| This paper aims at studying the 8 coal seam as the research object in Xin'an minefield Shuangyashan coalfield.Using geological evolution and tectonic gradual control theory, minfield characteristics and tectonic evolution to the control structure of the gas occurrence is analyzed. According to the collected gas-geology data, the structural characteristics of Xin'an minefield and geological tectonics and magmatic activity relationship has been studied, analyzing effects of magmatic activity to the coal seams, The degree of coal metamorphism and gas occurrence. Xin'an mine gas distribution law is affected by the joint effect of geological structure and magmatic activity. Jilin and Heilongjiang fold system controls Shuangyashan Mining compression shear structures, the distribution of deformed coal, and mainly show the EW fabric. magmatic activity has been intense in eastern Heilongjiang and Shuangyashan coalfield since yanshan period, Magmatic thermal metamorphism makes coal seam coal rank higher , uneven seam gas occurrence is caused by uneven magmatism. Magma intrused coal controlhe distribution of the degree of coal metamorphism. Coal from the magma closer, coal metamorphic grade increased, the greater the amount of coal gas adsorption. At the same time, due to the blocking role bedrock and the rock wall,the area is help to the preservation of gas, and gas content and gas emission significantly increased in the magma intrusion area. Magmatic activity directly affect the gas generation, storage and transport. Using the gray correlation analysis and multiple regression analysis to the impact of various geological factors on gas occurrence in quantitative and qualitative analysis, in which,Magmatic activity and burial depth of coal seam are the controlling factors to gas occurrence of Xin'an minefield. Coal and gas outburst danger zone is mainly distributed in the southern thrust fault nearby, the eastern syncline axis and the regional of magma intrusion. |
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