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Adsorption Characteristic and Influence Factors of Longmaxi Shale in Southeastern Chongqing

BI He,JIANG Zhen-xue,LI Peng,CHENG Li-jun,ZENG Chun-lin,XU Ye,ZHANG Ying-ying   

  1. 1.State Key Laboratory of Petroleum Resources and Prospecting,China University of Petroleum,
    Beijing 102249,China;2.Unconventional National Gas Institute,China University of Petroleum,
    Beijing 102249,China;3.Chongqing Institute of Geology and Mineral Resources,Chongqing 400042,China
  • Received:2013-07-26 Revised:2013-08-29 Online:2014-02-10 Published:2014-02-10

Abstract:

Adsorption gas in shale is the main component of shale gas.With different adsorption characteristics,shale in different areas has diverse influence factors.Therefore,it is significant to carry out further study on adsorption gas of shale for forecasting the shale gas content and evaluating the shale gas resource.Longmaxi  shale rich in organic matter develops greatly well in southeastern Chongqing.It is characterized by high maturity,shallow burial depth and wide distribution.In order to study the adsorption capacity and influencing factors of shale,shale cores from two wells are selected to do the organic carbon content,thermal maturity,X diffraction rock analysis,nitrogen gas adsorption experiment,scanning electron microscopy and isothermal adsorption experiments.Through the data,the relationship between adsorption capacity and pore structure,TOC,mineral composition,moisture content or pressure is figured out.Based on the results,the organic matter content is the key factor in affecting the adsorption capacity and the specific surface area is the fundamental factor to enhance the capacity.

Key words: Southeastern Chongqing, Longmaxi shale, Adsorption characteristic, Influence factors, Specific surface area

CLC Number: 

  • TE122.2

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