Lithologic Reservoirs ›› 2014, Vol. 26 ›› Issue (3): 79-83.

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Microscopic characteristics of Chang 7 tight sandstone reservoir in Ordos Basin

WANG Xiujuan1， WANG Minglei2， ZHAO Aibin1
  

  1. 1. PetroChina Changqing Oilfield Company， Xi’an 710018， China； 2. PetroChina Research Institute of Petroleum Exploration ＆ Development-Langfang， Langfang 065007， Hebei， China
  • Online:2014-06-06 Published:2014-06-06

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Abstract:

According to the characteristics of tight reservoir in Ordos Basin, based on FESEM, nanometer CT, rate controlled mercury penetration and NMR, this paper systematically studied the characteristics of reservoir pore, throat and the relationship between pore and throat. The result shows that the size of pores determines the reservoir capacity of tight oil reservoir, the average pore radius ranges from 15 μm to 20 μm, and the average pore volume is 0.05. The throat size is the main restricted factor for development cutoffs. The throat size ranges from 0.3 μm to 0.5 μm, and the throats ranging between 0.1 μm and 0.5 μm control 60% of movable fluid of reservoir. The reservoir with better physical properties exists in 30% to 40% big throat with better connectivity and the radius of throat is over 5 μm. The throat with radius of below 0.1 μm account for about 60% and connectivity is poor.

Key words: shale reservoir, micropore, scanning electron microscope, division of pore types, pore evolution

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