摘要
在分析贵州凯里地区及邻区古生界烃源岩特征基础上,重点分析了凯里地区下古生界原油地球化学特征。研究表明,凯里地区下古生界原油、油砂的碳同位素组成特征与下古生界烃源岩抽提物碳同位素组成较为接近,而与二叠系烃源岩抽提物的差异较大,反映原油与下古生界亲缘关系较好。但原油、油砂在规则甾烷组成特征、四环萜烷相对含量、γ蜡烷指数等生标特征参数上,却与二叠系烃源岩更为相似,表明研究区下古生界原油、油砂中的石油可能为下古生界烃源岩和二叠系烃源岩生成油的混源油;结合研究区及邻区构造—沉积演化史、烃源岩生烃演化史探讨了混源油形成的地质过程。
The geochemical characteristics of the Lower Palaeozoic crude oil from Kaili and its adjacent areas in Guizhou Province has been analyzed with emphasis in this paper based on the characteristics of the source rocks of the same areas. The results show that the stable carbon isotopic composition of the Lower Palaeozoic crude oil and oil sand is similar to that of the Lower Palaeozoic source rock extract, but obviously different from that of the Permian source rock extract, indicating that the crude oil is more closely related to the Lower Palaeozoic source rocks. While the biomarker parameters of the crude oil and the oil sand, such as the regular sterane, the tetracyclic terpane and the gammacerane/C31-hopane, are more related to those of the Permian source rocks, indicating that the oil from the Lower Palaeozoic and the oil sand may be the mixture of oils generated from the Lower Palaeozoic and the Permian source rocks. The formation process of the mixture oil has also been discussed based on the structural-sedimentary evolution history and the hydrocarbon generation history of the source rocks in the study area.
出处
《石油实验地质》
CAS
CSCD
北大核心
2008年第2期186-191,共6页
Petroleum Geology & Experiment
基金
中国石油化工股份有限公司勘探南方分公司项目[2004-17(KT)]
关键词
原油
烃源岩
地球化学特征
油源对比
下古生界
凯里地区
贵州
crude oil source rock
geochemical characteristics
oil and source rock correlation Lower Palaeozoic
Kaili area Guizhou Province
