Analysis on thermal history of coal strata of typical mining areas in western Guizhou and eastern Yunnan

Based on the systematic study on tectonic characteristics, coal-bearing strata development and heating background in western Guizhou and eastern Yunnan, this paper uses basin modeling technology to expound the burial history and heat evolution history and to reveal the episodic of the maturation and evolution of coal-bearing strata in Gemudi syncline and Enhong basin.The results show that the coal metamorphism is mainly controlled by deposition depth, magmatic hydrothermal fluids, tectonics and some other factors.Thus, the coal metamorphism is very uneven.The coal-bearing strata are separated into a number of independent sub-syncline units, which have a structural feature of syncline-controlled gas.It is in coking coal-lean coal phase of the late Permian coal in Gemudi syncline, of which R_o is about 1.7%, whereas, it is in gas coal-fat coal phase in Enhong basin, of which R_o is about 1.0%.