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Genesis analysis of abnormal overpressure in Bashituo structure,Tarim Basin

Yu Qi-xiang1,Yu Feng-hua2,Shi Zheng1   

  1. 1.Wuxi Petroleum Geology Institute,Research Institute of Petroleum Explorationand Production,SINOPEC,Wuxi 214126,China;
    2.Taizhou University,Taizhou 225300,China
  • Received:2017-02-22 Revised:2017-06-12 Online:2017-07-10 Published:2017-07-10

Abstract:

Abnormal overpressure hydrocarbon reservoir is major target of petroleum exploration in unmodified forland region of Tarim Basin,and the abnormal overpressure hydrocarbon reservoir was discovered in Donghetang Formation,Bachu Formation,Xiaohaizi Formation and Nanzha Formation at Bashituo structure.We discussed the characteristic and genesis of thess reservoir based on the drilling and logging data,oil and gas production test data,clay mineral content,break through pressure,specific surface area,showing that the Carboniferous-Permian was at the late diagenesis stage,and the important factors of abnormal overpressure were dewatering of clay mineral,gas charging and the uncompacted belt.High salinity sealing water,the Ⅰ and Ⅱ mud rock and gypsum cap with hith breakthrough pressure were the necessary condition of the formation of Bashituo structure.

Key words: Abnormal overpressure, Genesis analysis, Bashituo structure, Maigaiti slope, Tarim Basin

CLC Number: 

  • TE121
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