Lithologic Reservoirs ›› 2013, Vol. 25 ›› Issue (6): 25-29.doi: 10.3969/j.issn.1673-8926.2013.06.005

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Characteristics of tight sandstone reservoir of Chang 4+5 oil reservoir setin Yan’an area, Ordos Basin

YANG Jie   

  1. Yongning Oil Production Plant， Yanchang Oilfield Corporation， Yan’an 716000， China
  • Online:2013-11-26 Published:2013-11-26

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Abstract:

According to the data of rock thin section, cast thin section, scanning electron microscope, X diffraction of clay minerals, high pressure mercury and properties analysis, this paper studied the characteristics of tight sandstone reservoir of Chang 4+5 oil reservoir set in Yan’an area. The results show that the rock type of Chang 4+5 sandstone reservoir is mainly fine-grained feldspar sandstone; porosity and permeability range from 6.0% to 10.0% and 0.2 mD to 2.0 mD respectively, and the reservoir belongs to typical tight sandstone reservoir; reservoir space is mainly residual intergranular pores, followed by dissolved pores in feldspar and laumontite; pore structure is dominated by small pore and fine throat type, followed by fine throat and pore tiny throat type; compaction and cementation in chlorite, calcite and laumontite are the main factor for causing poor reservoir properties, and dissolution improves reservoir properties. The results of this study provide a geological basis for rolling exploration and development for Chang 4+5 oil reservoir set in Yan’an area.

Key words: tight sandstone, reservoir characteristics, natural gas, Permian, Ordos Basin

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