石油学报 ›› 2015, Vol. 36 ›› Issue (7): 781-790.DOI: 10.7623/syxb201507002

• 地质勘探 • 上一篇    下一篇

古老碱湖优质烃源岩:准噶尔盆地下二叠统风城组

曹剑1, 雷德文2, 李玉文3, 唐勇2, 阿布力米提2, 常秋生2, 王婷婷1   

  1. 1. 南京大学地球科学与工程学院 江苏南京 210023;
    2. 中国石油新疆油田公司勘探开发研究院 新疆克拉玛依 834000;
    3. 中国石油杭州地质研究院 浙江杭州 310023
  • 收稿日期:2014-12-17 修回日期:2015-05-06 出版日期:2015-07-25 发布日期:2015-08-06
  • 作者简介:曹 剑,男,1978年10月生,1999年获西南石油学院学士学位,2005年获南京大学博士学位,现为南京大学教授、博士生导师,主要从事石油地质学与有机地球化学研究和教学工作。Email:jcao@nju.edu.cn
  • 基金资助:

    国家自然科学基金项目(No.41322017,No.41472100)和中国石油天然气集团公司重大科技专项(2012E-34-01)资助。

Ancient high-quality alkaline lacustrine source rocks discovered in the Lower Permian Fengcheng Formation, Junggar Basin

Cao Jian1, Lei Dewen2, Li Yuwen3, Tang Yong2, Chang Qiusheng2, Abulimit2, Wang Tingting1   

  1. 1. School of Earth Sciences and Engineering, Nanjing University, Jiangsu Nanjing 210023, China;
    2. Research Institute of Petroleum Exploration and Development, PetroChina Xinjiang Oilfield Company, Xinjiang Karamay 843000, China;
    3. PetroChina Hangzhou Research Institute of Geology, Zhejiang Hangzhou 310023, China
  • Received:2014-12-17 Revised:2015-05-06 Online:2015-07-25 Published:2015-08-06

摘要:

碱 湖优质烃源岩是陆(湖)相优质烃源岩的一种重要类型, 迄今发现的典型实例主要分布于古近系始新统, 准噶尔盆地下二叠统风城组可能是这类烃源岩的最古老实例, 典型证据包括3方面:沉积学方面的成碱演化序列完整, 岩石矿物学方面的碱性矿物与丰富的微生物和黄铁矿, 地球化学方面的生物标志化合物。在生烃特征上, 风城组具有典型碱湖优质烃源岩的特征, 表现为有机质丰度高、类型好、生烃能力强, 丰富藻类有机质和微生物的存在使得烃源岩长期生烃, 所生油气优质, 成熟—高熟轻质油气连续充注, 这是研究区玛湖百里大油(气)区得以形成的根本资源基础。这一古老碱湖优质烃源岩的发现具有潜在重要 科学与勘探意义。

关键词: 碱湖, 风城组, 二叠系, 陆相烃源岩, 玛湖大油(气)区, 准噶尔盆地

Abstract:

High-quality alkaline lacustrine source rocks are an important type of continental (lacustrine) high-quality source rocks. So far, typical cases are mainly found in the Eocene, and the possible oldest case has been preliminarily reported in this paper, i.e., the Lower Permian Fengcheng Formation, Junggar Basin. Fengcheng Formation belongs to alkaline lacustrine deposition, and the representative evidences mainly include three aspects, i.e., complete alkaligenous evolution sequence in the sedimentology, alkaline minerals as well as plentiful microbes and pyrites in the petromineralogy, and biomarkers in the geochemistry. In terms of hydrocarbon generation, Fengcheng Formation has the typical characteristics of high-quality alkaline lacustrine source rocks, shown as high organic matter abundance, good type and strong hydrocarbon generation capacity. Plentiful algae organic matters and microbes result in continuous hydrocarbon generation with high-quality oil and gas as well as constant charging of light oil and gas with moderate-high maturity, which provides the ultimate resource foundation for the formation of Mahu giant oil (gas) province in hundreds of miles. Such discovery of the old high-quality alkaline lacustrine source rocks has the potential important scientific inspirations and exploration implications.

Key words: alkaline lake, Fengcheng Formation, Permian, continental source rock, Mahu giant oil (gas) province, Junggar Basin

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