石油学报 ›› 2025, Vol. 46 ›› Issue (2): 306-319,354.DOI: 10.7623/syxb202502002

• 地质勘探 • 上一篇    下一篇

准噶尔盆地东部石钱滩凹陷上石炭统烃源岩地球化学特征及勘探意义

李建忠1,2, 杨润泽2, 杨斌1, 康积伦1, 林潼2, 苟红光1, 马强1, 刘俊田1, 孙宏亮1, 李攀2   

  1. 1. 中国石油吐哈油田公司 新疆哈密 839009;
    2. 中国石油勘探开发研究院 北京 100083
  • 收稿日期:2024-01-02 修回日期:2024-09-14 出版日期:2025-03-13 发布日期:2025-03-13
  • 通讯作者: 杨润泽,男,1992年11月生,2021年获中国石油勘探开发研究院博士学位,现为中国石油勘探开发研究院工程师,主要从事油气成藏综合研究。Email:youngrunze@163.com
  • 作者简介:李建忠,男,1968年11月生,1999年获中国石油勘探开发研究院博士学位,现为中国石油吐哈油田公司教授级高级工程师,主要从事石油地质综合研究及勘探评价工作。Email:lijizh@petrochina.com.cn
  • 基金资助:
    中国石油天然气股份有限公司科技项目"吐哈盆地风险勘探领域和目标研究、工程技术攻关及现场试验"(2023YQXNCS001-09)和中国石油天然气股份有限公司科技项目"深地煤岩气成藏理论与效益开发技术研究"(2023ZZ18YJ)资助。

Geochemical characteristics and exploration significance of the Upper Carboniferous source rocks in Shiqiantan sag of the eastern Junggar Basin

Li Jianzhong1,2, Yang Runze2, Yang Bin1, Kang Jilun1, Lin Tong2, Gou Hongguang1, Ma Qiang1, Liu Juntian1, Sun Hongliang1, Li Pan2   

  1. 1. PetroChina Tuha Oilfield Company, Xinjiang Hami 839009, China;
    2. PetroChina Research Institute of Petroleum Exploration and Development, Beijing 100083, China
  • Received:2024-01-02 Revised:2024-09-14 Online:2025-03-13 Published:2025-03-13

摘要: 准噶尔盆地东部石钱滩凹陷上石炭统海相烃源岩及碎屑岩油气藏的发现开拓了油气勘探的新领域。基于岩心、测井/录井和储层资料,借助烃源岩及油气的地球化学测试和扫描电镜分析等实验手段,对上石炭统石钱滩组烃源岩的地球化学特征与沉积环境开展了分析,建立了石钱滩凹陷的油气成藏模式。研究结果表明,石钱滩组烃源岩为陆源有机质供给丰富的倾气型烃源岩,整体处于成熟—高成熟阶段,是中等—优质烃源岩。其中,石钱滩组一段沉积水体相对更深、还原性更强、盐度更高,烃源岩品质更优。石钱滩凹陷烃源岩厚度大,生气强度大,具备形成大—中型气田的资源基础,呈现出"源内页岩气—近源岩性油气藏—远源构造-岩性油气藏"的立体成藏特征。石钱滩凹陷东北缓坡带的岩性油气藏和西南陡坡带的构造-岩性油气藏将成为未来增储上产的有利区域,西部断阶带的金沟组为油气进一步勘探的现实领域,中部洼陷区是页岩气勘探的潜在有利区。

关键词: 石钱滩组, 石钱滩凹陷, 海相烃源岩, 成藏模式, 勘探前景, 准噶尔盆地东部

Abstract: The discovery of the Upper Carboniferous marine source rocks and clastic reservoirs in Shiqiantan sag of the eastern Junggar Basin has opened up a new field for oil and gas exploration. Based on core samples, well logging and mud logging data, and reservoir information, in combination with the experimental methods such as geochemical testing and scanning electron microscopy analysis of source rocks, the paper analyzes the geochemical characteristics and sedimentary environment of the Upper Carboniferous source rocks in Shiqiantan Formation, and also establishes the hydrocarbon accumulation model for Shiqiantan sag. The results indicate that the source rocks of Shiqiantan Formation are gas-prone, rich in terrestrial organic matter, and primarily at a mature to highly mature stage, which are classified as medium to high-quality source rocks. Among these, the source rocks in the Member 1 of Shiqiantan Formation exhibits superior quality, due to deeper depositional waters, stronger reductive conditions, and higher salinity. Shiqiantan sag has thick source rocks with strong gas generation intensity, providing a resource base capable of supporting medium- to large-scale gas fields. It exhibits a three-dimensional accumulation mode characterized by "shale gas within source rocks, near-source lithologic reservoirs, and far-source structural-lithologic reservoirs". The lithologic reservoirs in the northeastern gentle slope zone and the structural-lithologic reservoirs in the southwestern steep slope zone of Shiqiantan sag are favorable areas for increasing reserves and production. Additionally, Jinggou Formation in the western fault-step zone represents a realistic field for further oil and gas exploration, while the central subsag is a potential favorable area for shale gas exploration.

Key words: Shiqiantan Formation, Shiqiantan sag, marine source rocks, accumulation mode, exploration prospect, eastern Junggar Basin

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