GEOLOGICAL FEATURES OF THE DEEP COAL BED IN THE HUXIANG COALFIELD AND ITS IMPACT ON THE OCCURRENCE OF GAS

The Huxiang coalfield is a newly found large coal reserves base in Henan Province. Exploration reveals that, the coal measure strata of Lower Permian Shanxi formation (the second coal formation) occur in 960 to 1400 m below the surface, with two layers of medium to thick coal seams, belonging to peranthracite, lean coal and coke. Because the coal beds in the area are deeply buried, and well closed, a large number of gas is preserved in the coal seam and enriched in the whole area. The analysis on the geological features of deep coal seam and gas occurrence in the Huxiang coalfield will provide basic information for further study on the accumulation conditions and occurrence of gas.