Investigation of pore structure and fractal characteristics of marine-continentaltransitional shale in the east-central of Qinshui Basin

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  • 1.MOE Key Lab of Marine Reservoir Evolution and Hydrocarbon Enrichment Mechanism,China University of Geosciences,Beijing 100083,China;
    2.MOLR Key Lab of Shale Gas Resources Survey and Strategic Evaluation,China University of Geosciences,Beijing 100083,China;
    3.China University of Mining and Technology,Beijing 100083,China

Received date: 2016-09-26

  Revised date: 2017-01-08

  Online published: 2017-03-10

Abstract

To better understand the pore structure and fractal characteristics of marine-continental transitional shale in the east-central of Qinshui Basin,we collected 12 shale samples and performed a series of parallel experiments,including low-temperature nitrogen adsorption,scanning electron microscopy,total organic carbon content and X-ray diffraction analyses.The results show that the dominant minerals in the shale were clay minerals,followed by quartz.The average value of total organic carbon was 2.98% and kerogen in the shale samples is characterized by type Ⅲ.According to the N2 physisorption analysis,mesopores which significantly contribute to the pore volume and specific surface area were dominant in the marine-continental transitional shale samples.The pore in shale is fractal and the fractal dimensions were obtained from using the FHH model,named D1 and D2.There is a positive relationship between D1,D2 and clay minerals,in contrast,the impact of TOC on the fractal dimensions is relatively weak.There is a positive correlation between D1 and D2,indicating that both fractal dimensions can be used to characterize the pore structure and pore surface of the marine-continental transitional shale.More pore volume and specific surface area are always developed in shale with higher D1 and D2.However,the higher the D2,the more complicated of pore structure which is favorable for gas adsorption rather than gas transportation.Therefore,the higher the D1,the moderate the D2,the shale is favorable for gas storing-accumulating and exploitation.

Cite this article

Xi Zhao-dong,Tang Shu-heng,Li Jun,Li Lei . Investigation of pore structure and fractal characteristics of marine-continentaltransitional shale in the east-central of Qinshui Basin[J]. Natural Gas Geoscience, 2017 , 28(3) : 366 -376 . DOI: 10.11764/j.issn.1672-1926.2017.01.015

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