Discussion on thermal evolution and secondary hydrocarbon generation of organic matter from Upper Paleozoic coal measures in Huabei area

Based on over two thousands of vitrinite reflectance(R)data from actual measurements and previous research results,it is systematically discussed that the characteristics of thermal evolution,stages of hydrocarbon generation and evolution,as well as the conditions of secondary hydrocarbon generation in Upper Paleozoic coal measures in Huabei area.The distribution range of secondary hydrocarbon generation in Huabei area is also determined.