Abstract:

Steroids,terpanes,porphyrins and perylenes etc. from source rocks and crude oil of Lower Tertiary (Eocene)in Jianghan basin are analyzed by means of IR,UV,UVF and GC-MS etc. Characteristics of source rocks and crude oil as well as sedimentary environment,maturity of source materials,oil migration and types of organic matters of the basin are discussed. According to the study of biological mark compounds and systematic molecular parameters,the authors suggest that:(1) The oil source of the Qianjiang Formation is different from that of the Xingouzui Formation;(2) Though the buried depth of Xingouzui reservoir is shallow,it has a high maturity;(3) Oil-generating threshold in the Qianjiang Formation is about 1900m;(4) The presence of gammacerane is typical of the continental organic source material.