Middle-low Rank Coal-series Source Rock Geochemistry Characteristics and Evaluation of Hydrocarbon Generation Potential of Huhehu Depression

Through the methods of organic geochemistry and organic petrology and in combination with the thermal simulation experiment,the hydrocarbon generation potential of coal-series source rock in Huhehu Depression was discussed.The research results showed that the coal-series source rock organic matter abundance in the area was totally in the standard of medium-good hydrocarbon source rock;organic matter type was main of humic type,the microscopic composition was mainly desmocollinite;the most of hydrocarbon source rocks were in middle-low coal rank.Geochemical characteristics of coal and coal-seam mudstone were similar,biomarker compounds displayed that coal was mainly derived from higher plants.A thermal simulation experiment and open system hydrocarbon generation kinetics are studied by using high pressure and high temperature stove and Rock-Eval instrument respectively,the total hydrocarbon production of thermal simulation experiment and hydrocarbon generation potential of pyrolysis is basically the same,and the hydrocarbon generation process reflects that the coal-series source rock having multi stage hydrocarbon generation characteristics,showing the coal-series source rock has great potential of hydrocarbon generation.