Research on Tectonic Control of Late Escape of Longmaxi Formation Shale Gas in Northeastern Chongqing

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Authors

  • Lin Zhou
     Exploration and Production Research Institute, SINOPEC, Jianghan Oilfield Company, Wuhan, Hubei 430 223 ,CN
  • Kun Zhou
     Northeast Sichuan Gas Field, Petro China Southwest Oil & Gas Field Company, Dazhou, Sichuan 635 000 ,CN
  • Xin Wang
     Oil and Gas Development Department of Center Tarim, Petro China Tarim Oilfield Company, Korla, Xinjiang 841 000 ,CN
  • Cunhui Fan
     School of Geoscience and Technology, Southwest Petroleum University, Chengdu, Sichuan 610 500 ,CN
  • Le Lv
     Northeast Sichuan Gas Field, Petro China Southwest Oil & Gas Field Company, Dazhou, Sichuan 635 000 ,CN

Keywords:

Shale Gas 1, Gas Escape 2, Gas Content 3, Longmaxi Formation 4, Northeast Chongqing 5.

Abstract

In northeastern Chongqing, the Longmaxi formation shale has experienced several tectonic uplifts of various scales during the geological evolution, hence forming shale gas enrichment zones featuring thrust fold belt. Based on field geology, drilling core characteristics observation and physical simulation experiment, and combined with methane isothermal adsorption experiment, this paper carries out a quantitative analysis on the variation rules of gas content during the late uplift of thrust belt in northeastern Chongqing, and discusses escape modes of Longmaxi formation shale gas by stages. The results show that the reservoir experiences two major tectonic uplifts after hydrocarbon generation ends, during which the changes in adsorption capacity are mainly affected by the combination of temperature and pressure. The content of adsorbed gas in the reservoir slightly increases, and the content of free gas decreases rapidly, thus the total gas content decreases. The simplified geological model and simulation restoration of tectonic burial history in northeast Chongqing are constructed. The shale remodelling in the study area is divided into four stages. The initial tectonic uplift amplitude was about 1,400m, and the total gas content was reduced; the second uplift amplitude was about 1,100m, and the total gas content was further reduced.

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Published

2022-10-22

How to Cite

Zhou, L., Zhou, K., Wang, X., Fan, C., & Lv, L. (2022). Research on Tectonic Control of Late Escape of Longmaxi Formation Shale Gas in Northeastern Chongqing. Journal of Mines, Metals and Fuels, 66(8), 423–430. Retrieved from https://informaticsjournals.co.in/index.php/jmmf/article/view/31730

Issue

Volume 66, Issue 8, August 2018

Section

Articles

License

Creative Commons License

This work is licensed under a Creative Commons Attribution-NonCommercial 4.0 International License.

 

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