Micro-structure Evaluation of Shale Gas Reservoir Based on Fractal Theory

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  • 1.Research Institute of Petroleum Exploration & Development,PetroChina,Beijing 100083;
    2.Exploration and Development Institute of Southwest Oil & Gasfield Company,PetroChina,Chengdu 610041,China;
    3.Research Institute of Petroleum Exploration and Development-Langfang,PetroChina,Langfang 065007,China

Received date: 2014-09-25

  Revised date: 2014-11-04

  Online published: 2015-04-10

Abstract

Micro-structure evaluation of shale gas reservoir is the basis of shale gas exploration and development.High-pressure mercury injection and the calculation principle of fractal dimension of porous structure are employed to study the pore structure of shale and the pore structure parameters can also be obtained.The results of high pressure mercury injection show that the core diameter is mainly in the range of 3-18nm,and the micropores and transitional pores are the main pore in shales.Micropore is the primary contributor to specific surface area and functions as the main adsorption space.The fractal dimension analysis results show that the fractal distribution of shales can be obviously divided into two sections: the fractal dimension of transitional pores,mesopores and macropores is close to 3,which indicate that this part of the pore is strongly heterogeneous and the distribution of pore structure is uneven.The fractal dimension of micropores is less than 1.The result is mercury injection experiment cannot describe the pores with a diameter less than 3nm,and the pore structure evaluation of micropores is not comprehensive enough,so that the fractal dimension is beyond the scope of theory.

Cite this article

WANG Xin,QI Mei,LI Wu-guang,HU Yong-le,LIU Jia,ZHAO Kai . Micro-structure Evaluation of Shale Gas Reservoir Based on Fractal Theory[J]. Natural Gas Geoscience, 2015 , 26(4) : 754 -759 . DOI: 10.11764/j.issn.1672-1926.2015.04.0754

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