HYDROCARBON EXPULSION OF IMMATURE AND LOW-MATURE SOURCE ROCKS IN CHAOCHANG AREA OF THE SONGLIAO BASIN

In this paper,the hydrocarbon expulsion course of low mature source rocks from the Cretaceous of Chaochang area and the Tertiary of peripheral Tangyuan area in the Songliao Basin is studied by laboratory simulation.We experiment upon samples at 150℃,200℃,250℃ and 300℃,respectively.The results suggest that the geo chromatographic effects do exist during the hydrocarbon expulsion course of low mature source rocks,which are shown mainly by the differences of group composition,gas chromatogram and biomarkers between expelled and residual hydrocarbon.We also figure and correct the hydrocarbon expulsion quantity and efficiency in the simulation experiment at each temperature point,and obtain the experience formulation for the hydrocarbon expulsion efficiency and evolutionary degree of low mature source rocks in Chaochang area.It is considered that the hydrocarbon expulsion of low mature source rocks is mainly controlled by the abundance,types and thermal evolutionary maturity of organic matter and the movement of groundwater.The low mature source rocks of this area have good hydrocarbon generation capability and hydrocarbon expulsion potential,so they have good prospects for hydrocarbon resources.