Petroleum Reservoir Evaluation and Development >

2022 , Vol. 12 >Issue 1: 130 - 138

DOI: https://doi.org/10.13809/j.cnki.cn32-1825/te.2022.01.011

Shale Gas

Geological characteristics of shale in Wufeng-Longmaxi Formation of Bayu outcrop in Daozhen, northern Guizhou

  • Wei DU ,
  • Yongmin PENG ,
  • Shengxiang LONG ,
  • Haikuan NIE ,
  • Chuanxiang SUN ,
  • Talihaer YEERHAZI
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  • 1. State Key Laboratory of Shale Oil and Gas Enrichment Mechanisms and Effective Development, Beijing 100083, China
    2. Sinopec Key Laboratory of Shale Oil/Gas Exploration and Production Technology, Beijing 100083, China
    3. Sinopec Petroleum Exploration and Production Research Institute, Beijing 100083, China
    4. China University of Geosciences, Beijing 100083, China

Received date: 2021-07-13

  Online published: 2022-03-24

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Abstract

The upper Ordovician Wufeng Formation and the first member of the lower Silurian Longmaxi Formation are well exposed in Bayu outcrop Daozhen, northern Guizhou, with clear and complete stratigraphic boundaries. Under the control of global sea level changes, the Wufeng Formation and the first member of the Longmaxi Formation develop clay-bearing siliceous shale, siliceous shale, clay-bearing siliceous shale, argillaceous shale and silty shale from bottom to top, which display similar longitudinal superimposition characteristics to the Pengshui area on the edge of the Sichuan Basin and Jiaoshiba area in the basin. Lithology of the organic-rich shale in Wufeng Formation and the first member of the Longmaxi Formation in Bayu outcrop of Daozhen is dominated by clay-bearing siliceous shale and siliceous shale, which have the same organic matter enrichment features as that in the Pengshui and Jiaoshiba area. Specifically, TOC is positively correlated with the content of quartz, and negatively correlated with the content of clay minerals. The total thickness of organic-rich shale in the Wufeng Formation and the first member of the Longmaxi Formation at this profile is 26.1 m, which is lower than that in the Pengshui and the Jiaoshiba area, reflecting a relatively shallow-water depositional environment in the Daozhen area.

Key words： Bayu village in Daozhen; organic-rich shale; siliceous shale; shale gas; Wufeng-Longmaxi Formation

Cite this article

Wei DU , Yongmin PENG , Shengxiang LONG , Haikuan NIE , Chuanxiang SUN , Talihaer YEERHAZI . Geological characteristics of shale in Wufeng-Longmaxi Formation of Bayu outcrop in Daozhen, northern Guizhou[J]. Petroleum Reservoir Evaluation and Development, 2022 , 12(1) : 130 -138 . DOI: 10.13809/j.cnki.cn32-1825/te.2022.01.011

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