渤海湾盆地歧口凹陷原油成熟度及成因类型  

Maturity and Genetic Type of Crude Oils in Qikou Sag, Bohai Bay Basin

作　　者：陈敬轶[1] 王飞宇[1] 周勇[1] 杨莉[1] 段仕川[1] 

机构地区：[1]中国石油大学资源与信息学院,北京102249

出　　处：《新疆石油地质》2010年第3期242-244,共3页Xinjiang Petroleum Geology

摘　　要：对歧口凹陷不同油气田和不同层位59个原油和102个烃源岩抽提物的地球化学分析,并综合合多个正构烷烃、甾萜类生物标志物及轻烃指标分析认为,歧口凹陷原油为成熟原油,唐家河等地区浅层原油遭到部分生物降解。选取伽马蜡烷指数、m(Pr)/m(Ph)、m(4-甲基甾烷)/m(C29规则甾烷)、全油碳同位素等4个参数作为变量,进行SPSS聚类分析,将原油划分为淡水湖相和咸水湖相两类,前者主要分布在歧口及板桥凹陷西缘隆起,后者位于北塘凹陷和板桥西北部。Qikou sag is one of the rich-oil areas in Bohai Bay basin,in which three sets of lacustrine source rocks developed in Tertiary and Paleozoic reservoirs.The geochemical analyses of 59 crude oil and 102 source rock samples from Qikou sag show that the crude oils in Qikou sag belong to mature oil,combined with the biomarkers of n-alkanes,steroid and terpenoid as well as light hydrocarbons index,the biodegraded oil only locates in shallow layers in Tangjiahe region.SPSS cluster analysis based on four variable parameters of gammacerane index,m（Pr）/m（Ph）,m（4-methyl-sterane）/m（C29 regular sterane） and oil carbon isotope indicates that the crude oils can be classified as fresh water lacustrine oil from Qikou sag and western uplift of Banqiao sag and salt water lacustrine oil from Beitang sag and northwestern Banqiao sag.

关 键 词：渤海湾盆地 歧口凹陷 地球化学 原油族群 成熟度 聚类分析 

分 类 号：TE122.1[石油与天然气工程—油气勘探]