through phase analysis and particle size determination of the reaction products, the optimal experimental conditions for the artificial synthesis of aluminum aluminum oxide were obtained, and aluminum aluminum oxide with single phase, complete crystal shape, and good homogeneity was obtained.

[0036] Characterization of hydrocarbon charging conditions for S423-sodium aluminum oxide enrichment: X-ray diffraction and scanning electron microscopy analysis were performed on the solid phase materials generated by the two reactions. By comprehensively comparing the quality, composition and morphological characteristics of the solid phase products, and combining the results of natural analogy, the influence of hydrocarbon charging on the formation of sodium aluminum oxide was characterized.

[0037] Implementation method 2: such as Figure 2 As shown, specifically in the water-rock simulation experimental equipment, the high-temperature and high-pressure reactor device includes a reactor system 1, a gas cylinder 2, a gas booster pump 3, a piston container 4, and a sampler. It is used to simulate water-rock reactions under simulated geological conditions in various characterization experiments. The reactor system 1 includes a Hastelloy reactor 11 and a muffle furnace 12. The Hastelloy reactor 11 is equipped with a polytetrafluoroethylene liner and a magnetic stirring device. The gas cylinder 2 is connected to the Hastelloy reactor 11 via a gas pipeline, the gas booster pump 3, and a valve. The piston container 4 is connected to the Hastelloy reactor 11 via a liquid pipeline and a valve. The reactor has a volume of 1L and can accommodate chemical reactions of various substances within a high temperature and high pressure range of 40MPa and 350℃. The operating temperature can be adjusted by a temperature controller in the reactor system to regulate the muffle furnace according to experimental requirements. The reactor body is made of Hastelloy, which has extremely strong corrosion resistance. The device has preset temperature and pressure settings and overload protection functions for temperature and pressure inside the reactor. The reactor is also equipped with an electromagnetically driven stirring paddle, which can stir the reactants during the reaction process, thereby accelerating the reaction rate.

[0038] This experimental method for characterizing the enrichment conditions of galena involves characterization methods and experimental equipment design to characterize the enrichment conditions of galena in terms of rock type, temperature, pH value, and fluid type. This yields the environmental conditions for the large-scale and stable existence of natural galena, and thus identifies high-quality sites for CO2 geological burial.

[0039] The foregoing description shows only some embodiments of the application, and consequently only some combinations of features are mentioned. It will be apparent to those skilled in the art that many more embodiments can be practiced, and that features from one embodiment can be combined with features from another embodiment. As the description is only that of the preferred embodiments, it is not intended to limit the scope of the application, which is defined only by the claims.

Claims

1. An experimental method for characterizing the enrichment conditions of succinate, characterized by: The experimental method includes the following steps. S1 - Characterizing the rock type enriched with sodium aluminum oxide: Different reservoir rocks and rocks of the same type with different structures were subjected to water-rock simulation experiments under the same experimental conditions in a high-temperature and high-pressure reactor. The Na+ concentration during their respective dissolution processes was then analyzed. + And Al 3+ Ion precipitation data are used to determine the ion precipitation capacity of different types of reservoir rocks, thereby characterizing the rock types enriched with galena. S2 - Characterizing the temperature range of galvanite enrichment: Natural or synthetic galvanite samples were taken, and water-rock simulation experiments were conducted under the same experimental conditions except for temperature, taking into account the pH value and formation water properties of the galvanite development strata. Based on the strength and stability of galvanite dissolution at different temperatures and the same pH value, the temperature range in which galvanite stably exists was characterized; wherein, all water-rock simulation experiments were conducted under CO2 supercritical pressure > 7.2 MPa. S3 - Characterizing the pH range of soda ash enrichment: Natural or synthetic soda ash samples were taken, and the temperature of the soda ash development layer and the properties of the formation water were taken into account. A water-rock simulation experiment was conducted in a high-temperature and high-pressure reactor under the same experimental conditions except for pH value. Based on the strength and stability of the soda ash dissolution under the same temperature and different pH values, the pH range of stable existence of soda ash was characterized. S4 - Characterizing the fluid type enriched in galvanic acid: Different types of formation water samples and natural or synthetic galvanic acid samples were taken and subjected to a water-rock simulation experiment under the same experimental conditions in a high-temperature and high-pressure reactor. Based on the strength and stability of galvanic acid dissolution under the same temperature and pH value and different formation water types, the fluid type in which galvanic acid stably exists was characterized. Among them, the fluid type includes the characterization of oil-bearing reservoirs. The water-rock simulation experiment for the characterization of oil-bearing reservoirs was carried out under a CO2 supercritical pressure >7.2 MPa. The characterization of oil-bearing reservoirs included experimental conditions in which crude oil was added at oil-water ratios of 1:1, 1:5, and 1:

10.

2. The experimental method for characterizing the enrichment conditions of succinate according to claim 1, characterized in that: The high-temperature and high-pressure reactor device includes a reactor system (1), a gas cylinder (2), a gas booster pump (3), a piston container (4), and a sampler.

3. The experimental method for characterizing the enrichment conditions of succinate according to claim 2, characterized in that: The reactor system (1) includes a Hastelloy reactor (11) and a muffle furnace (12). The Hastelloy reactor (11) is located inside the muffle furnace (12). The Hastelloy reactor (11) is equipped with a polytetrafluoroethylene liner and a magnetic stirring device. The gas cylinder (2) is connected to the Hastelloy reactor (11) through a gas pipeline via a gas booster pump (3) and a valve. The piston container (4) is connected to the Hastelloy reactor (11) through a liquid pipeline via a valve.

4. The experimental method for characterizing the enrichment conditions of succinate according to claim 3, characterized in that: The water-rock simulation experiment describing the temperature range for enrichment of sialic acid ore in step 2 is as follows: The sialic acid ore sample to be tested and 500 ml of distilled water are placed in the basket of the Hastelloy reactor (11). CO2 gas from the gas cylinder is injected into the reactor at a certain flow rate and volume using a gas booster pump (3), and the pressure inside the reactor is ensured to be >7.2 MPa. Then, the reactor is reacted for 72 h at 80℃, 100℃, 120℃, 140℃, 160℃, 180℃ and 200℃ respectively. After natural cooling, the reactor is taken out at room temperature and liquid-solid separation is performed. The generated solid phase is filtered and repeatedly rinsed with distilled water. The sample is dried at 60℃ for 24 h. The sample is repeatedly rinsed and dried with distilled water and subjected to scanning electron microscopy and X-ray diffraction analysis to characterize the strength of sialic acid ore dissolution at different temperatures. The filtrate is subjected to systematic chemical analysis, including pH value, mineralization and Na+. + Al 3+ HCO3 - CO3 2- The content characterizes the stability of sodium galvanite at different temperatures.

5. The experimental method for characterizing the enrichment conditions of succinate according to claim 3, characterized in that: The water-rock simulation experiment describing the pH range for enrichment of sialic acid ore in step 3 specifically involves placing solutions with pH values ​​of 5, 6, 7, 8, 9, and 10 into a 300ml polytetrafluoroethylene liner of a Hastelloy reactor (11), placing the sialic acid ore sample to be tested into the reactor, and finally placing the reactor into a muffle furnace (12). The reactor is kept at 80℃ and 100℃ for 72 hours, and after natural cooling, it is removed at room temperature for liquid-solid separation. The resulting solid phase is filtered and repeatedly rinsed with distilled water, then dried at 60℃ for 24 hours. The sample is then subjected to scanning electron microscopy and X-ray diffraction analysis to characterize the intensity of sialic acid ore dissolution at different pH values. The filtrate undergoes systematic chemical analysis, including pH value, mineralization, and Na+. + Al 3+ HCO3 - CO3 2- The content characterizes the stability of sodium aluminum oxide at different pH values.

6. The experimental method for characterizing the enrichment conditions of galvanite according to claim 3, characterized in that: the water-rock simulation experimental group for characterizing the fluid type of galvanite enrichment in step 4 includes the following steps, S41 - Characterizing the formation water type enriched in argyrope: Different types of formation water were placed in a 300ml polytetrafluoroethylene liner of a Hastelloy reactor (11), and argyrope samples were placed in the reactor. The reactor was placed in a muffle furnace (12) and kept at 80℃ and 100℃ for 72h. After natural cooling, the samples were taken out at room temperature and subjected to liquid-solid separation. The solid phase was filtered and repeatedly rinsed with distilled water. The samples were dried at 60℃ for 24h. The samples were analyzed by scanning electron microscopy and X-ray diffraction to characterize the intensity of argyrope dissolution under different formation waters. The filtrate was subjected to systematic chemical analysis, including pH value, mineralization and Na+. + Al 3+ HCO3 - CO3 2- Content, characterizing the stability of underwater diatomite in different strata; S42 – Characterizing hydrocarbon charging conditions enriched in sialic acid ore includes characterizing both oil-free and oil-bearing reservoirs, specifically comprising the following steps: Characterization of S421-oil-free reservoir: Al(OH)3 precipitate was prepared by reacting 2 mol / L AlCl3·6H2O solution with 28% NH3·H2O, and the precipitate was repeatedly washed with distilled water until NH4+ was undetectable. + Then, according to the ratio of 16:1, a certain amount of NaHCO3 was added to the Al(OH)3 suspension and stirred evenly. The pH value of the system was adjusted to 9, 9.5 and 10 respectively with NaOH. Finally, the reaction solutions with different pH values ​​were placed into the 300ml polytetrafluoroethylene inner liner of the Hastelloy reactor (11) with a filling degree of 65%. The reactor was placed in a muffle furnace (12) and reacted for 12h and 24h respectively at 100℃, 120℃ and 140℃. After the hydrothermal reaction was completed, it was naturally cooled, taken out at room temperature, and liquid-solid separation was performed. The generated solid phase was filtered and repeatedly rinsed with distilled water. It was dried at 60℃ for 24h and analyzed by X-ray diffraction and scanning electron microscopy. Through the phase analysis and particle size determination of the reaction products, the optimal experimental conditions for artificial synthesis of aluminum aluminum oxide were obtained, and aluminum aluminum oxide with single phase, complete crystal shape and good uniformity was obtained. Characterization of the S422-oil-bearing reservoir: Al(OH)3 precipitate was prepared by reacting 2 mol / L AlCl3·6H2O solution with 28% NH3·H2O, and the precipitate was repeatedly washed with distilled water until NH4+ was undetectable. + Until then; then, according to a ratio of 16:1, add to Al(OH)3 A certain amount of NaHCO3 and a certain amount of crude oil were added to the suspension and stirred evenly. The amount of crude oil added was adjusted according to the oil-water ratio of 1:1, 1:5 and 1:

10. The pH value of the system was adjusted to 9, 9.5 and 10 respectively with NaOH. Finally, the reaction solutions with different pH values ​​were placed into the 300ml polytetrafluoroethylene liner of the Hastelloy reactor (11) with a filling degree of 65%. The reactor was placed in a muffle furnace (12) and reacted for 12h and 24h respectively at 100℃, 120℃ and 140℃. After the hydrothermal reaction was completed, the mixture was cooled naturally and taken out at room temperature for liquid-solid separation. The solid phase was filtered and repeatedly rinsed with distilled water. It was dried at 60℃ for 24h and analyzed by X-ray diffraction and scanning electron microscopy. The optimal experimental conditions for artificial synthesis of aluminum aluminum oxide were obtained through phase analysis and particle size determination of the reaction products. A single-phase aluminum aluminum oxide with complete crystal shape and good uniformity was obtained. Characterization of hydrocarbon charging conditions for S423-sodium aluminum oxide enrichment: X-ray diffraction and scanning electron microscopy analysis were performed on the solid phase materials generated by the two reactions. By comprehensively comparing the quality, composition and morphological characteristics of the solid phase products, and combining the results of natural analogy, the influence of hydrocarbon charging on the formation of sodium aluminum oxide was characterized.

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