石油与天然气地质 ›› 2022, Vol. 43 ›› Issue (5): 1102-1114.doi: 10.11743/ogg20220508

• 油气地质 • 上一篇    下一篇

川东红星地区上二叠统吴家坪组页岩发育特征及其页岩气富集意义

王鹏威1(), 刘忠宝1, 李雄2, 刘皓天2, 周林2, 肖雄2, 王濡岳1, 李鹏1   

  1. 1.中国石化 石油勘探开发研究院,北京 102206
    2.中国石化 江汉油田分公司,湖北 武汉 430007
  • 收稿日期:2021-10-28 修回日期:2022-07-29 出版日期:2022-10-01 发布日期:2022-09-02
  • 第一作者简介:王鹏威(1986—),男,博士、副研究员,非常规油气地质。E?mail: wangpw.syky@sinopec.com
  • 基金项目:
    中国石油化工股份有限公司科技攻关项目(P22137)

Development of the Upper Permian Wujiaping shale in Hongxing area, eastern Sichuan Basin, and its significance to shale gas enrichment

Pengwei Wang1(), Zhongbao Liu1, Xiong Li2, Haotian Liu2, Lin Zhou2, Xiong Xiao2, Ruyue Wang1, Peng Li1   

  1. 1.Petroleum Exploration and Production Research Institute,SINOPEC,Beijing 102206,China
    2.Exploration and Production Research Institute of Jianghan Oilfield Company,SINOPEC,Wuhan,Hubei 430007,China
  • Received:2021-10-28 Revised:2022-07-29 Online:2022-10-01 Published:2022-09-02

摘要:

川东红星地区上二叠统吴家坪组海相富有机质页岩是四川盆地页岩气勘探的重要接替领域,目前处于勘探初级阶段,页岩发育特征及页岩气勘探前景尚不清楚。以HY1井为例,通过岩石学、地球化学、储层描述和含气性等分析测试研究了川东红星地区吴家坪组页岩源、储品质及其变化规律,探讨了页岩气勘探前景。结果表明:富有机质页岩发育于吴一1亚段(吴家坪组一段1亚段)潮坪-潟湖环境和吴二段深水陆棚环境,吴一1亚段主要发育粘土质页岩相,吴二1亚段主要发育混合页岩相和硅质页岩相,吴二2亚段以硅质页岩相和灰质页岩相为主。与吴一1亚段潮坪-潟湖相页岩相比,吴二段混合页岩相和硅质页岩相具有脆性矿物含量高(63.2 %)、有机质丰度高(总有机碳含量为8.78 %)、有机质类型好(Ⅱ1型)、储层有机质孔发育且物性好(孔隙度为5.59 %)的特征,吴二1亚段富有机质页岩是红星地区吴家坪组页岩气勘探的有利层段。

关键词: 烃源岩品质, 储层品质, 深水陆棚, 页岩, 吴家坪组, 上二叠统, 红星地区, 四川盆地

Abstract:

The Wujiaping marine shale of the Upper Permian in the eastern Sichuan Basin is an important successor for shale gas exploration in the Sichuan Basin, where shale gas enrichment conditions and favorable exploration intervals are yet to be clarified. The study investigates source rocks and reservoir quality of the Wujiaping shale in Well HY 1 and their changes in vertical via petrology and geochemistry analysis, reservoir description and characterization as well as gas-bearing potential test, and the exploration prospects are thereby identified. Results show that the organic-rich shale is developed in the first sub-member of the first member of the Wujiaping Formation (Wu11) of tidal flat-lagoon facies and the second member (Wu2) of deep shelf facies. To be specific, the Wu11 is dominated by argillaceous shale, Wu21 bymixed siliceous shale and siliceous shale, and the Wu22 by siliceous shale and calcareous shale. Compared with the argillaceous shale in the Wu11, the mixed siliceous and siliceous shale in the Wu2 is characterized by high brittle mineral content (63.2 %), high organic matter abundance (TOC = 8.87 %), favorable organic matters (Type Ⅱ1), well-developed organic pores, and good physical properties (a porosity of 5.59 %). Among others, the source rock quality and reservoir capacity of the Wu21 are better than those of the Wu22. It can be concluded that the organic-rich shale of the Wu21 is favorable for shale gas exploration in the study area.

Key words: source rock quality, reservoir quality, deep shelf facies, shale, Wujiaping Formation, Upper Permian, Hongxing area, Sichuan Basin

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