Based on systematic analysis of group compositions, saturated hydrocarbon GC-MS for source rocks and crude oil in Nai 1 block, the geochemical characteristics and oil-source correlation were studied. The follwing are the characteristics of crude oil and lower Jiufotang formation source rocks; The distribution of alkane is complete, possessing double peaks which are nC23 and C17 respectively. Content of phytane is obviously higher than pristane w( Pr)/w( Ph)= 0. 36-0. 53. For sterane series, the content of regular sterane, distributing in the shape of " V" , is also obviously higher than the counterpart of preg-nane and rearranged sterane. Besides, the value of the parameters of C29,W(20S)/W(20S+20R) and w( ββ)/w(αα+ββ) are respectively 0. 27-0. 49 and 0. 23-0. 39. The terpane series is characterized by major part of CMHopane, relatively higher conLent of tncyclic diterpane and gammacerane but lower content of rearranged sterane, w(Ts) 展开▼
