世界地质 2016, 35(4) 1066-1075 DOI:     ISSN: 1004-5589 CN: 22-1111/P

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本文关键词相关文章
生物标志物
4 - 甲基甾烷
双杜松烷
奥利烷
原油
珠江口盆地
本文作者相关文章
陈希文
包建平
朱翠山
PubMed
Article by Chen, X. W.
Article by Bao, J. P.
Article by Zhu, C. S.
珠江口盆地不同类型原油地球化学特征
陈希文, 包建平, 朱翠山
1. 长江大学 资源与环境学院,武汉 430100; 2. 长江大学 油气资源勘探技术重点实验室,武汉 430100
摘要

为明确白云凹陷目前发现原油的成因及来源,系统分析取自珠江口盆地不同类型原油中各类生物标志物的分布与组成特征,发现番禺低隆起北部构造及番禺4 洼的原油具有姥植比低 ( <2. 0),指示陆源有机质输入的奥利烷含量中等,基本缺乏达玛树脂贡献的双杜松烷,各类重排构型甾藿含量较低,而指示沟鞭藻贡献的 C 30 4 - 甲基甾烷异常丰富的特点。C 30 4 - 甲基甾烷与 C 29 规则甾烷的比值>2. 1,且其三环萜烷系列 C 19 -26 呈现以 C 21 为主峰的正态分布,指示其原始生烃母质以藻类为主,表明这类原油与文昌组湖相烃源岩具有较好的可比性; 而番禺低隆起南部构造及白云凹陷的凝析油具有姥植比高 ( >4. 0),明显富含奥利烷和双杜松烷,各类重排构型甾藿烷含量较高,缺乏 C 30 4 - 甲基甾烷的特点,且其三环萜烷 C19-26 呈现阶梯状依次降低的特点,表明陆源有机质是其主要原始生烃母质,这符合白云凹陷发育恩平组煤系烃源岩的石油地质背景。

关键词 生物标志物   4 - 甲基甾烷   双杜松烷   奥利烷   原油   珠江口盆地  
Geochemical characteristics in different crude oils from the Pearl River Mouth Basin
CHEN Xi-Wen, BAO Jian-Ping, ZHU Cui-Shan
1. College of Resources and Environment,Yangtze University,Wuhan 430100,China; 2. Key Laboratory of Oil and Gas Resources and Exploration Technology,Yangtze University,Wuhan 430100,China
Abstract:

To figure out the origin and sources of crude oils from Baiyun sag of the Pearl River Mouth Basin, the authors analyzed the distributions and compositions of various biomarkers in two kinds of crude oils from differ- ent tectonic units in the Pearl River Mouth Basin systematically. It is found that the Pr/Ph ratios of the crude oils from the north structures of the Panyu low uplift and panyu 4 sub-sag are relatively low ( <2. 0),which indicates that the terrigenous organic matter input is moderate,and the bicadinanes derived from dammar resin are almost ab- sent,the contents of rearranged steranes and hopanes are low. However,C 30 4-methyl steranes related to dinoflagel- lates are abnormally abundant,and the ratio of C 30 4-methyl steranes and C 29 regular sterane is more than 2.1,and the C 19 -26 tricyclic terpanes show a normal distribution while the dominant peak is C 21 ,suggesting that algae has made an important contribution to original hydrocarbon parent material,which is consistent with that of lacustrine source rocks of the Wenchang Formation. The Pr/Ph ratios of the condensates from the south structures of the Pan- yu low uplift and Baiyun sag are more than 4. 0,with abundant oleanane and bicadinanes,the contents of rear- ranged steranes and hopanes are relatively high,lacking C 30 4-methyl steranes. While tricyclic terpane C 19 -26 presents the characteristics of the trapezium in turn reduce,indicating that terrigenous organic matter is their original parent material,which accords with the petroleum geology background of the development of coal-containing source rocks of the Enping Formation in the Baiyun sag.

Keywords: biomarker   4-methyl steranes   oleanane   bicadinanes   crude oil   Pearl River Mouth Basin  
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