珠江口盆地白云凹陷原油双杜松烷分布特征及地球化学意义

卢晓林; 石宁; 李美俊; 张忠涛; 付健; 陈聪; 赖洪飞; 代金慧

doi:10.11781/sysydz201904560

珠江口盆地白云凹陷原油双杜松烷分布特征及地球化学意义

doi: 10.11781/sysydz201904560

卢晓林¹,
石宁²,
李美俊^1,3, ,,
张忠涛²,
付健¹,
陈聪²,
赖洪飞¹,
代金慧¹

1. 中国石油大学(北京) 油气资源与探测国家重点实验室, 北京 102249;
2. 中国海洋石油南海东部公司, 广东深圳 518000;
3. 长江大学资源与环境学院油气资源与勘探技术教育部重点实验室, 武汉 430100

基金项目:

十三五国家科技重大专项（2016ZX05026-003）、国家自然科学基金项目（41272158）和油气资源与探测国家重点实验室开放课题（PRP/open-1710）共同资助。

详细信息

作者简介:
卢晓林(1992-),男,硕士,从事油气地球化学研究。E-mail:lxlcupgeosci@163.com。

通讯作者:
李美俊(1972-),男,博士,教授,从事油气地球化学研究。E-mail:meijunli@cup.edu.cn。

中图分类号: TE122.113
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出版历程
- 收稿日期: 2018-10-29
- 修回日期: 2019-05-23
- 刊出日期: 2019-07-28

Distribution patterns and geochemical implication of bicadinanes in crude oils from Baiyun Sag, Pearl River Mouth Basin

1. State Key Laboratory of Petroleum Resources and Prospecting, College of Geosciences, China University of Petroleum, Beijing 102249, China;
2. CNOOC Nanhai East Corporation, Shenzhen, Guangdong 518000, China;
3. Key Laboratory of Exploration Technologies for Oil and Gas Resources, Ministry of Education, College of Resources and Environment, Yangtze University, Wuhan, Hubei 430100, China

摘要

摘要: 珠江口盆地白云凹陷原油中双杜松烷（W和T）含量丰富。基于35个原油样品系统的色谱-质谱（GC-MS）分析，对白云凹陷双杜松烷分布特征及地球化学意义进行了研究。白云凹陷原油双杜松烷相对含量分布明显呈现"北高东低"的特点。双杜松烷相对含量在成熟-高成熟原油中基本不随成熟度变化，也不受气洗作用的影响，而主要受油气来源的控制。双杜松烷相对含量与姥鲛烷/植烷（Pr/Ph）及三环萜烷（C₁₉TT+C₂₀TT）/C₂₃TT均呈现正相关关系，偏氧化及高陆源输入的环境有利于双杜松烷的富集。双杜松烷相对含量是指示生源、沉积环境及油源分析的良好指标。此外，双杜松烷T/W比值是有效的成熟度参数，适用于低-中等成熟度的原油和有机质。
- 双杜松烷 /
- 沉积环境 /
- 有机质输入 /
- 成熟度 /
- 白云凹陷 /
- 珠江口盆地
Abstract: Bicadinanes (W, T) are abundant in crude oils in the Baiyun Sag of the Pearl River Mouth Basin. The distribution patterns and geochemical implication of bicadinanes in crude oils from the study area were investigated based on the gas chromatography-mass spectrometry of 35 oil samples. The relative content of bicadinanes in crude oils is relatively higher in the north but lower in the east of the sag. Maturity and gas washing exert a minor impact on the relative contents of bicadinanes in mature to high-maturity crude oils, while hydrocarbon sources play an important role. The relative content of bicadinanes is positively related to Pr/Ph and tricyclic terpane (C₁₉TT+C₂₀TT)/C₂₃TT ratios, which shows that an oxidizing environment with high terrestrial input is more favorable for the enrichment of bicadinanes. Therefore, the relative content of bicadinanes can be used to define biological source, depositional environment and oil-source correlations. In addition, bicadinane T/W ratios may serve as an index for evaluating maturity in low to medium-maturity crude oils.
- bicadinanes /
- depositional environment /
- organic matter input /
- maturity /
- Baiyun Sag /
- Pearl River Mouth Basin

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