摘要
长兴灰岩中的原油主要表现为陆源有机质的特征。富含高分子量正烷烃,富含长链无环类异戊二烯烷烃、倍半萜烷和 C_2。甾烷,五环三萜烷组分中以一种未知结构的 C_(30)(X)化合物为主,还检出四种 C_(24)四环萜烷。油苗可能主要来源于龙潭组煤层。
A mature seep oil was discovered in the limestone of Permian Chongxing group which is just underlain by the coal beds of Permian I.ongtan group. It is proposed through oil-source rock correlation of biomarkers and stable carbon isotope ratios that the seep oil was mainly sourced from such source rock as the No. 4 Longtan coal bed, in which the suberinite is abundant in coal macerals. The crude oil is rich in n-al-kanes of high molecular weight, long chain acyclic isoprenoid alkanes, and sesquite-rpanes and possesses the predominant C29 component in steranes. An unknown structure compound C30(X) is the major peak in pentacyclic triterpanes. Four C24 tetracyclic terpanes were detected in the crude oil, one is 17,21-secohopane, three other tetracyclic terpanes are structure-unknown compounds with the characteristic mass fragments, e. g. m/z: 191 (base peak), 109, 123,330(M+), 315(M-15), etc.. The crude oil has low hopane/sterane ratio below unit, and is rich in tricyclic terpanes with C19-C29, which means that microbial contribution can not be negligible in its sources besides major terrigenous organic matter.
出处
《地质科学》
CAS
CSCD
北大核心
1993年第4期347-355,共9页
Chinese Journal of Geology(Scientia Geologica Sinica)
基金
中国科学院的研究项目:"中国石油
天然气成因理论及应用"的成果
