Abstract
Four oil-bearing sandstone samples of Chang 8 sub-unit were collected from Ordos basin and geochemical characteristics of hydrocarbon in different states during oil-filling process were determined. The occurrence of hydrocarbon in sandstone can be divided into four types by using sequential extraction. The features of alkanes, the diagram of Pr/nC17 versus Ph/nC18 and the cross plot of MPI-1 versus Rc show that four type hydrocarbons derived from same source rock, the organic matter includes aquatic organisms and higher plants, moreover, the thermal maturity of the free hydrocarbon is the highest, followed by the sealed hydrocarbon and the cement hydrocarbon, and the inclusion hydrocarbon is the lowest. The variation of geochemical features of hydrocarbons in different states may result from continuous oil-charging in geological history.
Sign-in/Register to access full text options 
Free) 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call
