Lithologic Reservoirs ›› 2014, Vol. 26 ›› Issue (5): 75-79.doi: 10.3969/j.issn.1673-8926.2014.05.014

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Reasons of low yield of tight sandstone gas of He 8 member in eastern Ordos Basin

ZHAOHuitao1，2，WANG Huaichang1，2，L IU Jian1，2，DING Xuefeng3，L IU Yan1，2
  

  1. 1. Research Institute of Exploration and Development， PetroChina Changqing Oilfield Company， Xi’an 710018， China； 2. National Engineering Laboratory for Exploration and Development of Low-permeability Oil and Gas Fields， Xi’an 710018， China； 3. Department of Exploration， PetroChina Changqing Oilfield Company， Xi’an 710018， China
  • Online:2014-10-20 Published:2014-10-20

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Abstract:

 The reservoir of Neopaleozoic He 8 member in eastern Ordos Basin is characterized by low porosity, low permeability and low single well production, which restricts the large-scale development and submit scale of reserves, so it is necessary to study the characteristics of tight sandstone reservoir in this area and analyze the reason for the low yield of single well. By using cast thin sections, petrophysical analysis, high-pressure mercury injection, constant-speed mercury injection, gas water relative permeability, nuclear magnetic resonance and stress sensitivity experiment technology, this paper studied the characteristics of tight sandstone reservoir and the reasons of low yield of He 8 member in eastern Ordos Basin, and compared with Sulige Gas Field. The results show that the reservoir of He 8 member in the study area has poor properties, low content of rigid component, high content of plastic component, small pore throat radius and low movable fluid saturation. Strong stress sensitivity, great water lock damage and low gas permeability are the geological causes for the low yield of single well in the formation conditions.

Key words: shale oil, forming conditions, the seventh member of Dameigou Formation, northern margin of Qaidam Basin

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