44 results about "Coal measures" patented technology

The invention relates to the technical field of ore recognition, in particular to a method and a system for quickly and preliminarily recognizing field ore quality of coal-series trilean metal mineral products, which comprises the following steps of: acquiring ore samples and acquiring main peaks, structures and infrared images, extracting image features to generate mutation numbers, analyzing sampling coordinates to reconstruct a connection structure, and calculating the quality of the coal-series trilean metal mineral products. Drawing a closed boundary to judge coordinate attribution, and outputting an ore quality identification scheme. According to the method, main peak reflection, microscopic image layers and infrared spectrum acquisition results are numbered in a unified manner and are subjected to time sequence binding, a synchronous corresponding relation among multi-source images is established, continuous change nodes and sudden change areas are identified in combination with offset tracks and structural features, spatial concentration blocks are generated by using number and coordinate mapping, and a connected structure is reconstructed; and drawing a closed boundary according to the track to form a region classification basis, verifying a mass change direction through image sequence coherence, and outputting a tagging identification result, thereby realizing rapid positioning and accurate classification of the field ore sample.

The invention discloses a method and device for identifying a coal reservoir, and the method comprises the steps: obtaining a coal rock sample of a target interval, and carrying out a thermogravimetric experiment on the coal rock sample; performing image analysis on data obtained by the thermogravimetric experiment to determine a first coal series reservoir; performing thermogravimetric mass spectrometry data analysis on the coal rock sample corresponding to the first coal series reservoir; and determining a final coal reservoir according to a thermogravimetric mass spectrometry data analysis result.

The invention relates to the technical field of unconventional resource development, in particular to a method and a device for determining lithology space-time distribution characteristics of coal measure gas, and the corresponding method comprises the following steps: building a sequence stratigraphic framework of a target work area according to rock debris logging data and logging data of the target work area; determining dominant storage lithology corresponding to each coal series gas; according to the sequence stratigraphic framework and the advantage storage lithology corresponding to each type of coal measure gas, establishing a well connection section and a lithology plane graph; and according to the well connection profile and the lithologic plan, determining the lithologic spatial-temporal distribution characteristics of the coal-series gas. The effective determination method of the lithology space-time distribution rule is formed on the basis of combination of the sequence strata, the rock core and the logging, rock core constraint, logging lithology correction and high-precision sequence strata isochronous framework constraint, and then the lithology space-time distribution rule of coal bed gas, coal series shale gas and coal series tight sandstone gas evaluation is determined.

The embodiment of the invention provides a simulation experiment device and method for coal-series gas enrichment, and relates to the technical field of natural gas exploration and development. The simulation experiment device for coal series gas enrichment comprises a first reaction cabin, a second reaction cabin and a third reaction cabin which are sequentially communicated and stacked, the first reaction cabin is used for containing a bottom rock sample, the second reaction cabin is used for containing a coal seam sample, and the third reaction cabin is used for containing a top rock sample; the injection system is communicated with the first reaction cabin; the first reaction cabin, the second reaction cabin and the third reaction cabin are respectively provided with at least one stress loader and at least one heater. Through collaborative design of multi-cabin layered sample bearing and independent stress and temperature regulation, confining pressure constraint and interlayer stress transfer of a top plate rock sample and a bottom layer rock sample to a coal seam sample are accurately simulated, the real occurrence environment of coal series gas in a stratum is reduced, the influence of interlayer stress on coal series gas enrichment is prevented from being ignored, and obtained experimental data are more reliable.

This invention belongs to the field of quartz sandstone purification technology, specifically relating to a simple purification method for coal-based graphite, comprising the following steps: crushing low-grade coal-based graphite as raw material to obtain crushed coal-based graphite; mixing the crushed coal-based graphite with solid alkali and flux, followed by calcination and alkali fusion treatment to obtain calcined and alkali-fused coal-based graphite; acid leaching the calcined and alkali-fused coal-based graphite, followed by water washing, filtration, and drying to obtain high-grade coal-based graphite. Compared with existing graphite purification technologies, this invention does not require costly and hazardous reaction reagents or harsh conditions of high temperature and high pressure, and has advantages such as high graphite product purity, simple processing, convenient operation, mild conditions, environmental friendliness, and low cost. Using low-grade coal-based graphite with a fixed carbon content of 65%–85% as raw material, the process of this invention can obtain high-purity graphite with a fixed carbon content greater than 99.5%.

The application discloses a kind of complex coal measures strata double horizontal well cyclic injection CO2 vertical displacement coalbed gas mining method, belong to coalbed gas development technical field.Deep coal measures strata is selected as purpose layer, and two single branch horizontal wells are drilled in the same well group.One horizontal section is located at the top of purpose layer for coalbed gas extraction and fracturing;Another horizontal section is located at the bottom of purpose layer for injecting liquid CO2.Before extraction, by continuously injecting liquid CO2 into the bottom of purpose layer, the displacement and displacement effect of CO2 on CH4 are used to improve the recovery of deep coalbed gas;During extraction, part of CO2 is extracted with CH4, and the extracted CO2 is liquefied and recycled into the bottom of purpose layer through CO2 separation device;At the end of extraction, most of CH4 has been extracted, and the horizontal well is sealed to prevent CO2 from leaking, achieving the purpose of CO2 storage.The method is simple and easy to implement, and can be used for complex structure of purpose layer.

The invention provides a coal measure strata tight sandstone gas earthquake identification method and device, and relates to the technical field of earthquake gas reservoir prediction, and the method comprises the steps: carrying out the coal seam multiple suppression processing of the seismic data of a target work area, and obtaining the preprocessed seismic data; generalized S transformation is carried out on the preprocessed seismic data to obtain time-frequency spectrum data; extracting a plurality of gas layer sensitive time-frequency attributes from the time-frequency spectrum data; and performing multi-attribute well control fusion processing on the plurality of gas reservoir sensitive time-frequency attributes to obtain a gas reservoir sensitive factor, and based on the gas reservoir sensitive factor, generating an earthquake identification map for identifying the tight sandstone gas of the coal measure strata. According to the method, the data signal-to-noise ratio is increased by pressing coal bed interlayer multiples, multi-angle gas bed sensitive time-frequency attributes are extracted through high-resolution time-frequency analysis, a visual recognition map is generated through well control fusion, the problem that tight sandstone gas weakness response is difficult to recognize due to coal bed strong shielding is systematically solved, and the method has the advantages of being high in practicability and the like. And the identification precision and reliability are improved.

The present application relates to the technical field of geological modeling, in particular to a deep stratum petrophysical modeling method under complex lithology background, comprising the following steps: well logging data preprocessing, mineral model optimization processing, petrophysical modeling and shear wave prediction, and verification of the accuracy of the petrophysical model in predicting shear wave. The present application adopts four mineral models of quartz-clay model, calcite-clay model, coal and bauxite, respectively, and performs optimal multi-mineral model processing in stratigraphic sections, so as to obtain the petrophysical modeling of deep coal measure stratum complex lithology combination and pore structure under shear wave prediction, and improve the accuracy of shear wave prediction.

The invention discloses a monitoring method and system based on a coal-series plastic seepage-resistant layer, and the method comprises the steps: delimiting a monitoring region of the coal-series plastic seepage-resistant layer, collecting micro-seismic data and geological exploration data in the monitoring region, drawing a geological structure map, marking a bearing layer, a critical layer and an external layer in the geological structure map, wherein the bearing layer is located at the overlying and underlying positions of a coal mining operation area, the external connection layer is located at the boundary of a monitoring area, the joint part of the bearing layer and the external connection layer is a critical layer, a deployment route of the distributed optical fibers in the bearing layer is set, and a plurality of key nodes are selected from the deployment route and defined as the installation positions of the branching devices. According to the method, the abnormal section is searched, so that the local deformation or offset area of the coal-series plastic seepage-resistant layer and the adjacent layer position can be accurately positioned, the dynamic risk assessment and real-time early warning of the monitoring area are effectively realized, and the long-term stability and safe operation of the coal mining process are ensured.

The invention relates to the technical field of tunnel construction, in particular to a mountain coal measure stratum high-temperature steam injection fracturing method and system. According to the fracturing method, continuous and real-time monitoring of temperature field spatio-temporal evolution in the fracturing process is achieved through a distributed optical fiber temperature sensing technology; a micro-seismic signal generated by fracturing is captured through a distributed optical fiber sound wave sensing technology, underground apparent shear wave velocity profile imaging is obtained, multi-parameter collaborative analysis and fusion are carried out on temperature field evolution, micro-seismic event spatial distribution and apparent shear wave velocity profile changes before and after fracturing, and comprehensive and accurate delineation of a hot steam injection fracturing influence range is achieved; the fracturing system is based on the high-temperature steam injection fracturing method for the mountain coal measure strata, the structure is simple, arrangement is easy, the fracturing effect under the thermal-mechanical coupling effect in the hot steam injection fracturing process can be accurately represented in real time, and an effective means is provided for optimizing gas extraction of the mountain coal measure strata and guaranteeing tunnel construction safety.

The invention discloses a coal measure tight sandstone thin reservoir prediction method based on seismic frequency division configuration inversion, and relates to the technical field of oil-gas exploration and development, and the method comprises the steps: 1, collecting logging curve data, and carrying out the standardization processing; 2, performing wavelet transform on the standardized data to extract a signal, and reconstructing the extracted signal through wavelet inverse transform to obtain a pseudo-wave impedance curve; 3, constructing a frequency division configuration model according to the simulated wave impedance curve and the collected seismic data; 4, according to the frequency division configuration model, random inversion is carried out through a Markov chain Monte Carlo random algorithm, and reservoir parameters are obtained. According to the method, phase control-logging-seismic data are combined, and frequency division configuration inversion is fused into the lithology and fluid sensitive reconstruction curve to realize accurate prediction of the coal measure tight sandstone thin reservoir.

The invention discloses an inversion method and device for a longitudinal-transverse wave velocity ratio of a coal measure strata, and the method comprises the steps: determining the longitudinal-transverse wave velocity ratio reflectivity of a target interval according to the prestack angle gather data of the target interval, and extracting the attribute data of the longitudinal-transverse wave velocity ratio reflectivity through employing the AVO technology; according to the longitudinal and transverse wave velocity ratio curve, the attribute data of the longitudinal and transverse wave velocity ratio reflectivity and preset wavelet extraction time window parameters, wavelet extraction is carried out on the target layer section through the wavelet extraction technology; the longitudinal and transverse wave velocity ratio curve is determined according to logging data; and according to the wavelet and the attribute data of the velocity ratio reflectivity of the longitudinal and transverse waves, performing post-stack compressed sensing reflection coefficient inversion to obtain an inversion result of the velocity ratio reflectivity of the longitudinal and transverse waves. According to the invention, a stable inversion result of the longitudinal and transverse wave velocity ratio can be effectively obtained.

The application discloses a coal measure stratum tunnel harmful gas surveying and evaluating method, which comprises the following steps: based on the regional coal rock geological background and the regional geological condition, the tunnel body is segmented according to the engineering geology; test holes are arranged to measure the coal measure stratum magnetization rate and the ton coal gas content, and the relationship between the ton coal gas content and the magnetization rate is fitted as Q0=2.35*10 ‑2 ×e (C / 32.34) -0.05; 3) surveying holes are arranged according to the engineering geology segmentation, the tunnel body coal measure stratum section is inferred according to the occurrence, the rock stratum magnetization rate in the surveying hole is measured through the comprehensive well logging test in the hole; based on the measured magnetization rate in the hole, the ton coal gas content of each test hole of the tunnel is calculated, the ton coal gas content change curve of the coal measure tunnel is drawn, and the gas comprehensive evaluation of the tunnel segmentation is carried out. Through the division of the tunnel body according to the engineering geology segmentation, the relationship between the ton coal gas content and the magnetization rate is fitted, the gas concentration detection and the content calculation are reduced while ensuring the continuous exploration, the surveying period is shortened, and the surveying cost is saved.

The application provides a coal measure gas multilayer combined mining device, method and system. The device comprises a plurality of mining assemblies arranged at respective target reservoirs in a well. The mining assemblies are arranged in the perforated sections of the target reservoirs. The mining assemblies divide the oil casing annular area in the well into independent mining areas corresponding to the perforated sections and flow channels that keep the oil casing annular area continuously communicated. The independent mining areas have a mining outlet that is communicated with the oil casing annular area and unidirectionally conducted. Based on the technical scheme of the application, the interference between different reservoirs of a coal measure straight well can be avoided, the significance of combined mining due to interlayer interference can be avoided, precise control can be provided for gas well extraction, accurate production data can be provided in real time, and reliable technical means can be provided for fine management of coal measure gas straight well extraction.

The invention belongs to the field of mine geophysical prospecting, and discloses a mining-while-electrical-method advanced detection pure anomaly enhancement method which specifically comprises the following steps: step 1, mining-while-electrical-method data acquisition; 2, superposing and averaging observation data at the same position; step 3, extracting pure abnormal response in front of the tunneling head-on; 4, enhancing the pure abnormal response strength in front of the tunneling head-on; and 5, restoring the apparent resistivity and the voltage value. According to the method, the stability of advanced detection data of the mining-following electrical method in a noise environment is improved; background influences such as random noise, coal measure strata, roadway cavities, roadway side anomalies and excavation head-on mining damage are eliminated, and extraction of pure anomaly response in front of an excavation head-on is achieved; the abnormal response intensity of the water disaster hidden danger in front of the tunneling working face is effectively enhanced, and the effective detection distance of advanced detection of the tunneling electric method is increased.

The present application provides a kind of coal-based mesophase pitch and its preparation method, belong to pitch preparation technical field.The preparation method includes the following steps: coal-based raw pitch is pretreated, and refined coal pitch is obtained;Distillation is carried out on refined coal pitch, and distillation coal pitch is obtained;Heat polycondensation reaction is carried out on distillation coal pitch, and coal-based mesophase pitch is obtained.The present application uses single coal-based raw pitch as raw material, with the help of the combination of pure physical purification of refining-distillation, cooperatively removes impurities and controls material composition, reduces the quinoline insoluble content of coal pitch to below 0.1wt%.On this basis, through non-catalytic heat polycondensation reaction, the mesophase conversion rate is significantly improved, and the performance consistency of the obtained product as carbon material precursor is improved.The process is simple, controllable, energy-saving and cost-effective, which provides a reliable technical path for the high-value utilization of coal tar pitch and the large-scale stable production of high-end carbon materials.

The application provides an electric pulse fracturing and gas displacement integrated experiment system and method, which comprises a running chamber, a water injection system, a gas injection system, a water outlet detection system, a gas extraction detection system and an electric pulse system, wherein all the inner wall surfaces of the running chamber are provided with the electric pulse system, the water outlet of the water injection system is communicated with the water inlet at the upper part of the running chamber, the water outlet at the lower part of the running chamber is communicated with the water inlet of the water outlet detection system, the gas outlet of the gas injection system is communicated with the gas inlet at the lower part of the running chamber, and the gas outlet at the upper part of the running chamber is communicated with the gas inlet of the gas extraction detection system; the application analyzes the gas extraction effect during the process of electric pulse fracturing and gas displacement by using laboratory means, simultaneously considers the influence of the actual formation pressure and hydrogeological conditions on the experiment process, makes the experiment simulation closer to the real geological conditions, and provides reliable experimental basis for the exploration and development of coalbed gas and gas treatment.

The invention discloses application of a'mine multi-source data geological support system 'geological support system, belongs to the field of coal mine geological support, and particularly relates to construction of a mine transparent geological and multi-source geological support system platform. The invention designs a mine multi-source data geological support system, and the system builds a coal measure stratigraphic framework based on three-dimensional seismic data and geostatistical inversion thereof. The geological model is constrained by drilling and horizon data, the geological model is optimized in combination with mine multi-source data detection data, and the geological model is updated and adjusted in real time by utilizing geological data and information which are updated in real time so as to reflect the newest state and change trend of a geological body. In addition, the geological guarantee system also considers module projects such as gas power, hydrogeological prediction and post-mining geological management. The embedded intelligent algorithm can deeply mine various measurement data features, and the workload and professional dependence of manual data analysis are reduced. The working efficiency of mine management personnel is improved through interactive and diverse geological data formats, and more visual geological parameters are provided through the three-dimensional visualization technology. Aiming at the functions of the method of the mine multi-source data geological support system, the mine multi-source data geological support system can be used in the fields of mine geological modeling, geological management and intelligent mining.

The invention discloses a method for flotation enrichment of titanium / iron impurities in coal series kaolinite, and relates to the technical field of purification / flotation separation of coal series kaolinite. According to the invention, a density functional theory is used as a guide, and molecular simulation software is used for screening a solid-loving group with a targeted adsorption effect on titanium / iron impurities; constructing a lattice type Ti / Fe doped kaolinite active site model, calculating and comparing the adsorption energy difference of a solid affinity group on a Ti / Fe site and an undoped kaolinite surface, screening a targeted functional group, and selecting a commercially available collecting agent according to the targeted functional group; according to the method, screening and magnetic separation pretreatment are combined to reduce interference, then reverse flotation is carried out, so that a kaolinite component with a high titanium / iron impurity ratio selectively floats in a hydrophobic mode under the action of a collecting agent, the kaolinite component which does not contain or only contains a small amount of Ti / Fe keeps hydrophilic and is left in a groove, and impurity removal and whitening of coal series kaolinite are achieved.

This invention discloses a flotation separation method for Fe / Ti impurities in coal-series kaolinite based on the impurity occurrence state, comprising the following steps: performing process mineralogical analysis on the raw coal-series kaolinite ore, and constructing single-mineral systems accordingly, including a kaolinite mineral system, an iron-bearing mineral system, and a titanium-bearing mineral system; conducting flotation tests and surface property tests on each constructed single mineral under different collector system conditions to obtain the differences in floatability and interfacial properties of each single mineral under different reagent conditions; and determining and implementing the raw ore flotation scheme. This invention, by constructing single-mineral flotation systems of kaolinite, siderite, and rutile, can establish the correspondence between different minerals and different collectors, providing a basis for determining the raw ore flotation scheme and flotation conditions, and improving the targeting of flotation separation.

The invention belongs to the technical field of ecological restoration, and particularly relates to a preparation method of artificial soil based on coal-series solid waste, which comprises the following steps: (1) crushing and screening coal gangue to obtain coal gangue powder; (2) crushing and screening the weathered coal to obtain weathered coal powder; (3) uniformly mixing fly ash, calcium powder, aluminum powder and water to obtain a mixture; (4) performing steam curing treatment on the mixture, cooling after the steam curing treatment is finished, and then crushing and screening again to obtain modified fly ash; and (5) uniformly mixing the coal gangue powder, the weathered pulverized coal and the modified fly ash to obtain the artificial soil. The invention also relates to the artificial soil obtained by the preparation method and application thereof. The artificial soil is almost completely composed of coal-based solid waste, can promote rapid generation of soil aggregate structures, and provides rich nutrients for the soil; in addition, the artificial soil can get rid of dependence of traditional artificial soil on external materials, standardized production of artificial soil products is achieved, and rapid application and popularization are facilitated.

The invention relates to the technical field of coal-bearing basin resource exploration, and provides an acidic water sedimentary basin coal measure strata fine-grained rock lithofacies classification method. The method comprises the following steps: firstly, carrying out kerogen separation and organic element, TOC (Total Organic Carbon) and total rock analysis test on different rock core samples; the mass ratio Cd of the organic carbon in the organic elements is calculated, and then the total organic matter mass fraction is obtained; carrying out normalization treatment on four-end-member components including total organic matters, long quartz minerals, clay minerals and carbonate minerals; and finally, first-level and second-level lithology classification is performed according to the total organic matter content and the contents of the three types of components in sequence, and fine-grained rock facies classification is determined in combination with sedimentary structure analysis. The method for determining the conversion coefficient of the organic carbon and the organic matter is high in pertinence and more accurate; the lithofacies classification scheme fully considers the effect of organic matter components in lithofacies division of coal-series fine-grained rocks, is more suitable for coal-series fine-grained rocks with wide organic carbon content distribution, and can better reflect the advantages, disadvantages and differences of coal-series fine-grained rocks with different organic matter contents.

This invention relates to the field of resource valuation technology, specifically a method for evaluating the quality of coal-bearing rare metal minerals. It constructs multi-dimensional attribute data through spectral scanning of core samples, introduces sequence position weights to correct polymetallic concentrations, and combines grade interval determination and conflict identification mechanisms to determine the quality grade of coal-bearing rare metal minerals. This invention focuses on the stratigraphic continuity and multi-element synergistic characteristics of coal-bearing rare metal mineral quality formation. It acquires polymetallic information from core samples using spectral methods and constructs continuous attribute expressions based on the collected sequences. During the evaluation process, stratigraphic position weights are introduced to reflect the influence of different depths on the enrichment degree of rare metals, shifting the quality determination from discrete numerical values ​​to a comprehensive expression with stratigraphic constraints. In grade classification, interval matching and distribution ratio analysis are introduced to identify differences in multi-element orientations, and the degree of boundary deviation is used to screen for more representative quality grades, improving the consistency and reliability of coal-bearing rare metal mineral quality evaluation.

The invention relates to a method for optimizing a favorable area of coal series source rocks in a high-over mature stage, and belongs to the technical field of oil-gas exploration. The method comprises the following steps: firstly, based on a geochemical parameter relation, determining an effectiveness evaluation standard of coal series source rocks in a high-over mature stage; determining TOC calculation formulas and identification standards of different source rocks based on correlation between actually measured TOC of different coal measure source rocks and logging parameters and logging responses of different source rocks; and finally, constructing coal measure source rock favorable area evaluation parameters, calculating TOC and thickness of different coal measure source rock layers of each well at a target interval, and determining the magnitude of the source rock evaluation parameters of each well, thereby determining a source rock favorable area and further providing a basis for exploration and deployment of coal measure natural gas resources. The validity evaluation standard determined by the invention is combined with a large amount of actually measured data, and the method is reliable and accords with the production result; the quality and the thickness of the source rock are considered while favorable area evaluation parameters are constructed, differences and contributions of different lithologic coal series source rocks are comprehensively considered, the method is more scientific, reasonable and comprehensive, and the application effect is good.

The invention discloses a method for producing hydrogen and methane by injecting carbon dioxide to reinforce anaerobic fermentation of coal-series mud shale, which comprises the following steps: adopting a stainless steel tank as an anaerobic fermentation reactor, adding a coal-series mud shale sample, injecting fermentation liquor containing indigenous flora and exogenous CO2, carrying out a fermentation experiment under the conditions of reservoir temperature and pressure, and regularly taking a gas sample and a liquid sample for detection. The method comprises the following steps of: testing the generation amount of H2 and CH4, calculating the CO2 stage and accumulated utilization amount, analyzing a liquid phase product and a flora structure, analyzing the enhancement effect of exogenous CO2 injection on H2 generation of a fermentation system and the CO2 biological methanation effect, and evaluating the enhancement effect of exogenous CO2 injection on biological methane output of the fermentation system. By adopting the method for injecting the exogenous CO2, the generation of H2 in the anaerobic fermentation system of the coal-series shale can be promoted, the CO2 conversion and the hydrogen nutrition type methane production can be enhanced, the yield of biological methane can be remarkably increased, and an efficient synergistic way is provided for the yield increase of coal-series gas and the resource utilization of CO2.

The invention relates to a coal measure reservoir intelligent inversion method and system for self-adaptive rock physical modeling and a medium The coal measure reservoir intelligent inversion method for self-adaptive rock physical modeling comprises the following steps: self-adaptive rock physical modeling: calculating priority parameters of a rock physical model according to well logging interpretation data, calculating longitudinal and transverse wave speed parameters and density parameters based on the rock physical model corresponding to the highest priority parameter; performing artificial intelligence seismic inversion; obtaining angle elastic impedance data, forming a training set of a neural network by using the angle elastic impedance data and the corresponding longitudinal and transverse wave speed parameters and density parameters, and training a full-connection deep neural network model for reservoir parameter prediction based on the training data set; and obtaining a regression prediction result based on the density of the pre-stack seismic data and a longitudinal and transverse wave velocity ratio parameter based on the elastic impedance data generated based on the pre-stack seismic data. According to the invention, the elastic parameter inversion of the density and the longitudinal-transverse wave velocity ratio is realized.

This invention discloses a method for predicting shear wave transit time in coal-bearing formations using conventional well logging data. The method first determines the shear wave transit time curve data, sonic transit time, density, and natural gamma curve data for coal-bearing formations. Based on the correlation between the shear wave transit time curve and conventional well logging curves for different lithologies, a prediction formula model for shear wave transit time in different lithologies of coal-bearing formations is established. Based on the lithology of the wellbore section of the conventional well logging data to be calculated, a suitable shear wave transit time prediction model is selected for calculation. This invention, by establishing a formula for predicting the shear wave transit time of a work area using conventional well logging data in coal-bearing formations, calculates the shear wave transit time curve of wells without measured dipole sonic imaging logging. This achieves the quantitative acquisition of continuous shear wave transit time parameter profiles using conventional well logging data with good continuity and economic reliability, providing key parameters for calculating the rock mechanical stress and evaluating the fracturing capability of coal-bearing formations.

The utility model discloses a permeability testing device for coal unconventional gas reservoir sample analysis. The permeability testing device comprises a testing box, a testing cavity formed in the testing box, and a receiving box fixed at the bottom of the testing box, the side surface of the test box is provided with a test system which is used for providing a vacuum environment and test gas for the interior of the test cavity and monitoring the gas production rate and the pressure difference after the gas passes through the coal series sample; through cooperation of the translation assembly, the translation plate, the first electric cylinder, the sample plate, the butt joint cylinder and the two opening and closing mechanisms, when coal series samples are taken, placed and replaced, the samples can be taken and placed on the premise that the overall vacuum degree is not damaged, the influence on the vacuum environment of testing is small, complete vacuumizing operation is not needed during continuous testing, and the testing efficiency is improved. The problems of high energy consumption and low test efficiency in a traditional device are solved, and the test process is more continuous and stable, so that the convenience of sample replacement, the stability of a test environment and the high efficiency of test efficiency are realized.

This invention discloses a method for segmented and precise secondary fracturing of horizontal coal-bearing gas wells, belonging to the field of coal-bearing gas extraction technology. The method first identifies the target double-setting segment to be secondary fracturing, then sequentially pumps soluble bridge plugs and a novel bridge plug setting device to form double-setting closed cavities at both ends of the target segment. Fracturing fluid is injected through the wellhead pump, utilizing a piston-linked structure within the device to achieve stroke-type pressurization injection of the fracturing fluid, completing the reservoir stimulation of the target segment. After each segment is completed, the well is shut in and allowed to settle until the soluble components dissolve, at which point the remaining segments are constructed sequentially, and finally, the well is dredged back to resume production. This invention achieves precise positioning, high-volume, high-pressure stimulation of secondary fracturing in horizontal coal-bearing gas wells. The soluble structure eliminates the need for drilling and grinding, resulting in high construction efficiency and strong adaptability. It effectively solves the problems of inaccurate positioning, limited displacement, and poor stimulation effect in existing secondary fracturing technologies, significantly improving the production enhancement effect of secondary fracturing in coal-bearing gas wells.

The invention provides a quantitative evaluation method for contribution of coal-series hydrocarbon source rock exhaust to a gas reservoir under a lifting denudation background, and the quantitative evaluation method comprises the following steps: measuring the methane content and the methane carbon isotope ratio of the coal-series hydrocarbon source rock exhaust; respectively determining the methane content and the methane carbon isotope ratio of the original gas reservoir and the current gas reservoir of the target gas reservoir; and according to the balance principle of methane carbon isotopes in the gas reservoir, establishing a calculation formula of the contribution of the coal hydrocarbon source rock exhaust to the gas reservoir based on the methane content and the carbon isotope mixing ratio, and calculating to obtain the contribution ratio of the hydrocarbon source rock exhaust to the gas reservoir. According to the quantitative evaluation method provided by the invention, the contribution proportion of coal series hydrocarbon source rock exhaust to the gas reservoir under the lifting denudation background is solved based on a material balance principle, quantitative evaluation of gas reservoir contribution is realized, scientific exhaust parameters are provided for large-scale gas gathering basin resource evaluation under the lifting denudation effect, and the method is suitable for large-scale gas gathering basin resource evaluation. The method has important application value in natural gas geology research and exploration.