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Geological modeling of coalbed methane reservoirs in the tectonically deformed coal seam group in the Dahebian block,western Guizhou,China

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Frontiers of Earth Science 2024年第1期18卷 44-67页

作者： Yong SHU shuxun sang Xiaozhi ZHOU Key Laboratory of Coalbed Methane Resources and Reservoir Formation Process(Ministry of Education) China University of Mining and TechnologyXuzhou 221116China Carbon Neutrality Institute China University of Mining and TechnologyXuzhou 221008China School of Resources and Geosciences China University of Mining and TechnologyXuzhou 221116China Jiangsu Key Laboratory of Coal-based Greenhouse Gas Control and Utilization China University of Mining and TechnologyXuzhou 221008China

The widely spread Carboniferous-Permian coal seam group in southern China has great potential for coalbed methane resources,but the extensively developed tectonically deformed coal seriously restricts its *** the Dahebian block in western Guizhou as the study area,the geological model of coalbed methane reservoirs in the tectonically deformed coal seam group was established,and the spatial distribution pattern of model parameters was clarified by clustering algorithms and factor *** facies model suggests that the main coal body structures in Nos.1,4,and 7 coal seams are cataclastic coal and granulated coal,whereas the No.11 coal seam is dominated by granulated coal,which has larger thicknesses and spreads more *** in situ permeability of primary undeformed coal,cataclastic coal,granulated coal,and mylonitized coal reservoirs are 0.333 mD,0.931 mD,0.146 mD,and 0.099 mD,respectively,according to the production performance analysis *** property model constructed by facies-controlled modeling reveals that Nos.1,4,and 7 coal seams have a wider high-permeability area,but the gas content is lower;the high-permeability area in the No.11 coal seam is more limited,but the gas content is *** results of the self-organizing map neural network and K-means clustering indicate that the geological model can be divided into 6 clusters,the model parameter characteristics of the 6 clusters are summarized by data analysis in combination with 6 factors extracted by factor analysis,and the application of data analysis results in multi-layer coalbed methane co-development is *** study provides ideas for the geological modeling in the tectonically deformed coal seam group and its data analysis.

关键词： geological modeling tectonically deformed coal coal seam group clustering algorithm Dahebian block,western Guizhou

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Production Characteristics and the Control Factors of Surface Wells for Relieved Methane Drainage in the Huainan Mining Area

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Acta Geologica Sinica(English Edition) 2011年第4期85卷 932-941页

作者： XU Hongjie sang shuxun FANG Liangcai HUANG Huazhou School of Resources and Geoscience China University of Mining and TechnologyKey laboratory of CBM Resource and Reservoir-Generating ProcessesChina Ministry of EducationXuzhou 221008China Huainan Mining Group Huainan 232001China

Based on the production data of a large number of surface drainage wells in the Huainan mining area,the present study shows that four types of typical production characteristics for relieved methane wells are recognized,of which the stable type for production and gas concentration is the most dominate,as determined by a comprehensive study on the volume and concentration of drained gases, as well as the stress changes of rocks influenced by *** influence factors for the productive differences of the drainage wells were also been *** results indicate that protective coal-seam mining has a significant effect on overlying strata,which promotes the development of pores and fractures of coal reservoirs for methane desorption and migration;however,the production and the stability of drainage wells are affected by deformation and damage of the overlying *** second distribution of strata stress is caused by mining engineering,and if the stress load is larger than the carrying capacity of the extraction well,the gas production would be influenced by the drainage well that has been damaged by rock ***,the case damage occurs first in the weak, lithologic interface by its special mechanical *** stability of drainage wells and the production status are also influenced by the different drilling techniques,uneven distribution of gas concentration,and combination of gob gas and methane from the protected layer.

关键词： relieved methane surface drainage well Huainan mining area production characteristic control factor

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Effect of permeability and its horizontal anisotropy on enhanced coalbed methane recovery with CO_(2) storage:quantitative evaluation based on staged CH_(4) output inhibition

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Frontiers of Earth Science 2023年第3期17卷 856-866页

作者： Ziliang WANG shuxun sang Xiaozhi ZHOU Xudong LIU Shouren ZHANG Key Laboratory of Coalbed Methane Resources&Reservior Formation Process(Ministry of Education) China University of Mining and TechnologyXuzhou 221008China School of Resources and Geosciences China University of Mining and TechnologyXuzhou 221008China Carbon Neutrality Institute China University of Mining and TechnologyXuzhou 221008China Jiangsu Key Laboratory of Coal-Based Greenhouse Gas Control and Utilization Xuzhou 221008China China United Coalbed Methane Co.Ltd.(CUCBM) Beijing 100011China

The permeability and its horizontal anisotropy induce a critical influence on staged CH_(4) output inhibition ***,a quantitative evaluation of this influence has been rarely reported in the *** this work,the impact of horizontal anisotropic permeability on CO_(2)-ECBM was numerically *** variation in the staged CH_(4) output inhibition was *** ideal displacement profile of the CO_(2)-ECBM process was established for the first ***,the variation in CH_(4) output of different wellbores was *** results showed that 1)low-permeable or weak-anisotropic reservoirs were not conducive to enhanced CH_(4) recovery owing to long inhibition time(>1091 days)and high inhibition level(>36.9%).As permeability and anisotropy increased,due to the accelerated seepage of free water,the hysteresis time and inhibition time could decrease to as short as 5 days and 87 days,respectively,and the inhibition level could weaken to as low as 5.00%.Additionally,the CH_(4) output and CO_(2) injection could increase significantly.2)Nevertheless,high permeability and strong anisotropy easily induced CO_(2) breakthrough,resulting in lower CH_(4) production,CO_(2) injection and CO_(2) storage than *** maintaining high efficiency of CO_(2) storage(>99%),upregulating CO_(2) breakthrough concentration from 10%to 20%might ease the unfavorable trend.3)Along the direction of fluid flow,the ideal displacement profile consisted of CO_(2) enriched bank,CO_(2) and CH_(4) mixed bank,CH_(4) enriched bank,and water enriched bank,whereas a remarkable gap in the displacement profiles of the dominant and non-dominant seepage directions was observed.4)The potential of CH_(4) output might vary greatly among different *** producers along the dominant seepage direction held more potential for CH_(4) recovery in the short-term,while those along the non-dominant seepage direction avoided becoming invalid only if a long-time injection measure

关键词： CO_(2)-ECBM permeability anisotropy the staged CH_(4)output inhibition displacement profile

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Carboniferous tectono-magmatic evolution of the northern Luliang arc: evidence from geochemistry and petrography of Carboniferous volcanic rocks in the northern Luliang Uplift,NW China

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Acta Geochimica 2021年第4期40卷 602-622页

作者： Sijie Han shuxun sang Wenfeng Wang Jinchao Zhang Guanlong Zhang Low Carbon Energy Research Institute China University of Mining and TechnologyXuzhou 221008China Key Laboratory of Coalbed Methane Resources and Reservoir Formation Process of the Ministry of Education China University of Mining and TechnologyXuzhou 221008China School of Resource and Earth Sciences China University of Mining and TechnologyXuzhou 221116China Research Institute of Petroleum Exploration and Development Shengli Oilfield CompanyDongying 257000China

The Northern Junggar Basin experienced extensive subduction and a complex tectono-magmatic evolution during the Late Paleozoic,resulting in a heterogeneous distribution of volcanic rocks in the Junggar *** this study,the Carboniferous tectono-magmatic evolution of the northern Luliang arc was described by exploring the petrography and geochemistry of Carboniferous volcanic rocks collected from well Y-2 and outcrop WW' in the northern Luliang *** distribution,types,and formation ages of these volcanic rocks were characterized and the volcanic sequence in well Y-1 was divided into upper and lower parts according to vertical variations in selected geochemical *** the petrogenesis and tectonic settings of different volcanic rocks were evaluated and this was used to infer the tectonomagmatic evolution of the northern Luliang arc during the *** results indicate that:(1) Carboniferous high-K calc-alkali andesite-dacite associations are distributed in the west of the northern Luliang Uplift,and Lower Carboniferous calc-alkali basalt-dacite-rhyolite assemblages are preserved in its east.(2) The intermediateacid volcanic rocks in wells Y-1 and Y-2 were derived from calc-alkali basaltic magma through melting of the juvenile lower crust,and geochemical variations indicate increasing addition of slab melting in a subduction-related arc *** bimodal volcanic rocks from outcrop WW' were derived from lithospheric underplating of basaltic magma in an intra-arc extensional setting.(3) The closure of the eastern Keramaili Oceanic basin occurred before the Early Carboniferous,and the tectono-magmatic difference between the east and the west of the northern Luliang Uplift appeared before the Carboniferous period.

关键词： Tectonic setting Bimodal volcanic rocks Carboniferous Keramaili oceanic basin Subduction Northern Luliang arc

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Assessment of CO_(2)geological storage capacity based on adsorption isothermal experiments at various temperatures:A case study of No.3 coal in the Qinshui Basin

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Petroleum 2023年第2期9卷 274-284页

作者： Sijie Han shuxun sang Jinchao Zhang Wenxin Xiang Ang Xu Jiangsu Key Laboratory of Coal-based Greenhouse Gas Control and Utilization China University of Mining and TechnologyXuzhou221008China Carbon Neutrality Institute China University of Mining and TechnologyXuzhou221008China School of Resources and Earth Sciences China University of Mining and TechnologyXuzhou221116China

Carbon dioxide(CO_(2))capture,utilization,and storage(CCUS)is an important pathway for China to achieve its“2060 carbon neutrality”*** sequestration of CO_(2)in deep coals is one of the methods of ***,the No.3 anthracite in the Qinshui Basin was studied using the superposition of each CO_(2)geological storage category to construct models for theoretical CO_(2)geological storage capacity(TCGSC)assessment,and CO_(2)adsorption capacity variation with ***_(2)geological storage potential of No.3 anthracite coal was assessed by integrating the adsorption capacity with the static storage and dissolution *** results show that(1)CO_(2)adsorption capacities of XJ and SH coals initially increased with depth,peaked at 47.7 cm3/g and 41.5 cm3/g around 1000 m,and later decreased with depth.(2)four assessment areas and their geological model parameters were established based on CO_(2)phase variation and spatial distribution of coal thickness,(3)the abundance of CO_(2)geological storage capacity(ACGSC),which averages 40 cm3/g,shows an analogous circularity-sharp distribution,with the high abundance area influenced by depth and coal rank,and(4)the TCGSC and the effective CO_(2)geological storage capacity(ECGSC)are 9.72 Gt and 6.54 Gt;the gas subcritical area accounted for 76.41%of the total *** adsorption-related storage capacity accounted for more than 90%of total TCGSC,its proportion,however,decreased with *** CO_(2)-ECBM project should focus on highrank coals in gas subcritical and gas-like supercritical *** research will provide significant reference for assessment of CO_(2)geological storage capacity in deep coals.

关键词： CO_(2)geological storage in coal Theoretical geological storage capacity The abundance of CO_(2)geological storage capacity Anthracite Qinshui basin

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Simulation of Paleotectonic Stress Fields and Distribution Prediction of Tectonic Fractures at the Hudi Coal Mine, Qinshui Basin

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Acta Geologica Sinica(English Edition) 2017年第6期91卷 2007-2023页

作者： FANG Huihuang sang shuxun WANG Jilin LIU Shiqi JU Wei Key Laboratory of Coalbed Methane Resources and Reservoir Formation Process of the Ministry of Education China University of Mining and Technology School of Resources and Geosciences China University of Mining and Technology Low Carbon Energy Institute China University of Mining and Technology The Key Laboratory of Coal-based CO2 Capture and Geological Storage Jiangsu ProvinceChina University of Mining and Technology

Study on tectonic fractures based on the inversion of tectonic stress fields is an effective method. In this study, a geological model was set up based on geological data from the Hudi Coal Mine, Qinshui Basin, a mechanical model was established under the condition of rock mechanics and geostress, and the finite element method was used to simulate the paleotectonic stress field. Based on the Griffith and Mohr-Coulomb criterion, the distribution of tectonic fractures in the Shanxi Formation during the Indosinian, Yanshanian, and Himalayan period can be predicted with the index of comprehensive rupture rate. The results show that the acting force of the Pacific Plate and the India Plate to the North China Plate formed the direction of principal stress is N-S, NW - SE, and NE - SW, respectively, in different periods in the study area. Changes in the direction and strength of the acting force led to the regional gradients of tectonic stress magnitude, which resulted in an asymmetrical distribution state of the stress conditions in different periods. It is suggested that the low-stress areas are mainly located in the fault zones and extend along the direction of the fault zones. Furthermore, the high-stress areas are located in the junction of fold belts and the binding site of multiple folds. The development of tectonic fractures was affected by the distribution of stress intensity and the tectonic position of folds and faults, which resulted in some developed areas with level I and II. There are obvious differences in the development of tectonic fractures in the fold and fault zones and the anticline and syncline structure at the same fold zones. The tectonic fractures of the Shanxi Formation during the Himalayan period are more developed than those during the Indosinian and Yanshanian period due to the superposition of the late tectonic movement to the early tectonic movement and the differences in the magnitude and direction of stress intensity.

关键词： tectonic fracture paleotectonic stress field comprehensive rupture rate numerical simulation Hudi Coal Mine Qinshui Basin

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Experimental study on the deformation behaviour,energy evolution law and failure mechanism of tectonic coal subjected to cyclic loads

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International Journal of Mining Science and Technology 2022年第6期32卷 1301-1313页

作者： Deyi Gao shuxun sang Shiqi Liu Jian Wu Jishi Geng Wang Tao Tengmin Sun Key Laboratory of Coalbed Methane Resources and Reservoir Formation Process China University of Mining and TechnologyXuzhou 221116China School of Resources and Geosciences China University of Mining and TechnologyXuzhou 221116China Carbon Neutrality Institute China University of Mining and TechnologyXuzhou 221116China Jiangsu Key Laboratory of Coal-based Greenhouse Gas Control and Utilization China University of Mining and TechnologyXuzhou 221116China China United Coalbed Methane Co.Ltd.(CUCBM) Beijing 100083China

Compared to intact coal,tectonic coal exhibits unique *** deformation behaviours under cyclic loading with different confining pressures and loading rates are monitored by MTS815 test system,and the mechanical and energy properties are analysed using experimental *** results show that the stress-strain curve could be divided into four stages in a single *** elastic strain and elastic energy density increase linearly with deviatoric stress and are proportional to the confining pressure and loading rate;irreversible strain and dissipated energy density increase exponentially with deviatoric stress,inversely proportional to the confining pressure and loading *** internal structure of tectonic coal is divided into three types,all of which are damaged under different deviatoric stress levels,thereby explaining the segmentation phenomenon of stress-strain curve of tectonic coal in the cyclic loading *** coal exhibits nonlinear energy storage characteristics,which verifies why the tectonic coal is prone to coal and gas outburst from the principle of energy *** addition,the damage mechanism of tectonic coal is described from the point of energy distribution by introducing the concepts of crushing energy and friction energy.

关键词： Tectonic coal Cyclic loading Deformation behaviour Energy evolution Failure mechanism

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Determination of representative elementary volume of digital coal based on fractal theory with X-ray CT data and its application in fractal permeability predication model

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Frontiers of Earth Science 2022年第3期16卷 657-670页

作者： Huihuang FANG shuxun sang Shiqi LIU Huihu LIU Hongjie XU Yanhui HUANG School of Earth and Environment Anhui University of Science and TechnologyHuainan 232001China Institute of Energy Hefei Comprehensive National Science CenterHefei 230000China Low Carbon Energy Institute China University of Mining and TechnologyXuzhou 221008China School of Resources and Geosciences China University of Mining and TechnologyXuzhou 221116China Jiangsu Key Laboratory of Coal-based Greenhouse Gas Control and Utilization China University of Mining and TechnologyXuzhou 221008China State Key Laboratory of Petroleum Resources and Prospecting China University of PetroleumBeijing 102249China

Representative elementary volume(REV)is the key to study the heterogeneity of digital coal and characterize its macroscopic and microscopic *** permeability evolution law of digital coal based on REV analysis can provide theoretical support for the application of permeability prediction model in multi-scale *** study takes typical coal samples from Bofang and Sihe coal mines in Qinshui Basin as research ***,the nondestructive information of two samples is scanned and ***,the calculation methods of two-dimensional(2D)and threedimensional(3D)fractal dimensions of pores and fractures are ***,the determination methods of REV based on porosity and fractal dimension are ***,the distribution pattern of fractal dimension and porosity curves is studied,the relationship between 2D and 3D fractal dimension is characterized,and the application of fractal permeability model in permeability analysis of multi-scale reservoir is further *** REV size varies greatly in different vertex directions of the same sample and between samples,so REV analysis can only be performed in specific *** the REV based on fractal dimension is determined,the porosity curve continues to maintain a downward trend and then tends to be *** 2D fractal dimension has a positive linear correlation with the 3D fractal dimension,and the porosity can be expressed as a linear function of the fractal *** permeability through REV analysis domain is mainly affected by fractal dimension,dip angle,azimuth angle and maximum fracture length,which is of great significance for exploring permeability evolution law of coal reservoir at different *** study is of great significance for enriching the determination methods of REV in digital coal and exploring the permeability evolution law of multi-scale reservoirs.

关键词： representative elementary volume fractal dimension permeability digital coal X-ray CT Qinshui Basin

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3D reconstruction of coal pore network and its application in CO_(2)-ECBM process simulation at laboratory scale

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Frontiers of Earth Science 2022年第2期16卷 523-539页

作者： Huihuang FANG Hongjie XU shuxun sang Shiqi Liu Shuailiang SONG Huihu LIU State Key Laboratory of Mining Response and Disaster Prevention and Control in Deep Coal Mines Anhui University of Science and TechnologyHuainan 232001China School of Earth and Environment Anhui University of Science and TechnologyHuainan 232001China Institute of Energy Hefei Comprehensive National Science CenterHefei 230000China Jiangsu Key Laboratory of Coal-based Greenhouse Gas Control and Utilization China University of Mining and TechnologyXuzhou 221008China Low Carbon Energy Institute China University of Mining and TechnologyXuzhou 221008China Shandong Provincial Lunan Geo-engineering Exploration Institute Jining 272100China

Three-dimensional(3D)reconstruction of the equivalent pore network model(PNM)using X-ray computed tomography(CT)data are of significance for studying the CO_(2)-enhanced coalbed methane recovery(CO_(2)-ECBM).The docking among X-ray CT technology,MATLAB,with COMSOL software not only can realize the 3D reconstruction of PNM,but also the CO_(2)-ECBM process *** results show that the Median filtering algorithm enabled the de-noising of the original 2D CT slices,the image segmentation of all slices was realized based on the selected threshold,and the PNM can be constructed based on the Maximum Sphere *** mathematical model of CO_(2)-ECBM process fully coupled the expanded Langmuir *** the same time for CO_(2)injection,CH_(4)pressure tends to decrease with the increase of CO_(2)pressure,but its difference is not *** CH_(4)pressure in the slice center changed a lot,while at the edge it changed a little under different CO_(2)*** injected CO_(2)was transported to matrix along the macro and micro-fractures with continuous *** injected CO_(2)first replaced the adsorbed CH_(4)by covering the inner surface of macro-pores and meso-pores to form the single molecular layer adsorption of CO_(2).Then they migrated to micro-pores by Fick’s diffusion,sliding flow,and surface ***,the CO_(2)replaced CH_(4)adsorbed by volumetric filling in micro-pores,and formed the multi-molecular layer adsorption of CO_(2).The gas pressure and migration path between CO_(2)and CH_(4)are *** study can provide a theoretical basis for studying digital rock physics technology and enrich the development of CO_(2)-ECBM technology.

关键词： CO_(2)-ECBM 3D reconstruction numerical simulation X-ray CT COMSOL Qinshui Basin

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Hydrocarbon Generation Evolution of Permo-Carboniferous Rocks of the Bohai Bay Basin in China

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Acta Geologica Sinica(English Edition) 2010年第2期84卷 370-381页

作者： ZHU Yanming QIN Yong sang shuxun CHEN Shangbin LAN Xiaodong Coalbed Methane Resources and Reservoir Formation Process Key Laboratory of Ministry of Education China University of Mining and Technology Xuzhou Jiangsu 221008 China College of Resource and Geoscience China University of Mining and Technology Xuzhou Jiangsu 221116 China

The Bohai Bay Basin is a Mesozoic subsidence and Cenozoic rift basin in the North China Craton. Since the deposition of the Permo-Carboniferous hydrocarbon source rock, the basin has undergone many tectonic events. The source rocks have undergone non-uniform uplift, twisting, deep burying, and magmatism and that led to an interrupted or stepwise during the evolution of hydrocarbon source rocks. We have investigated the Permo-Carboniferous hydrocarbon source rocks history of burying, heating, and hydrocarbon generation, not only on the basis of tectonic disturbance and deeply buried but also with new studies on apatite fission track analysis, fluid inclusion measurements, and the application of the numerical simulation of EASY % Ro. The heating temperature of the source rocks continued to rise from the Indosinian to Himalayan stage and reached a maximum at the Late Himalayan. This led to the stepwise increases during organic maturation and multiple stages of hydrocarbon generation. The study delineated the tectonic stages, the intensity of hydrocarbon generation and spatial and temporal distribution of hydrocarbon generations. The hydrocarbon generation occurred during the Indosinian, Yanshanian, and particularly Late Himalayan. The hydrocarbon generation during the late Himalayan stage is the most important one for the Permo-Carboniferous source rocks of the Bohai Bay Basin in China.

关键词： Permo-Carboniferous source rocks burial history thermal history hydrocarbon generation EASY % Ro numerical simulation Bohai Bay basin

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