珠江口盆地烃源岩特征及资源潜力

doi:10.7623/syxb2019S1005

石油学报 ›› 2019, Vol. 40 ›› Issue (s1): 53-68.DOI: 10.7623/syxb2019S1005

珠江口盆地烃源岩特征及资源潜力

朱明, 张向涛, 黄玉平, 朱俊章, 龙祖烈, 史玉玲, 石创, 张小龙

中海石油(中国)有限公司深圳分公司广东深圳 518054

收稿日期:2018-07-09 修回日期:2018-12-03 出版日期:2019-07-25 发布日期:2019-07-15
通讯作者: 朱明,男,1963年12月生,1985年获云南大学学士学位,现为中海石油(中国)有限公司深圳分公司副总地质师,主要从事油气勘探开发研究工作。Email:zhuming2@cnooc.com.cn
作者简介:朱明,男,1963年12月生,1985年获云南大学学士学位,现为中海石油(中国)有限公司深圳分公司副总地质师,主要从事油气勘探开发研究工作。Email:zhuming2@cnooc.com.cn
基金资助:
国家科技重大专项"珠一坳陷古湖泊演化与富烃凹陷优选"（2016ZX05024-002-008）资助。

Source rock characteristics and resource potential in Pearl River Mouth Basin

Zhu Ming, Zhang Xiangtao, Huang Yuping, Zhu Junzhang, Long Zulie, Shi Yuling, Shi Chuang, Zhang Xiaolong

Shenzhen Branch of CNOOC China Limited, Guangdong Shenzhen 518054, China

Received:2018-07-09 Revised:2018-12-03 Online:2019-07-25 Published:2019-07-15

摘要/Abstract

摘要：

珠江口盆地是一个先断后坳、先陆后海且具有变地温场特征的盆地，发育文昌组、恩平组和珠海组3套烃源岩。根据盆地大量烃源岩样品的分析化验资料，将实验分析、地质分析与地质模拟相结合，对3套烃源岩发育特征的差异性和凹陷/半地堑/洼陷的热演化史、生烃史、资源潜力进行综合分级评价。研究结果表明：①裂陷早-中期文昌组湖相倾油型烃源岩是研究区主力烃源岩，裂陷晚期恩平组煤系油气兼生型烃源岩是研究区重要烃源岩，坳陷期珠海组海相陆源油气兼生型烃源岩只在白云凹陷进入生烃门限；②地温梯度自浅水向深水逐渐升高，导致烃源岩的成熟门限和生烃窗口快速变浅，浅水区烃源岩整体处于成熟-高成熟阶段，具有晚期生烃的特征，主生烃期在16 Ma至现今；深水区烃源岩整体处于成熟-过成熟阶段，白云凹陷具有早期生烃的特征，主生烃期在33~0 Ma；③评价得出珠江口盆地总地质资源量约为85×10⁸t，油气资源丰富，浅水区以石油资源为主，深水区油、气资源量相当；④根据海上生烃凹陷评价标准，惠州凹陷、白云凹陷、陆丰凹陷、西江凹陷、恩平凹陷为富生烃凹陷，开平凹陷、荔湾凹陷为中等生烃凹陷，具有较好的勘探潜力。

关键词: 珠江口盆地, 烃源岩特征, 热演化, 生烃, 油气资源潜力

Abstract:

The Pearl River Mouth Basin is a basin with the characteristics of variable geothermal field, firstly presented as a fault transforming into depression later, transferring from land to sea. In this basin, three sets of source rocks are developed, i.e., Wenchang Formation, Enping Formation and Zhuhai Formation. Based on the analysis and test on a large number of source rock samples in combination with experimental analysis, geological analysis and geological simulation, this study conducts a comprehensive grading evaluation on the development characteristics of the three sets of source rocks and the thermal evolution history, hydrocarbon generation history and resource potential of the depression/half graben/sag. The research indicates that (1)the lacustrine oil-prone source rocks in Wenchang Formation during the mid-early rifting stage are the chief source rocks in this region, while the coal-measure oil-gas-bearing source rocks in Enping Formation during the late rifting stage are important source rocks in this region. Only in Baiyun sag, the marine terrigenous oil-gas-bearing source rocks in Zhuhai Formation during the depression stage entered the hydrocarbon generation threshold. (2)The geothermal gradients increased from shallow area to deep-water, which resulted in the fact that maturity threshold and hydrocarbon generation window were located in the water area rapidly becoming shallow. In the shallow area, source rocks were developed in the mature-high maturity stage, characterized with late hydrocarbon generation. The main hydrocarbon generation period was from 16 Ma to the present. In the deep water, source rocks are in the mature-over mature stage, and Baiyun sag is characterized with early hydrocarbon generation with the main hydrocarbon generation period of 33-0 Ma. (3)The total geological resource of Pearl River Mouth Basin is about 85×10⁸ tons through assessment. It is rich in oil and gas resources, where the shallow water area is dominated by petroleum resources, equivalent with the oil and gas resources in the deep water area. (4)According to the evaluation criteria of offshore hydrocarbon-generation depression, Huizhou, Baiyun, Lufeng, Xijiang, and Enping sags are hydrocarbon-rich depressions, and Kaiping and Liwan sags are moderate hydrocarbon generation depressions with favorable exploration potential.

Key words: Pearl River Mouth Basin, source rock characteristics, thermal evolution, hydrocarbon generation, hydrocarbon resource potential

中图分类号:

TE122.2

朱明, 张向涛, 黄玉平, 朱俊章, 龙祖烈, 史玉玲, 石创, 张小龙. 珠江口盆地烃源岩特征及资源潜力[J]. 石油学报, 2019, 40(s1): 53-68.

Zhu Ming, Zhang Xiangtao, Huang Yuping, Zhu Junzhang, Long Zulie, Shi Yuling, Shi Chuang, Zhang Xiaolong. Source rock characteristics and resource potential in Pearl River Mouth Basin[J]. Acta Petrolei Sinica, 2019, 40(s1): 53-68.

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珠江口盆地烃源岩特征及资源潜力

Source rock characteristics and resource potential in Pearl River Mouth Basin

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