地学前缘 ›› 2023, Vol. 30 ›› Issue (2): 282-295.DOI: 10.13745/j.esf.sf.2022.2.72

• 成藏-成矿作用与评价 • 上一篇    下一篇

燕山构造带东段中生界盆地页岩油气地质研究现状与展望

牟汉生1(), 薛欣宇2, 姜在兴2   

  1. 1.中国石化东北油气分公司, 吉林 长春 130062
    2.中国地质大学(北京) 能源学院, 北京 100083
  • 收稿日期:2021-12-14 修回日期:2022-01-02 出版日期:2023-03-25 发布日期:2023-01-05
  • 作者简介:牟汉生(1968—),男,博士,从事石油地质勘探研究工作。E-mail: hsmu.sipc@sinopec.com
  • 基金资助:
    国家科技重大专项(2017ZX05009-002)

Shale oil and gas in the Mesozoic Basins, eastern Yanshan Orogenic Belt—exploration status and outlooks

MU Hansheng1(), XUE Xinyu2, JIANG Zaixing2   

  1. 1. Northeast Oil & Gas Branch of Sinopec, Changchun 130062, China
    2. School of Energy Resources, China University of Geosciences (Beijing), Beijing 100083, China
  • Received:2021-12-14 Revised:2022-01-02 Online:2023-03-25 Published:2023-01-05

摘要:

中国陆相盆地页岩油资源丰富,是我国未来油气增储上产的重要战略接替领域。燕山构造带东段(辽西地区)中生界盆地群页岩油气资源丰富,但尚处于油气勘探空白区,落实其勘探前景势成必然。基于研究区勘探的实际情况,并通过与国内外典型页岩油气盆地石油地质条件对比,综合沉积体系以及烃源岩地球化学参数分析等,明确了燕山构造带东段中生界盆地群页岩油气的资源潜力。研究结果表明:(1)下侏罗统北票组和下白垩统九佛堂组均发育连续厚层的暗色泥页岩,为主力烃源岩层位;(2)烃源岩的总有机碳(TOC)含量均值为1%~4%,以II1型或II2干酪根为主,且指示热演化成熟度的镜质体反射率(Ro)普遍高于0.6%,具有良好的油气潜力;(3)两套烃源岩层系均富含火山碎屑成分,脆性矿物含量较高,具有良好的可改造性。针对陆相含油气盆地页岩油气勘探存在的问题,首先讨论了赋存页岩油气重要载体的碳酸盐质细粒沉积岩的多源成因机制与油气富集类型,其中研究区以火山热液型和混源型甜点为主;另外探讨了火山-湖泊作用对有机质的富集效应,认为火山灰的输入提升了有机质的富集效力。同时,根据以往的勘探实践经验,提出原型盆地恢复技术和“天-地-钻”三位一体技术是解决复杂造山带油气勘探(特别是密植山区)中面临的诸多问题的关键。

关键词: 燕山构造带, 辽西, 陆相页岩油气, 细粒沉积, 火山作用, 原型盆地

Abstract:

Continental basins in China possess abundant shale oil and gas resources and are an important strategic successor area for increasing oil and gas reserves and production in the future. The Mesozoic basin group in the eastern section of the Yanshan Orogenic Belt (western Liaoning) has rich yet unexplored shale oil and gas resources, therefore, petroleum prospecting in this area has become inevitable. Through field exploration and comparisons of basin’s geological conditions with that of typical domestic and foreign shale oil and gas basins, combined with comprehensive analysis of geochemical parameters for sedimentary systems and source rocks of the area, the shale oil and gas resource potential of the Mesozoic basin group is evaluated. The results show that (1) the Beipiao Formation of the Lower Jurassic and the Jiufotang Formation of the Lower Cretaceous are the main source rocks, with the extensive developments of thick and dark shales. (2) The source rocks are dominated by type II1/II2 kerogen; their total organic carbon (TOC) content is 1%-4% on average, and vitrinite reflectance (Ro), an indicator of source rock thermal maturity, is generally higher than 0.6%, indicating good petroleum generation potential. (3) The two sets of source rocks are both rich in volcanic clastic components, with high content of brittle minerals, and have good transformability. In view of the problems in shale oil and gas exploration in continental petroliferous basins, the multi-source genetic mechanism and oil and gas enrichment types of carbonate fine-grained sedimentary rocks, an important carrier of shale oil and gas, are first discussed, which suggests that volcanic hydrothermal fluids and mixed-source “sweet spot” are the main enrichment types in the study area; then the enrichment effect of volcano-lake interaction on organic matter is discussed, which indicates the volcanic ash input enhances the enrichment efficiency of organic matter. Meanwhile, based on previous exploration experience, it is proposed that the prototype basin restoration technology and the “space-earth-drilling” trinity technology are the key to solving many problems in the oil and gas exploration of complex orogenic belts (especially densely planted mountainous areas).

Key words: Yanshan Orogenic Belt, western Liaoning, lacustrine shale oil and gas, fine-grained sedimentation, volcanic effects, prototype basin

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