1.College of Geology and Environment,Xi’an University of Science and Technology,Xi’an ,China; 2.Key Laboratory of Coal Resources Exploration and Comprehensive Utilization,Ministry of Land and Resources,Xi’an ,China;3.Shaanxi Coal Geology Group Co.,Ltd.,Xi’an ,China

The tectonics effect on coalbed methane distributions is a scientific challenge in evaluation of extraction potential ability of coalbed methane.To study the distributions of coalbed methane around tectonic settings in coal seams,we select No.1 panel of Guojiahe coal mine as the research background.Detailed tectonic features and geotectonic distributions in No.1 panel have been explored by three-dimensional seismic exploration survey and multi-properties fusion methods.Then,a numerical model was built considering coupled thermal-hydraulic-mechanical model to reveal the tectonic setting such as anticlines,faults and anticline effect on coalbed methane density,pressure,temperature and permeability distribution.The results show that the density,pressure,temperature,and permeability near axis of syncline in thick coal seams are significantly high by using the thermal-hydraulic-mechanical model.Original compressive stress maintains the stress for coalbed methane preserving at 106 Pa with non-diffusion conditions.The tension stress is unfavorable for gas preservation and the gas pressure near the fault is various because faults induced by tensional force may provide diffusion channels for gas.Ten synclines in thick coal seam were found using three-dimensional seismic exploration survey in Guojiahe coal mine.According to the gas content distribution under tectonic settings,Xn1 syncline axis section at the eastern side of No.1310 mining face and B6 anticline wing section at the middle of No.1309 mining face are considered as favorable extraction areas.

国土资源部煤炭资源勘查与综合利用重点实验室开放课题资助项目(KF2018-1)；国土资源部煤炭资源勘查与综合利用重点实验室开自主重点资助项目（2019-ZDZX-1）