18 results about "Isotope fractionation" patented technology

The invention relates to a shale or coal rock gas evaluation method based on a gas-water two-phase flow isotope fractionation model. The shale or coal rock gas evaluation method comprises the following steps: 1, collecting data; 2, establishing a gas well model; 3, establishing a control equation set; 4, coupling the influence of the real gas effect and the effective stress; 5, establishing a gas transmission model and a relative permeability model; 6, establishing a relation between capillary pressure and saturation; 7, considering critical desorption pressure; 8, setting boundary conditions of initial conditions; 9, solving a control equation set; 10, calculating production dynamic parameters and isotope values; 11, performing history fitting; 12, verifying historical fitting quality; 13, predicting productivity; 14, calculating a gas dynamic output proportion; 15, identifying a fractionation inflection point and gas production mechanism conversion; by coupling gas-water two-phase flow, multiple gas transmission mechanisms, stress sensitivity and methane isotope competitive adsorption theories, yield prediction of the deep reservoir and quantitative evaluation of the dynamic proportion of produced gas are realized.

This invention discloses a method for accurately tracing geological hydrogen migration, belonging to the field of geological hydrogen exploration and migration tracing technology. The invention involves preparing stable hydrogen isotopes and radioactive tritium tracers with specific geochemical fingerprints and injecting them into target geological units; deploying a three-dimensional monitoring network including sensor arrays and automatic samplers to collect hydrogen concentration data and gas samples in real time; laboratory analysis to determine hydrogen isotope composition and rare gas concentrations, using an N2-He-Ar ternary diagram to identify gas sources and eliminate interference; integrating data and performing numerical simulations using migration control equations coupled with isotope fractionation effects, optimizing parameters through inversion algorithms; and generating a three-dimensional visualization map of hydrogen migration paths and a quantitative report based on the inversion results. This invention achieves a breakthrough in geological hydrogen migration from qualitative detection to quantitative tracking, significantly improving the reliability and accuracy of tracing, enabling real-time dynamic capture of the migration process, and providing precise decision-making basis for hydrogen exploration.

The invention discloses a rock cross-cut rubidium deposit rubidium occurrence state and deposit cause analysis method and device and a medium, and belongs to the technical field of deposit cause analysis. A first strain mode sample and a second strain mode sample are distinguished based on divergence characteristics of strain space distribution, and a first-class rubidium occurrence horizon and a first-class enrichment mechanism are judged by utilizing a space lag relationship between an isotope fractionation peak position and a strain peak position; and judging a second-class rubidium occurrence layer and a second-class enrichment mechanism according to a rubidium concentration gradient mutation position around the fluid inclusion, and coupling an enrichment direction of a sample scale with a fracture structure or a permeable stratum to delineate a mineralization area. According to the method, the lattice position quantitative judgment of the rubidium occurrence state, the dynamic process distinguishing of the mineralization mechanism and the geologic structure constraint delineation of the mineralization area are realized.

The application relates to a shale or coal rock gas evaluation method based on a gas-water two-phase flow isotope fractionation model, which comprises the following steps: 1, collecting data; 2, establishing a gas well model; 3, establishing a control equation set; 4, coupling the influence of real gas effect and effective stress; 5, establishing a gas transmission model and a relative permeability model; 6, establishing a capillary pressure and saturation relationship; 7, considering critical desorption pressure; 8, setting initial conditions and boundary conditions; 9, solving the control equation set; 10, calculating production dynamic parameters and isotope values; 11, performing history matching; 12, verifying the quality of history matching; 13, predicting productivity; 14, calculating gas dynamic output proportion; 15, identifying fractionation inflection points and gas production mechanism conversion; the application realizes the quantitative evaluation of deep reservoir production prediction and output gas dynamic proportion by coupling gas-water two-phase flow, multiple gas transmission mechanisms, stress sensitivity and methane isotope competitive adsorption theory.

The invention relates to the technical field of mineral extraction, particularly discloses a method for efficiently extracting barite single mineral in black mudstone rich in organic matters, and solves the technical problems that micron-sized barite in black mudstone cannot be efficiently extracted in the prior art, lattice destruction / isotope fractionation of barite is easily caused in the extraction process, the purity and the recovery rate are low and the like. The purity of the extracted barite single mineral is larger than or equal to 99%, the recovery rate of fine-fraction barite is larger than or equal to 90%, crystal lattices are complete and free of damage, isotope fractionation and component change are avoided, and the high-precision geochemical test requirement can be met; meanwhile, the method is suitable for various sedimentary rocks such as marine / continental black mudstone, shale and siliceous mudstone, and the applicability is wide.

The invention discloses a shale / coal rock in-situ gas content and occurrence state quantitative evaluation method based on multi-method coupling. The shale / coal rock in-situ gas content and occurrence state quantitative evaluation method comprises the following steps: 1, establishing an on-site analysis experiment device; 2, implementing an on-site analysis experiment process; 3, processing data and summarizing parameters; 4, evaluating the in-situ gas content by using a USBM method; 5, evaluating the in-situ gas content by applying a polynomial method; 6, evaluating the in-situ gas content by applying an ACF method; 7, evaluating the in-situ gas content by applying an MCF method; 8, evaluating the in-situ gas content by applying an isotope fractionation method (CIF method); and 9, multi-method result comparative analysis and comprehensive evaluation. According to the method, a novel adsorption gas / free gas quantitative identification method is established based on an isotope fractionation mechanism, accurate quantitative characterization of the in-situ gas content and the gas occurrence state of the deep unconventional reservoir is realized, a scientific basis is provided for reserve evaluation, favorable target optimization and development scheme optimization, and the method has a wide application prospect. The method is suitable for both deep shale gas and deep coal and rock gas.

The present application provides a kind of quantitative evaluation shale gas preservation condition method, comprising steps 1. Collecting gas sample to be evaluated area and carrying out natural gas component and isotope characteristic analysis.Step 2. Based on the kinetic Rayleigh fractionation model of carbon isotope in kerogen hydrocarbon generation process, the reaction process F of system is determined.Step 3. Determine the isotope fractionation factor ε.Step 4. The prediction of methane generation amount.Step 5. Quantitative characterization of natural gas dissipation efficiency.Step 6. Comprehensive evaluation of shale system preservation condition.The present application perfects the quantitative evaluation method of shale gas preservation condition, helps the comprehensive evaluation of shale preservation condition in complex tectonic deformation area of Sichuan Basin periphery, provides basis for the search of beneficial target area in shale gas exploration, and speeds up the exploration and development process of shale gas reservoir.

The invention discloses a high-temperature and high-pressure natural gas solubility determination and isotope fractionation simulation experiment device and method. The device comprises a gas supply module, a liquid supply module, an integrated reaction kettle, a vacuum module, an independent double-path gas collection module, a test analysis module and a computer control system. The method comprises the following steps: injecting a solution and natural gas into a reaction kettle until dissolution equilibrium, and introducing a state equation to directly calculate theoretical dissolved gas volume and solubility; independently collecting residual free gas in an equilibrium state and overall desolventized gas, determining isotopes, and calculating a thermodynamic equilibrium fractionation coefficient in the dissolution process; natural gas is induced to be continuously desolventized, instantaneous desolventized gas is collected in sections, isotopes are measured, and solvokinetic fractionation parameters are calculated in combination with a Rayleigh model. The whole process is completed in situ in the same kettle body, fluid transfer errors are thoroughly eliminated, and a reliable evaluation means is provided for deep natural gas reservoir forming simulation.

The invention discloses a method for measuring an element distribution coefficient and an isotope fractionation value between a fluid and a melt, and belongs to the field of stable isotope geochemistry, and the method comprises the following steps: preparing an initial fluid and an initial solid phase; performing isotope exchange reaction by using the initial fluid and the initial solid phase; an experimental fluid phase and an experimental melt phase in a reaction product are separated through freezing and deionized water cleaning; and determining the metal element content and stable isotope composition of the experimental fluid phase and the experimental melt phase, and calculating the metal element distribution coefficient and isotope fractionation value between the experimental fluid phase and the experimental melt phase. According to the method, after isotope exchange equilibrium of the rapid quenching cold-sealed autoclave, the fluid phase and the silicate rock phase are frozen and then separated, the fluid phase and the silicate rock phase are precisely separated and recovered through multi-step deionized water cleaning, precise analysis of the metal element content and the isotope composition of the two phases is achieved, and the analysis precision of the metal element content and the isotope composition of the two phases is improved. And the method has positive significance on isotope geochemistry development.

A carbonate rock stability prediction method based on calcium isotope fractionation characteristics, relates to the technical field of oil and gas development, including the following steps, collecting carbonate rock samples of the target area, obtaining the calcium isotope ratio δ 44 / 40 Ca and auxiliary geochemical parameters, wherein the auxiliary geochemical parameters include the content of Mg, Sr, Ca elements, and the content ratio of Sr / Ca, Mg / Ca elements, in combination with the calcium isotope ratio δ 44 / 40 Ca and Sr / Ca element content ratio test results, judge the sample diagenetic mode, based on the sample diagenetic mode, calculate the mineral recrystallization rate in the diagenetic process, calculate the rock stability index through the mineral recrystallization rate, and classify and predict the stability of the reservoir rock mass of the carbonate rock sample according to the rock stability index; the present application can accurately identify the early micro-recrystallization event hidden by traditional carbon and oxygen isotope means by using the mass fractionation effect of calcium isotope and the high sensitivity of calcium isotope system in low-temperature diagenetic environment.

The application discloses a method for determining lithium isotopes in coal by secondary ion mass spectrometry, and relates to the technical field of coal-based metal isotope determination; the application identifies the occurrence phase of lithium in coal before SIMS testing, and performs SIMS analysis in a single occurrence phase, so that the problem of poor lithium isotope testing accuracy caused by mixed occurrence phases is effectively avoided; in the SIMS testing, a reference material similar to the lithium occurrence phase in the coal sample to be tested in chemical composition and structure is used, a suitable correction strategy is proposed, the differences in secondary ion amounts and isotope fractionation under different matrix conditions are corrected, and the interference of the matrix effect is reduced; the occurrence phase of lithium is set to match the SIMS testing parameter combination, so that the secondary ion signal is more stable, and the testing repeatability is improved; the method disclosed by the application is helpful to realize stable and accurate in-situ determination of lithium isotopes in different occurrence phases in coal.

The invention relates to a pegmatite type lithium ore deep exploration method and device based on lithium isotope fractionation, and the method comprises the steps: determining pulse segment attributes according to the thickness of a pulse body, and formulating a sampling rule; different sampling strategies are adopted for different pulse section attributes, for example, sampling methods of thin pulses and thick pulses are different, and areas with strong mineralization states need to be sampled more densely, so that the representativeness of samples and the accuracy of analysis are ensured, and data deviation caused by improper sampling is avoided; through cooperative in-situ analysis and powder sample analysis, the interference of mineral crystallization differentiation on fluid direction judgment is eliminated, and the accuracy of fluid migration direction judgment is improved compared with that of single powder analysis; in-situ multi-test-point data and powder data are mutually verified, the fractionation coefficient can serve as a data validity criterion, misjudgment caused by single test errors is reduced, and finally based on the accurate migration direction, the accuracy of drilling deployment is ensured, invalid drilling is reduced, and the deep exploration efficiency of pegmatite type lithium ore is improved.

The invention provides a geological survey method for recovering metamorphic rock protolith types by utilizing boron isotope fractionation characteristics. The method comprises the following steps: establishing a benchmark database containing a plurality of non-metamorphic protorock boron isotopes and key inactive element contents; a double-control correction model of boron isotope fractionation is established, quantitative function relationships between a distribution coefficient and pressure and between a fractionation coefficient and temperature are respectively established through high-temperature and high-pressure experimental data, and a fluid activity factor is introduced to form an inversion calculation equation. The model is used for inversion to obtain original boron isotope composition, then the original boron isotope composition and key element indexes are subjected to collaborative analysis, a two-dimensional discrimination diagram is constructed, and the protolith type is finally determined by comparing discrimination regions in a reference database. According to the method, the metamorphic fractionation effect is effectively corrected, and the accuracy and reliability of high-grade metamorphic rock protolith recovery are remarkably improved in combination with double geochemical index constraints. The method can be matched with portable on-site analysis equipment, and field rapid discrimination is realized.

A quantitative evaluation method for in-situ gas content and occurrence state in shale / coal formations based on multi-method coupling includes the following steps: 1. Establishing an in-situ analytical experimental setup; 2. Implementing the in-situ analytical experimental procedure; 3. Data processing and parameter summarization; 4. Evaluating in-situ gas content using the USBM method; 5. Evaluating in-situ gas content using the polynomial method; 6. Evaluating in-situ gas content using the ACF method; 7. Evaluating in-situ gas content using the MCF method; 8. Evaluating in-situ gas content using the isotope fractionation method (CIF method); 9. Comparative analysis and comprehensive evaluation of the results from multiple methods. This method establishes a novel approach for the quantitative identification of adsorbed / free gas based on the isotope fractionation mechanism, achieving accurate quantitative characterization of in-situ gas content and gas occurrence state in deep unconventional reservoirs. It provides a scientific basis for reserve assessment, selection of favorable targets, and optimization of development schemes, and is applicable to both deep shale gas and deep coal gas.

A system and method for quantifying carbon mineralization in basalt during carbon sequestration includes the steps of: obtaining initial conditions at a geological site, including establishing initial ratio conditions for at least two isotope systems; determining the subsequent state after the initiation of carbon dioxide source injection at the geological site; and determining the characteristics of mineralization by performing multi-isotope fractionation analysis using the subsequent state and initial conditions.

The application provides a geological survey method for restoring protolith types of metamorphic rocks by using boron isotope fractionation characteristics. The method establishes a benchmark database containing boron isotopes and contents of key inactive elements of various unmetamorphic protoliths. A double-control correction model of boron isotope fractionation is established, quantitative function relationships between distribution coefficients and pressure and between fractionation coefficients and temperature are respectively constructed by using high-temperature and high-pressure experimental data, and a fluid activity factor is introduced to form an inversion calculation equation. The original boron isotope composition is obtained by using the model, and then the original boron isotope composition is analyzed in cooperation with the key element index to construct a two-dimensional discrimination diagram, and finally, the protolith type is determined by comparing the discrimination area in the benchmark database. The application effectively corrects the metamorphic fractionation effect, and significantly improves the accuracy and reliability of the protolith restoration of high-grade metamorphic rocks by combining the double-geochemical index constraint. The method can be matched with portable field analysis equipment to realize rapid discrimination in the field.

This invention discloses a method, equipment, and medium for analyzing the occurrence state and genetic genesis of rubidium in the Shimen rubidium deposit, belonging to the field of ore genetic analysis technology. The method includes: identifying structurally anomalous samples by calculating the deviation between theoretical and measured structural parameters; distinguishing between first-strain mode samples and second-strain mode samples based on the divergence characteristics of strain spatial distribution; determining the first type of rubidium occurrence layer and the first type of enrichment mechanism by utilizing the spatial lag relationship between isotope fractionation peak positions and strain peak positions; determining the second type of rubidium occurrence layer and the second type of enrichment mechanism by identifying the abrupt changes in rubidium concentration gradient around fluid inclusions; and delineating the mineralized region by coupling the enrichment direction at the sample scale with fracture structures or permeable strata. This invention achieves quantitative determination of the lattice position of rubidium occurrence, differentiation of the kinetic processes of mineralization mechanisms, and delineation of the geological structural constraints of mineralized regions.