Coal Quality Characteristics and Distribution Regularity in Depth of Wangfenggang Minefield, Huainan Mining Area

This paper studied the deep-seat coal seam in Wangfenggang mine Huainan area, and analyzed the characteristics of coal petrology and coal type distribution, then discussed the influences of regional geothermal history and tectonic subsidence history on regional coal metamorphism process. The results show that a series of bituminous coal band including gas coal, 1/3 coking coal, fat coal and lean coal vertically distributing in the deep seated seam (-600m ∼-1200m). The metamorphism developing tend is same with coal seam structural shape. It presents that the tectonic stress on hydrostatic pressure state can affect coal metamorphism process. It was predicted that the metamorphic type of Wangfenggang minefield is superposition from the effect of energy transformation from tectonic stress on hydrostatic pressure state and katogenic metamorphism, which is long term regional extrusion has promoted and controlled coal metamorphism. The study on coal metamorphism on deep seated seam can be very important on coking coal's development in China and also contribute to present metamorphism theory.