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Response of Macromolecular Structure to Deformation in tectonically deformed coal

Acta Geologica Sinica(English Edition) 2013年第1期87卷 82-90页

作者： LI Xiaoshi JU Yiwen HOU Quanlin FAN Junjia Key Laboratory of Computational Geodynamics Chinese Academy of Sciences College of Earth Science University of Chinese Academy of Sciences PetroChina Research Institute of Petroleum Exploration and Development Key Laboratory of Basin Structure and Petroleum Accumulation

The structural evolution of tectonically deformed coals （TDC） with different deformational mechanisms and different deformational intensities are investigated in depth through X-ray diffraction （XRD） analysis on 31 samples of different metamorphic grades （R ： 0.7%-3.1%） collected from the Huaibei coalfield. The results indicated that there are different evolution characteristics between the ductile and brittle deformational coals with increasing of metamorphism and deformation. On the one hand, with the increase of metamorphism, the atomic plane spacing （d002） is decreasing at step velocity, the stacking of the BSU layer （Lc） is increasing at first and then decreasing, but the extension of the BSU layer （La） and the ratio of La/Lc are decreasing initially and then increasing. On the other hand, for the brittle deformational coal, d002 is increasing initially and then decreasing, which causes an inversion of the variation of Lc and La under the lower-middle or higher-middle metamorphism grade when the deformational intensity was increasing. In contrast, in the ductile deformational coals, d002 decreased initially and then increased, and the value of L~ decreased with the increase of deformational intensity. But the value of La increased under the lower-middle metamorphism grade and increased at first and then decreased under the higher-middle metamorphism grade. We conclude that the degradation and polycondensation of TDC macromolecular structure can be obviously impacted during the ductile deformational process, because the increase and accumulation of unit dislocation perhaps transforms the stress into strain energy. Meanwhile, the brittle deformation can transform the stress into frictional heat energy, and promote the metamorphism and degradation as well. It can be concluded that deformation is more important than metamorphism to the differential evolution of the ductile and brittle deformational coals.

关键词： tectonically deformed coal X-ray diffraction deformational mechanism deformationalintensity macromolecular structure

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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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Controls on migration and aggregation for tectonically sensitive elements in tectonically deformed coal:An example from the Haizi mine, Huaibei coalfield, China

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Science China Earth Sciences 2014年第11期57卷 1180-1191页

作者： LI YunBo JIANG Bo QU ZhengHui School of Resource and Earth Science China University of Mining & Technology Key Laboratory of coalbed Methane Resources and Reservoir-Forming Ministry of Education

tectonically deformed coal(TDC)develops because of the superimposed deformation and metamorphism of a coal seam by tectonic *** migration and accumulation of trace elements in TDC is largely in response to stress-strain *** develop a law governing the migration and aggregation of sensitive elements and investigate the geological controls on TDC,coal samples from different deformation sequences were collected from the Haizi mine,in the Huaibei coalfield in Anhui Province,China,and the concentrations of 49 elements were determined by XRF and ICP-MS,and then microscopically *** results show that the distribution and morphology of minerals in coal is related to the deformation degree of *** evolutionary process runs from orderly distribution of minerals in a weak brittle deformed coal to disordered distributions in ductile deformed *** to the elemental distribution characteristics in TDC,four types of element migration can be identified:stable,aggregate,declining,and undulate types,which are closely related to the deformation degree of *** data indicate that the overall distribution of rare earth elements(REE)does not change with metamorphism and deformation,but it shows obvious dynamic differentiation phenomena along with the deformation of *** action after coal-formation,brittle or ductile deformation,and the metamorphic mechanism and its accompanying dynamic thermal effects are the main factors that influence the redistribution of elements in *** conclude that tectonic movements provide the motivation and basis for the redistribution of elements and the paths and modes of element migration are controlled by brittle and ductile deformation metamorphic *** dynamic thermal effect has the most significant effect on coal metamorphism and tectonic-stress-accelerated element migration and *** factors then induce the tectonic-dynamic differentiation phenomenon of element migration.

关键词： tectonically deformed coal sensitive elements migration and aggregation law geological controlling factors Haizi mine

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Influence of combination forms of intact sub-layer and tectonically deformed sub-layer of coal on the gas drainage performance of boreholes: a numerical study

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International Journal of coal Science & Technology 2020年第3期7卷 571-580页

作者： Wei Zhao Kai Wang Rong Zhang Huzi Dong Zhen Lou Fenghua An Beijing Key Laboratory for Precise Mining of Intergrown Energy and Resources China University of Mining&TechnologyBeijingBeijing100083China School of Emergency Management and Safety Engineering China University of Mining&TechnologyBeijingBeijing100083China Flight Technology College Civil Aviation University of ChinaTianjin300300China State Key Laboratory Cultivation Base for Gas Geology and Gas Control(Henan Polytechnic University) Jiaozuo454003China

High concentration and large flow flux of gas drainage from underground coal seams is the precondition of reducing emission and large-scale use of ***,the layered occurrence of coal seams with tectonically deformed sub-layers and intact sub-layers makes it difficult to effectively drain gas through commonly designed *** this study,the gas drainage performance in coal seams with different combinations of tectonically deformed sub-layers and intact sub-layers was numerically *** analysis results show that the gas drainage curve changes from a single-stage line to a dual-stage curve as the permeability ratios of Zone II(kII)and Zone I(kI)increase,raising the difficulty in gas ***,a dual-system pressure decay model based on the first-order kinetic model was developed to describe the dual-stage characteristics of pressure decay curves with different permeability *** the end,the simulation results were verified with reference to in-situ drainage data from *** research results are helpful for mines,especially those with layered coal seams comprising tectonically deformed sub-layers and intact sub-layers,to choose appropriate gas drainage methods and develop the original drainage designs for achieving better gas drainage performance.

关键词： tectonically deformed coal Pressure decay Permeability Hydraulic flushing boreholes

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Geochemistry of Mercury in the Permian tectonically deformed coals from Peigou Mine, Xinmi coalfield, China

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Acta Geologica Sinica(English Edition) 2017年第6期91卷 2243-2254页

作者： SONG Dangyu LI Chunhui SONG Boyi YANG Cunbei LI Yunbo Institute of Resource and Environment Henan Polytechnic University Collaborative Innovation Center of coalbed Methane and Shale Gas for Central Plains Economic Region State Key Laboratory of coal Resoures and Safe Mining China University of Mining and TechnologyBeijing Yanghe coal Industry Zhengzhou Coal Mining Group Co.Ltd.

As the mercury emitted from coal combustion can lead to serious environmental issues, researchers pay more attention to the content, distribution and occurrence of mercury in coal. In this paper, the content, distribution, and occurrence of mercury in the Permian tectonically deformed coals from Peigou Mine, Xinmi coalfield, Henan Province were investigated. A total of 18 bench samples were taken from No.2-1 coals seam in Peigou Mine, including 15 coal bench samples, two roofs and one floor. The mercury concentration, mineral composition, and main inorganic element content of 18 samples were determined by DMA-80 direct mercury analyzer, XRD, and XRF respectively. The results show that the mercury content ranges from 0.047 ppm to 0.643 ppm, with an average of 0.244 ppm. Though the coal seam has turned into typical tectonically deformed coal by the strong tectonic destruction and plastic deformation, the vertical distribution of mercury has remarkable heterogeneity in coal seam section. By the analysis of correlation between mercury and the main inorganic elements and the mineral composition in coal, we infer that majority of mercury mainly relates to pyrite or kaolinite.

关键词： mercury in coal minerals in coal tectonically deformed coal modes of occurrence

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Structure and coalbed methane occurrence in tectonically deformed coals

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Science China Earth Sciences 2012年第10期55卷 1755-1763页

作者： HOU QuanLin LI HuiJun FAN JunJia JU YiWen WANG TianKai LI XiaoShi WU YuDong Key Laboratory of Computational Geodynamics CASCollege of Earth ScienceGraduate University of Chinese Academy of SciencesBeijing 100049China Research Institute of Petroleum Exploration & Development State Key laboratory of Enhanced Oil RecoveryRIPED Petro ChinaBeijing 100083China Institute of Mineral Resources Chinese Academy of Geological SciencesBeijing 100037China

Research on structure of tectonically deformed coals(TDC) is a key issue in coal and gas outburst prevention and coalbed methane(CBM) *** paper presents a summary on the research progress in TDC's structural-genetic classification,tectonic strain influence on coal microstructure,coal porosity system,coal chemical structure and constituents,and their relationship with the excess coalbed *** studies suggested that tectonic deformation had significant influence on coal microstructure,coal super microstructure,and even chemical macromolecular *** main mechanisms of coal deformation are the tectonic stress degradation and polycondensation metamorphism(dynamical metamorphism).Besides,under different deformation mechanisms,the ultra-and micro-structure and chemical constituents of TDC presented distinct *** on these achievements,we propose one possible evolutionary trend of TDC with different deformation mechanisms,and suggest that the coal and gas outburst in the TDC,especially in the mylonitic coals,may be not only controlled by geological structure,but also influenced by the tectonic stress degradation of ductile ***,further study on TDC should be focused on the controlling mechanism of deformation on structure and composition of coal,generation conditions and occurrence state of excess coalbed methane from deformation mechanism of coal.

关键词： tectonically deformed coal deformation mechanism coalbed methane occurrence research progress

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Structural Controls on coalbed Methane Reservoirs in Faer coal Mine, Southwest China

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Journal of Earth Science 2013年第3期24卷 437-448页

作者：李明姜波林寿发兰凤娟汪吉林 School of Resource and Earth Science China University of Mining and Technology Department of Earth and Environmental Sciences University of Waterloo School of Resource and Earth Science China University of Mining and Technology Key Laboratory of coalbed Methane Resource and Reservoir Formation Process Ministry of EducationChina University of Mining and Technology

Guizhou （贵州） Province, Southwest China, is rich in coalbed methane （CBM） resources, wherein its geological structure is complicated. We discuss the occurrence characteristics of CBM based on CBM borehole test data and geological setting. In combination with the analysis of the regional tectonics, macro-and micro-scopic geological structures and pore size distributions, the structural controls on CBM reservoirs were further discussed from the aspects involving tectonic evolution, structural features, and deformation of coal. The results show that the CBM enrichment was mainly controlled by the regional tectonic subsidence and weak structural deformation on coal reservoirs after coal formation. The Yangmeishu （杨梅树） syncline and topography are the main controlling factors to the current distribution pattern of CBM, which is higher in the north than the south and trending toward the NE direction. Normal faults and fractures can be divided into open, closed, and occluded types. The open type reduces both gas content and methane concentration of nearby coal seams. The closed type causes the decrease of gas content, while methane concentration is still high. The occluded type fail to reduces gas content, and even results in the enrichment of CBM in small areas near fault. Moderate brittle deformation can improve the pore structure and development of structural fracture of coal *** structural coals with well-developed fractures and relatively uniformly distributed pore structures are common in the Faer （发耳） coal mine, which are favorable for the production of CBM.

关键词： coalbed methane structure fault tectonically deformed coal Faer coal mine.

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