Lithologic Reservoirs ›› 2018, Vol. 30 ›› Issue (3): 43-51.doi: 10.12108/yxyqc.20180306

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Influences of soluble organic matter on reservoir properties of shale

CAO Taotao1, DENG Mo2, LIU Hu3, SONG Zhiguang4, CAO Qinggu2, HUANG Yanran1   

  1. 1. Hunan Provincial Key Laboratory of Shale Gas Resource Utilization, Hunan University of Science and Technology, Xiangtan 411201, Hunan, China;
    2. Wuxi Research Institute of Petroleum Geology, Sinopec, Wuxi 214126, Jiangsu, China;
    3. Sichuan Key Laboratory of Shale Gas Evaluation and Exploration, Chengdu 600091, China;
    4. Guangzhou Institute of Geochemistry, Chinese Academy of Sciences, Guangzhou 510640, China
  • Received:2017-11-25 Revised:2018-01-04 Online:2018-05-21 Published:2018-05-21

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Abstract: Soluble organic matter is an important part of organic matter. In order to study the effect of soluble organic matter on shale reservoir properties, the shales of Longmaxi Formation and Dalong Formation in northeastern Sichuan Basin were analyzed in the aspects of TOC content, rock pyrolysis, scanning electronic microscope, scanning electron microscopy combined with argon ion polishing, and the extraction of soluble organic matter and low-pressure N2 and methane adsorption experiments were carried out. The results show that: (1)Soluble organic matters are mainly existing in the surface and meso-macropore of kerogen, clay minerals and framboid pyrites in shales, especially low-maturity shales. (2)The specific surface area and methane adsorption capacity of extracted shale samples increased obviously compared with raw shale samples from Dalong Formation,while there are no obvious changes of specific surface area and methane adsorption capacity between the extracted shale samples and raw shale samples from Longmaxi Formation, indicating that the soluble organic matters in low-maturity shales could hinder the connectivity of pores and decrease methane adsorption capacity,but it has no obvious effect of soluble organic matter on high-maturity shales due to a low content of soluble matter in these shales. (3)Soluble organic matter content has a significant negative correlation with fractal dimension for Dalong shales,but has a positive correction for Longmaxi shales, indicating that soluble organic matter has an opposite effect on the pore heterogeneity for these two sets of shales with different maturities. (4)After extracting the soluble organic matter, fractal dimension values has a decreasing phenomenon for both extracted Dalong and Longmaxi shales, suggesting that the connectivity and uniformity of the pores are improved due to removing the soluble organic matter existing in shale pores. Therefore, through this study, soluble organic matter is deemed to an important factor of reservoir properties of shale,and it should be taken into consideration when characterizing the physical properties of the low-maturity shales.

CLC Number: 

  • TE122.2
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