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Organic rich shale pore characteristics of Western Sichuan Depression
WU Wei1, LIU Weiqing1, TANG Xuan2, ZHOU Xueqing3, ZHENG Wei1, SONG Dangyu1
(1.School of Resources and Environment, Henan Polytechnic University, Jiaozuo 454003, China;2.School of Energy Resources, China University of Geosciences, Beijing 100083, China;3.Geophysics and Oil Resource Institute, Yangtze University, Wuhan 430100, China)
Abstract:
The pore characteristics of the organic rich shale in Western Sichuan Depression were studied by using low temperature nitrogen adsorption method and field emission scanning electron microscopy. The results show that the surface area of organic rich shale in Western Sichuan Depression ranges from 3.404 m2/g to 19.473 m2/g, which is far more than that of conventional reservoir. The surface area of shale is mainly provided by micropore and transition pore. The shale develops a series of continuous porosity from micropore to mesoporous. The average pore diameter ranges from 3.06 nm to 7.82 nm. The pore types are mainly parallel-plate pore and blind pore, which is closed at one end with certain amounts of ink-bottle pore at the same time. The surface area of shale and content of organic carbon form positive correlation. The content of organic carbon and degree of thermal evolution are negatively correlated with aperture. Lastly fragile mineral such as quartz is weak positively correlated with surface area.
Key words:  pore structure  pore type  nitrogen adsorption  Western Sichuan Depression