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中国华南陡山沱组烃源岩的形成机制与分布预测
投稿时间:2020-04-28  修订日期:2020-05-24  点此下载全文
引用本文:
DOI:10.19762/j.cnki.dizhixuebao.2020277
摘要点击次数: 119
全文下载次数: 151
作者单位地址
朱光有 中石油勘探开发研究院北京 北京市海淀区学院路20号中石油勘探开发研究院
赵坤 中国地质大学(北京) 
李婷婷 中石油勘探开发研究院北京 
张志遥 中国地质大学(武汉) 
基金项目:论文研究受中国石油天然气股份有限公司科学研究与技术开发项目“古老碳酸盐岩油气成藏分布规模与关键技术”(2019B-04)和“深层烃源岩形成与分布”(2018A-0102)联合资助
中文摘要:震旦系(埃迪卡拉系)陡山沱组是成冰系(南华系)极端冰期事件结束后首次沉积的间冰期地层,大规模的海侵活动导致在全球广泛发育富有机质黑色页岩,可能是未来深层油气和页岩气勘探的重要烃源岩层。中国华南陡山沱组烃源岩分布广泛,由于受古构造格局、沉积相带等因素影响,烃源岩非均质性强、平面上分布差异大。本文在前人研究基础上,结合3个剖面的有机地球化学、古生物学和沉积地球化学等分析,对比华南10个典型剖面,分别对陡二段和陡四段烃源岩的沉积环境开展分析,认为陡二段烃源岩形成于海侵背景下的贫氧环境,陡四段烃源岩形成于海退背景下的缺氧滞留环境;多细胞藻类和疑源类是主要母质来源。不同相带对比研究表明,台地相主要发育陡四段烃源岩(TOC平均值为3.61%),斜坡相发育陡二段(TOC均值为2.20%)和陡四段烃源岩(TOC平均值为3.66%)。烃源岩厚度和质量明显受控于沉积环境和古裂陷等。结合露头和钻井资料,对华南陡山沱组烃源岩分布及厚度开展预测和编图,提出了优质烃源岩分布的有利区域,为深层油气勘探和页岩气富集区预测提供了依据。
中文关键词:沉积环境  烃源岩分布  陡山沱组  华南
 
Formation Mechanism and Distribution Prediction of Source Rocks in the Doushantuo Formation of Ediacaran, South China
Author NameAffiliationAddress
Zhu Guangyou Research Institute of Petroleum Exploration and Development, PetroChina, Beijing 北京市海淀区学院路20号中石油勘探开发研究院
ZhaoKun China University of Geosciences, Beijing 
Li Tingting Research Institute of Petroleum Exploration and Development, PetroChina, Beijing 
Zhang Zhiyao China University of Geosciences, Wuhan 
Abstract:Doushantuo Formation is the first interglacial deposited at the end of the extremely glacial event of the Cryogenian. Extensive transgression results in the development of organic rich black shale in the world, which is an important source rock for deep oil and gas exploration at present. Widely distributed of Doushantuo Formation source rocks in South China, which are affected by tectonic and sedimentary facies, resulting in great difference in spatial distribution of source rocks and strong heterogeneity, which brings risks to oil and gas exploration and prediction. On the basis of previous studies, combined with the analysis of organic geochemistry, paleontology and sedimentary geochemistry of three profiles, this study compared 10 typical profiles in South China, and found that Doushantuo Formation developed the member Ⅱ and member Ⅳ source rocks. The analysis of redox environment shows that the source rocks of member Ⅱ are formed in dysoxic environment in transgressive background, and the source rocks of member Ⅳ are formed in anoxic environment in regressive background. Multicellular algae and acritarcha are the main source materials. The comparative study shows that the platform facies mainly develops the member Ⅳ source rock (TOC average value is 3.61%), the slope facies mainly develops member Ⅱ (TOC average value is 2.20%) and member Ⅳ source rock (TOC average value is 3.66%). Based on a large number of analysis data and profile correlation, it is considered that the thickness and quality of source rock are obviously controlled by paleo-depression and redox environment. Based on the outcrop and drilling data, the thickness distribution of the source rocks in Doushantuo Formation of South China (member Ⅱ + member Ⅳ) is predicted. A favorable area for excellent source rock distribution is proposed, which provides a basis for deep oil and gas exploration and prediction of shale gas-rich areas.
keywords:Redox environment  Source rock distribution  Doushantuo Formation  South China
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