Journal of Jilin University(Earth Science Edition) ›› 2020, Vol. 50 ›› Issue (2): 662-674.doi: 10.13278/j.cnki.jjuese.20190130

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Relationship Between Shale Pressure System and Organic Pore Development of Wufeng-Longmaxi Formation in Marginnal Conversion Zone of Southeastern Chongqing Basin

Gao Yuqiao, Cai Xiao, He Xipeng, Wu Yanyan, Ding Anxu, Gao Hequn, Zhang Peixian   

  1. SINOPEC East China Oil and Gas Company Exploration and Development Research Institute, Nanjing 210011, China
  • Received:2019-06-26 Online:2020-03-26 Published:2020-03-31
  • Supported by:
    Supported by National Science and Technology Major Project (2016ZX05061) and Sinopec Ministry of Science and Technology Project (P18057-2)

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Abstract: Southeastern Sichuan basin and its marginal transition zone (hereinafter referred to as the basin-margin transition zone of SE Chongqing) is the focus of normal-pressure shale gas exploration in China. In order to understand the law of the shale gas enrichment in the southeastern Chongqing, to optimize the rough layers of horizontal well, and further guide the three-dimensional development and construction of the multi-layer system, the relationship between shale pressure system and the development of organic pores was studied by using the image quantitative characterization technology based on scanning electron microscope and the experimental analysis results of triaxial mechanics and liquid nitrogen adsorption. The results show that the organic pore size is small(1-30 nm) in the lower part of Wufeng-Longmaxi Formation shale,but the density of pore development is high(55.55-808.03 count/μm2). The organic pore size is high(30-50 nm) in the upper part,but the density of pore development is small(47.31-466.42 count/μm2). There is a significant positive correlation between pressure coefficient and roundness of organic holes. With the increase of fluid pressure in the pore, the pore will not be deformed by the overburden formation pressure, so that the pore can be better preserved. volume fractal dimension based on liquid nitrogen adsorption experiment show that the increase of fluid pressure in the pore can support the pore better, and ensure the difference of organic pore development is the common result of overburden formation pressure and pore fluid pressure. For the atmospheric pressure area, the pressure of overlying strata has important influence on pore development. For the overpressure zone, the increase of fluid pressure in the pore will slow down the deformation and disappearance of the pore. The realization of triaxial mechanics shows that the existence of Guanyinqiao Formation will increase the compressive strength of rock, thus forming a pressure partition in the vertical direction, resulting in the difference of pressure coefficient between the upper and lower layers, forming different subpressure systems, resulting in the difference of pore development characteristics.

Key words: shale, Wufeng-Longmaxi Formation, pressure system, organic pore, transition zone of basin margin in southeast Chongqing

CLC Number: 

  • P59
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