四环聚异戊二烯类化合物:中国东部断陷湖盆新分子化石  

Tetracyclic Polyprenoids: A New Biomarker in the Rifted Lacustrine Basin in East China

作　　者：杨永才 李友川 孙玉梅 吴克强 刘丽芳 

机构地区：[1]中海油研究总院,北京100028

出　　处：《沉积学报》2017年第4期834-842,共9页Acta Sedimentologica Sinica

基　　金：国家科技重大专项项目(2016ZX05024-002);中国海洋石油有限公司勘探综合研究项目(2012-KT-11;2013-KT-09-05)~~

摘　　要：渤海湾盆地海域断陷湖盆歧口凹陷古近系烃源岩及原油样品中,检测出丰富的四环聚异戊二烯类化合物。四环聚异戊二烯类化合物(C_(30)TPP)具有两个异构体,能有效地区分渤海湾盆地海域歧口凹陷沙三段(Es_3)烃源岩和沙一段(Es_1)烃源岩形成的混源原油,是湖相原油的油源对比研究中的新分子化石。四环聚异戊二烯类化合物与水体盐度之间有密切关系,沉积环境水体盐度越高,其丰度越高。随热演化程度增大,原油的四环聚异戊二烯类化合物(TPP)丰度逐渐降低。四环聚异戊二烯类化合物(TPP)具有湖相有机质输入的很强专属性,可用于判识湖相原油研究,在研究湖相沉积环境有机质的油源对比、沉积环境及热演化规律中具有重要地质—地球化学意义。The tetracyclic polyprenoid compounds are the powerful tools for recognition of the fresh/brackish water algal input into lacustrine depositional setting of hydrocarbon source rocks. The tetracyclic polyprenoid compounds（ TPP） are observed in the samples derived from the Paleogene source rocks and crude oils in Qikou Sag in offshore Bohai Bay Basin in East China rifted lacustrine basins. Two isomers of the tetracyclic polyprenoids are detected based on the retention time of gas chromatography（ GC）,mass spectrum characteristics and compared with other literatures.Tetracyclic polyprenoid compounds are present in relatively high concentrations in oils and associated source rocks deposited under increased saline conditions and may be useful in the recognizing changes in water salinity. The tetracyclic polyprenoids are new geochemical markers of the oil-source rock correlations in Qikou sag in offshore Bohai Bay Basin in East China rifted lacustrine basins and sorting effectively out the crude oil from the hydrocarbon resource rocks of the 3^rdMember（ Es3） and 1^stMember（ Es1） of the Eocene Shahejie Formation. The tetracyclic polyprenoids are significantly useful to assessing the algal input,depositional environment and the correlations between the oils and source rocks.

关 键 词：四环聚异戊二烯类化合物(TPP) 生物标志物 油源对比 湖相 沙河街组 断陷湖盆 

分 类 号：P618.13[天文地球—矿床学]