Reservoir fractal characteristics of continental shale: An example from Triassic Xujiahe Formation shale,Sichuan Basin,China

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  • Research Institute of Petroleum Exploration and Development,PetroChina,Beijing 100083,China

Received date: 2016-04-10

  Revised date: 2016-06-08

  Online published: 2019-09-11

Abstract

Based on the nitrogen isothermal adsorption and high pressure mercury intrusion data,the reservoir fractal characteristics of continental shale from Triassic Xujiahe Formation in the Sichuan basin are analyzed.The analytical results show the following characteristics.The porosity structure of Xujiahe Formation shale is complex,and nanoscale pore is the dominant space in the reservoir matrix space with pore size of 2-100nm.The pore structure of Xujiahe shale have significant fractal characteristics,and the fractal dimension ranges from 2.6 to 2.75 with an average of 2.66.It shows positive correlations between the fractal dimension and the total organic carbon (TOC) content,microporous pore volume,specific surface area,but without strong correlation minerals content in Xujiahe shale.Fractal dimension of shale increased with the degree of thermal evolution by periodic variation characteristics of “decreasing-increasing-decreasing”.It suggested that the fractal dimension distribution of high quality shale gas reservoirs ranges from 2.6 to 2.8,with a new way and method for quantitative reservoir characterization of continental shale and favorable area evaluation of shale gas.

Cite this article

Huang Jin-liang, Dong Da-zhong, Li Jian-zhong, Hu Jun-wen, Wang Yu-man . Reservoir fractal characteristics of continental shale: An example from Triassic Xujiahe Formation shale,Sichuan Basin,China[J]. Natural Gas Geoscience, 2016 , 27(9) : 1611 -1618 . DOI: 10.11764/j.issn.1672-1926.2016.09.1611

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