Abstract:

N Depression is a Meso Cenozoic faulted depression.SL and AJ oil bearing structures were discovered in Lower Cretaceous AJ Formation in the central uplift belt of the depression.Oil oil correlation result shows that,the crude oil group composition of the above mentioned oil bearing structures are the same,suggesting that the oils should be derived from the same source rock.The result of oil source rock correlation indicates that ,the maturaty of crude oil is clearly higher than that of the source rock in the uplift belt but equal to that of the source rock of the oil generation sags in two side.Besides,the composition of sterane,the distribution of hopane and the value of carbon isotope of crude oil or oil sand coincide with those of the source rock in the sags.This thus further indicates that the crude oil is derived from the source rock in the sags

Key words: crude oil, oil source rock, maturity, carbon isotope, biomarker, N Depression