The thickness of overlaying bedrock is the main control factor of preservation, in addition, magmatic activities, different structural types and hydrogeological conditions are also control factors. Regional magmatic thermometamorphism appeared as a kind of superimposed effect on the background of deep metamorphism. Two Eastwest (EW)metamorphic belts in Shanxi tallied with the distribution of magmatic rock masses, resulting in coal seam gas exploitation and utilization bases of Yangquan and Jincheng mining areas. From gas-accumulation structural setting, closed type structures make high gas content in coal reservoir such as Qinnan, Gujiao, Xingjiashe, Dongshe areas in the Qinshui Basin, Shilou, Daning-Jixian and Sanjiao-Liulin areas in the Hedong Basin, gas content is 10-15 m³/t or even higher. There are convenient channels for coal seam gas effusion in the open structures; with lower gas content, such as Lishi mining area in Hedong Basin, Huoxi structural area in Qinshui Basin, Hunyuan, and Wutai coal districts.
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