Lithologic Reservoirs ›› 2014, Vol. 26 ›› Issue (5): 69-74.doi: 10.3969/j.issn.1673-8926.2014.05.013

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Influence of pore structure on reservoir quality of low permeability sandstone reservoir: A case study from Chang 8 oil reservoir set in Jiyuan area, Ordos Basin

CAI Yue 1,2，XIONG Qi1，LI Yong 1,2，DING Yingchao1，XU Wenjie1   

  1. 1. School of Earth Science and Resources， Chang’an University， Xi’an 710054， China； 2. Laboratory of Mineralization and Dynamics， Chang’an University， Xi’an 710054， China
  • Online:2014-10-20 Published:2014-10-20

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Abstract:

Based on conventional constant-pressure mercury injection, cast image, scanning electron microscopy and slice observation, combined with constant-speed mercury injection, this paper studied the microscopic pore structure and its influence on reservoir quality of Chang 8 low permeability sandstone reservoirs in Jiyuan area. The result shows that Chang 8 reservoirs developed various pore types and the pore structure can be divided into four categories. The average pore-throat radius, median pore-throat radius, sorting coefficient and maximum mercury saturation have a positive correlation with reservoir properties, have a negative correlation with structure coefficient, and have little correlation with average coefficient, skewness and mercury withdrawal efficiency. Constant-speed mercury injection test further shows that physical properties of Chang 8 low permeability reservoir have little correlation with pore parameters, and reservoir quality are mainly controlled by throat. In the process of low permeability reservoir development, we should protect the throat effectively to achieve better development effect.

Key words: diffusion filtering, noise suppression, seismic data interpolation, wavefield separation, seismic exploration

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