高邮凹陷北斜坡戴南组原油地球化学特征  

GEOCHEMICAL CHARACTERISTICS OF THE CRUDE OIL IN DAINAN FORMATION OF THE NORTHERN SLOPE IN GAOYOU SAG

作　　者：仇永峰 

机构地区：[1]江苏油田分公司勘探开发研究院,江苏扬州225009

出　　处：《大庆石油地质与开发》2017年第5期14-19,共6页Petroleum Geology & Oilfield Development in Daqing

基　　金：中石化科技开发部攻关项目"苏北盆地隐蔽性断层分布与控藏研究"(P09017)

摘　　要：高邮凹陷北斜坡戴南组油气来源复杂,通过对研究区戴南组已发现油藏原油系统采样,利用色谱—质谱分析技术,分析了原油的生物标志化合物特征,明确了油气来源。研究表明,依据饱和烃色谱及萜、甾烷指纹特征,戴南组原油在Pr/Ph值、规则甾烷、β—胡萝卜烷、伽马蜡烷含量等方面有较明显差别,反映了各类原油来自不同油源,可以划分为3类。Ⅰ类原油来自阜四段和阜二段混源油,母源以高等植物贡献为主,形成于半咸化环境,热演化程度较高;Ⅱ类原油主要来自阜四段成熟油,母源除了有高等植物的输入也有菌藻类等低等水生生物输入;Ⅲ类原油来自阜二段成熟油,母源以高等植物贡献为主,形成于较强的还原咸化环境。Hydrocarbon sources in the Northern Slope of Gaoyou Sag are complex,through the systemical sampling from the discovered crude oil in Dainan Formation in the studied area,with the help of the analyses of GC-MS,the geochemical characteristics were figured out for the biomarkers of the crude oil,finally the oil and gas sources were made clear. The research shows than according to the saturated hydrocarbon GC and the sterane and terpane fingerprint characteristics,there are rather obvious differences in the content aspects of the Pr/Ph value,regular sterane,β-carotene,gammacerane and so on in Dainan Formation,thus conditions response that each kind of the crude oil is from different oil resources and can be divided into three types： Type Ⅰis the mixed oil from Member Fu-4 and Fu-2,the organic matters mainly come from the higher plants,mixed source of aquatic organism and generate in brackish water environment and the thermal evolution degree is pretty higher; Type Ⅱ is principally the mature oil from Member Fu-4,for the organic matters,besides from the higher plants,are also from the lower aquatic creature such as the thallogen and so forth; Type Ⅲ is the mature oil from Member Fu-2,the organic matters take the higher plants as the key contributors and generate in the much stronger reducing and brine environments.

关 键 词：高邮凹陷 北斜坡戴南组 原油 生物标志物 地球化学特征 油源分析 

分 类 号：TE122.1[石油与天然气工程—油气勘探]