Analysis of conditions for the formation of a coal methane accumulation in the Qinshui coal methane field

Abstract：Coal beds in the Qinshui coal methane field vary in thickness between 1 and 2 m, being generally 6 m thick. The degree of thermal maturity Ro ranges from 2.6% to 3.7% and the coal methane resources are abundant with a gas content of > 14 m3/t. The components and carbon isotopic composition of coal methane suggest that the coal methane of thermal origin in the Qinshui coal methane underwent deadsorption, diffusion and migration, it was concentrated and accumulated in the structural high, and the coal methane accumulation has been well preserved after its formation. Owing to the above-mentioned three factors, coal methane in the Qinshui coal methane field has good conditions of accumulation formation.