Microscopic Pore Characteristics and Its Influence Factors of the Permian Longtan Formation Shales in the Southern Sichuan Basin

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  • 1.State Key Laboratory of Coal Resources and Safe Mining,China University of Mining and Technology(Beijing),
    Beijing 100083,China;2.College of Geosciences and Surveying Engineering,China University of Technology(Beijing),
    Beijing 100083,China; 3.State Key Laboratory of Petroleum Resource and Prospecting,China University of Petroleum
    (Beijing),Beijing 102249,China; 4.College of Geosciences,China University of Petroleum(Beijing),Beijing 102249,China

Received date: 2015-04-20

  Revised date: 2015-05-22

  Online published: 2015-08-10

Abstract

In order to evaluate the marine-terrestrial shale gas reservoir in coal measures,the morphologic development characteristics and structure of microscopic pores in shale samples from the Permian Longtan Formation in the southern Sichuan Basin were studied,and their major influencing factors of shale pores are analyzed in this paper,by using scanning electron microscope(SEM),high-pressure mercury injection,low-temperature liquid nitrogen absoption and carbon dioxide absoption.The results show that there are many kinds of reservoir spaces,such as intergranular pores,dissolution pores and organic pores.The main pores are in circular,oval,triangular,and irregular shapes.These microscopic pores provide reservoir space for shale gas.The nano-scale pores in the Longtan Formation shale samples are dominated by micropores and mesopores.Both micropores and mesopores provide with 56.2% volume and over 80% specific surface area of total pores,and they are favorable for shale gas accumulation.There is a positive correlation between pore volume and specific surface area,and the relation between BJH volume,DFT volume and specific surface area is better.The pore structure is mainly with plate slit type,cylindricity,and mixed types.The pore aperture is mainly distributed in 0.4-1nm,3-30nm,and averaged at 4.66nm.All the organic carbon content,maturity(RO) of organic matter and clay minerals are certain favorable for the development of reservoir pores,while the content of brittle minerals has the opposite relation to it.

Cite this article

ZHANG Ji-zhen,LI Xian-qing,GUO Man,DONG Ze-liang,WANG Zhe,FU Qing-hua,WANG Fei-yu . Microscopic Pore Characteristics and Its Influence Factors of the Permian Longtan Formation Shales in the Southern Sichuan Basin[J]. Natural Gas Geoscience, 2015 , 26(8) : 1571 -1578 . DOI: 10.11764/j.issn.1672-1926.2015.08.1571

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