Jimsar Depression Reservoir Geochemical Studies

Associated with the study of lighter hydrocarbon constituent, carbon isotope, biomarker and inclusions, adopted the technique of oil source correlation on whole oil samples, it can be confirmed that the hydrocarbon source of viscous crude in Permian, in the east slope of Jimusaer depression, is Pingdiquan Formation mudstone; Carboniferous oil comes from Carboniferous source rock. Meanwhile, the causes of oil formation are investigated based on datum of Reservior Geochemistry: Viscous crude of Permian is the result of biodegradation and low maturity working together, and that lighter hydrocarbon constituent of Carboniferous oil is missing. At last, the mode and mechanism of the oil pool formation are analysed in the study area according to the structure phylogeny, sedimentary history, and data of Reservior Geochemistry. I also generalize the principles of oil distribution in Jimusaer depression. Bitumen precipitation and viscous crude with lithology form sealing layers together. So it is hope to find gently-biodegradation-oil of Pingdiquan Formation at declination direction of slope.The paper also points out the next aspect of exploration. East-slope of Jimusaer Depression and the dropped side of Jimusaer rupture are the next advantageous aspect of exploration. Main stratums of exploration are Permian and Carboniferous. Intermediate zones of east-slope are in the way of oil travel and favorable territory oil moving to, so they are advantageous potential oil region.