SECONDARY HYDROCARBON GENERATION OF COAL AND ACCUMULATION OF COALBED METHANE IN THE EAST MARGIN OF THE ORDOS BASIN

The studies of the allocation of tectonics, geotherm and coal metamorphic evolution indicated that to the Late Paleozoic coals in the east margin of the Ordos Basin, the production rate of coalbed methane is observably high and the time of gas generation is relatively centralized within the sections affected by abnormal geotherm of the Yanshan Period magma. The secondary hydrocarbon generation controlled the intensity of gas generation and determined the superior conditions of accumulation and conservation of coalbed methane as well.