LITHOLOGIC RESERVOIRS ›› 2015, Vol. 27 ›› Issue (1): 32-38.doi: 10.3969/j.issn.1673-8926.2015.01.005

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Reservoir forming conditions and exploration breakthrough of tight sandstone of Chang 9 member in Wangwazi area, Wuqi County

PANG Jungang1, WANG Guicheng1, SHI Yong2, LI Sai1, ZHU Penghui1   

  1.  1. School of Earth Sciences and Engineering , Xi ’ an Shiyou University , Xi ’ an 710065 , China ; 2. Xiasiwan Oil Production Plant , Yanchang Petroleum Company Limited , Yan ’ an 716000 , Shaanxi , China
  • Online:2015-02-03 Published:2015-02-03

Abstract:

 New discovery has been achieved in tight sandstone in the exploration of lower assemblage of Chang 9 member of Yanchang Formation in Ordos Basin. But the research of tight reservoir is still in the initial stage, and the lack of awareness seriously restrict the exploration and exploitation of tight reservoir. According to the data of well logging, well drilling and laboratory test, this paper discussed the forming condition, enrichment rule and exploration potential of the tight sandstone reservoir of Chang 9 member in Wangwazi area. The result shows that Chang 9 oil reservoir set has good reservoir forming conditions, several high-production wells have been found in Chang 91 and Chang 93 strata, and it has great breakthrough of petroleum exploration. The hydrocarbon source rocks, sedimentary microfacies, high quality sand bodies, nose-shaped structure are the key for exploration breakthrough of the tight sandstone reservoir of Chang 9 member. Based on comprehensive analysis, Wa 4, Wa 14 and Wa 11 well fields are favorable areas for further exploration.

Key words: seismic amplitude-preserved preprocessing, industrial interference, multi-frequency component, automatic identification and adaptive suppression, theoretical model analysis


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