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Pore Structure of Shales from High Pressure Mercury Injectionand Nitrogen Adsorption Method

YANG Feng,NING Zheng-fu,KONG De-tao,LIU Hui-qing   

  1. （MOE Key Laboratory of Petroleum Engineering in China University of Petroleum,Beijing 102249,China）
  • Received:2012-10-13 Revised:2013-01-23 Online:2013-06-10 Published:2013-06-10

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Abstract:

The pore structure of shales plays an important role in the evaluation of hydrocarbon content,gas exploration and development.However,there is little study on the pore structure of shales at home.High-pressure mercury injection and nitrogen adsorption experiments are employed to study the pore structure of shales and the pore structure parameters are also obtained.The effect of pore structure on gas adsorption and movement is analyzed.The results show that micropores and transitional pores are the main pore in shales,which provide the vast majority of pore volume.Micropore in the organic matter is the primary contributor to specific surface area and functions as the main adsorption space.The pore types are complicated and the pore morphology is diverse.There are airtight pores with a close end,air pores,and ink-bottle pores in shales and the pore connectivity is poor.The high content of micropore and transitional pore is beneficial for gas adsorption in shales,but the mesopore and macropore are backward,which goes against for shale gas seepage and production.

Key words: Shale, Pore structure, High-pressure mercury injection, Nitrogen adsorption, Pore volume, Specific surface area

CLC Number: 

  • TE135
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