Oil & Gas Geology ›› 2012, Vol. 33 ›› Issue (3): 353-363.doi: 10.11743/ogg20120304

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Shale gas accumulation conditions and play evaluation of the Devonian in Guizhong Depression

Wang Pengwan1, Chen Ziliao1, He Xunyun1,2,3, Dong Li4, Xu Zhengyu1, Ma Liqiao1, Dong Yong1, Huang Ling1   

  1. 1. Hangzhou Institute of Petroleum Geology, PetroChina Exploration and Development Research Institute, Hangzhou, Zhejiang 310023, China;
    2. Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing 100029, China;
    3. Graduate School, Chinese Academy of Sciences, Beijing 100049, China;
    4. SINOPEC Exploration & Production Research Institute, Beijing 100083, China
  • Received:2011-07-30 Revised:2012-04-20 Online:2012-06-28 Published:2012-07-10

Abstract:

A set of dark shales of intraplatform depression-deep shelf facies was deposited in Guizhong depression during the Devonian when the Guizhong depression experienced intracontinental rifting.Outcrop observation and integrated analysis of drilling and geochemical data indicate that the Middle-Lower Devonian shale in Guizhong depression feature in large thickness(the maximum cumulative thickness up to 1 000 m),high abundance of organic matter(TOC of 0.53%~9.46%),moderate thermal maturity(Ro of 1.33%~3.62%),well-developed micro-pores,nono-pores and micro-fractures,favorable clay mineral composition,moderate burial depth,and relatively good sealing conditions.All these characteristics reveal its high potential for shale gas exploration.Based on the shale gas exploration experiences of North American,in combination with the practice of marine shale gas exploration in south China, we put forward evaluation criteria for shale gas play.Paly evaluation results with these criteria show that the area to the west of Nandan-Xincheng-Mashan is a potential play for shale gas exploration in the Devonian in Guizhong depression.

Key words: hydrocarbon accumulation wndition, play, shale gas, Devonian, Guizhong Depression

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