Reservoir Evaluation and Development ›› 2022, Vol. 12 ›› Issue (1): 119-129.doi: 10.13809/j.cnki.cn32-1825/te.2022.01.010

• Shale Gas • Previous Articles     Next Articles

Geological characteristic and its implications of shale exploration in Qijiang, Chongqing, China

GAO Yuqiao(),LIU Nana,ZHANG Peixian,HE Guisong,GAO Quanfang   

  1. Sinopec East China Oil & Gas Company, Nanjing, Jiangsu 210019, China
  • Received:2021-11-12 Online:2022-02-26 Published:2022-03-24

Abstract:

Detailed field description and experimental analysis have been carried out for Wufeng-Longmaxi Formation shale profile in Anwen Town, Qijiang, Chongqing, by field profile observations and field measurements. Three kinds of lithology formation, namely black siliceous shale of Wufeng Formation, dark gray shell argillaceous limestone of Guanyinqiao and black shale of Longmaxi Formation,are exposed from bottom to top in shale section of Anwen Town. There are three main conclusions. First, the exposed shale is the main formation of current exploration and development, the indicators of reservoir forming conditions are superior, TOC ranges from 1.10 % to 8.10 %, with an average of 3.40 %. The average Ro is 2.70 %; Quartz content ranges from 33.90 % to 56.60 %, with an average of 42.36 %, and clay content ranges from 18.00 % to 57.20 %, with an average of 42.62 %. Second, the main reservoir space types are microfracture, organic pore and inorganic pore. Third, combined with the exploration and development practice, the ①~③ subzone of black shale at the lower part of Wufeng-Longmaxi Formation is the sweet spot section, which is a favorable target of horizontal well.

Key words: geological characteristic, Wufeng-Longmaxi Formation, sweet spot section, Anwen Town, Chongqing

CLC Number: 

  • TE132