Assessing on Source Rocks in Jurassic Coal Measure and Study on Hydrocarbon Generation Mechanism in Yanqi Basin

Based on the geochemical analysis of dark argillite ,carbonaceous mudstone and crude oil samples, the tectonic and sedimentary characteristics has als o been studied. The type of source rocks, organic maceral constituent of coal me asure source rocks, hydrocarbon generation mechanism and organic abundance, type and maturity characteristics have been analyzed. The result shows that the type of source rocks are typical humics and the coal measure argillite,carbonaceous mudstone and coal of Badaowan Formation, Sangonghe Formation and Xishanyao For mation could produce hydrocarbon, especially in Badaowan and it is the main sour ce rocks. There existed the processes of hydrocarbon formation in both south sag and north sag in Bohu depression. One stage of hydrocarbon generation existed i n south sag and two stages in north sag.