Mechanism of stepwise tectonic control on gas occurrence: A study in North China  

作　　者：Jia Tianrang Zhang Zimin Wei Guoying Tang Chun'an 

机构地区：[1]School of Civil Engineering, Dalian University of Technology [2]College of Safety Science and Engineering, Henan Polytechnic University [3]State Key Laboratory Cultivation Base for Gas Geology and Gas Control, Henan Polytechnic University

出　　处：《International Journal of Mining Science and Technology》2015年第4期601-606,共6页矿业科学技术学报（英文版）

基　　金：financially supported by the Major Project of National Science and Technology of China(No.2011ZX05040-005);the Key Program of National Natural Science Foundation of China(No.51234005);the National Natural Science Foundation of China(No.41102094);the Changjiang Scholars and Innovative Research Team in University of China(No.IRT1235)

摘　　要：To gain an understanding of gas occurrence, distribution is the fundamental basis for preventing gas disasters. Presently, how tectonic structures control gas occurrence remains problematic. This study proposes the theory and elucidates the mechanism of stepwise tectonic control on gas occurrence according to the characteristics of gas occurrence and the patterns of gas distribution in coal mines in North China. On the one hand, tectonic compression and shearing lead to stress concentration and thus deform the coal and reduce the coal seam permeability, further contributing to gas preservation. On the other hand, tectonic extension and rifting lead to stress release and thus improve the coal seam permeability, further contributing to gas emission. Therefore, the distribution zones of tectonic compression, ubiquitous coal deformation, and gas accumulation have been step-wisely revealed, and the coal-gas outburst proneness zones are finally identified. The proposed theory of step-wise tectonic control on gas occurrence is of practical significance for gas prediction and control.To gain an understanding of gas occurrence, distribution is the fundamental basis for preventing gas disasters. Presently, how tectonic structures control gas occurrence remains problematic. This study proposes the theory and elucidates the mechanism of stepwise tectonic control on gas occurrence according to the characteristics of gas occurrence and the patterns of gas distribution in coal mines in North China. On the one hand, tectonic compression and shearing lead to stress concentration and thus deform the coal and reduce the coal seam permeability, further contributing to gas preservation. On the other hand, tectonic extension and rifting lead to stress release and thus improve the coal seam permeability, further contributing to gas emission. Therefore, the distribution zones of tectonic compression, ubiquitous coal deformation, and gas accumulation have been step-wisely revealed, and the coal-gas outburst proneness zones are finally identified. The proposed theory of step-wise tectonic control on gas occurrence is of practical significance for gas prediction and control.

关 键 词：Gas occurrence Geological structure Stepwise control Tectonic evolution 

分 类 号：TD712.2[矿业工程—矿井通风与安全]