Lithologic Reservoirs ›› 2017, Vol. 29 ›› Issue (1): 51-58.doi: 10.3969/j.issn.1673-8926.2017.01.007

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Characteristics and influencing factors of Chang 8 tight sandstone reservoir of Triassic Yanchang Formation in Zhoujiawan area, Ordos Basin

WANG Weibin1,2, ZHU Jing1,2, MA Wenzhong1,2, FENG Shunyan1,2, LIU Yanni1,2, ZHAO Jing3   

  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. Xi'an Changqing Chemical Group Co., Ltd, PetroChina Changqing Oilfield Company, Xi'an 710018, China
  • Received:2016-08-12 Revised:2016-09-29 Online:2017-01-21 Published:2017-01-21

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Abstract: The characteristics and controlling factors of Chang 8 tight sandstone reservoir of Triassic Yanchang Formation in Ordos Basin is unclear,which restricts the hydrocarbon exploration and development in this area. Based on core observation and data of cast thin sections,scanning electronic microscope,mercury intrusion and conventional physical properties,the characteristics and influencing factors of the Chang 8 tight sandstone reservoir were analyzed. The results show that the Chang 8 reservoir rocks are mainly composed of lithic arkose and feldspathic lithic sandstones,with high content of matrix. The porosity of Chang 81 and Chang 82 sublayers are 8.03% and 8.17%,respectively,and the permeability are 0.17 mD and 0.25 mD,respectively, showing the poor properties and tight sandstone reservoirs. The pores are dominated by the remaining primary intergranular pores and secondary feldspar dissolved pores,together with small throat,which characterizes the Chang 8 reservoir with high expulsion pressure,high median pressure and low ejection efficiency. Under the control of deposition and diagenesis,the favorable reservoirs are mainly developed in distributary channel and subaqueous distributary channel. Compaction,carbonate and siliceous cementation make the reservoir properties poor,and dissolution improve the reservoir porosity and permeability.

CLC Number: 

  • TE121.2
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