Advances in Earth Science ›› 2018, Vol. 33 ›› Issue (5): 493-505. doi: 10.11867/j.issn.1001-8166.2018.05.0493

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The Relationships Among Hydrocarbon-Pore-Surface in Shale Rocks and Their Significance for the Evaluation of Residual Hydrocarbons

Xu Li 1( ), Jingong Cai 1, *( ), Mingshui Song 2, Huimin Liu 2, Qing Liu 2, Zheng Li 2   

  1. 1.State Key Laboratory of Marine Geology, Tongji University, Shanghai 200092, China
    2.Research Institute of Petroleum Exploration and Development, Shengli Oilfield Company, SINOPEC, Dongying Shandong 257015, China
  • Received:2017-12-15 Revised:2018-03-24 Online:2018-05-20 Published:2018-06-13
  • Contact: Jingong Cai E-mail:lixu_0424@tongji.edu.cn;jgcai@tongji.edu.cn
  • About author:

    First author:Li Xu(1992-),male,Xuzhou City,Jiangsu Province,Ph.D student. Research areas include shale pore structure characteristics and shale oil and gas evaluation. E-mail:lixu_0424@tongji.edu.cn

  • Supported by:
    Project supported by the National Natural Science Fundation of China “Research on the separation and characteristics of different occurrence state hydrocarbon in shale”(No.41372130);The National Oil and Gas Special Fund “Organic-inorganic co-evolution and resource potential evaluation of Paleogene source rocks in Jiyang depression”(No.2016ZX05006001-003).

Xu Li, Jingong Cai, Mingshui Song, Huimin Liu, Qing Liu, Zheng Li. The Relationships Among Hydrocarbon-Pore-Surface in Shale Rocks and Their Significance for the Evaluation of Residual Hydrocarbons[J]. Advances in Earth Science, 2018, 33(5): 493-505.

Development of shale oil and gas has prompted people to think about the occurrence space and occurrence states of residual hydrocarbon in shale. There are three occurrence states of residual hydrocarbon in shale: free, adsorbed and dissolved. The contribution of different state hydrocarbon remains uncertain. The occurrence space for hydrocarbon includes pore and surface. Pore can be divided into macropore, mesopore, micropore; and surface can be distinguished between the external and internal surface. Filling and adsorption of hydrocarbon in/on different spaces vary a lot. Furthermore, characteristics of hydrocarbon and organic matter, and the burial and evolution process could complicate the relationships among hydrocarbon, pore and surface. In summary, research on residual hydrocarbon in shale must focus on occurrence state and space simultaneously. Rock-Eval pyrolysis and organic solvent extraction are effective quantitative methods for residual hydrocarbon evaluation, and calibration of characteristic parameters is of great significance. Union of N2 adsorption, mercury intrusion and EGME adsorption methods could achieve the pore structure characteristics of shale comprehensively. These quantitative evaluation methods are the basis for the research on relationships among hydrocarbon, pore and surface. This paper recommended progressively use of organic solvents and wet chemical oxidation methods which can separate free hydrocarbon, physical adsorption hydrocarbon and chemical bonding hydrocarbon gradually, and then we could establish the relationship among hydrocarbon, pore and surface by the combination of residual hydrocarbon and space quantitative characterization methods. Research on the interactions between hydrocarbon and minerals in molecular level and micro-scale will enrich the relationship among hydrocarbon, pore and surface, and it has great significance for us to understand the occurrence mechanism and flow characteristics of residual hydrocarbon in shale.

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