Lithologic Reservoirs ›› 2011, Vol. 23 ›› Issue (4): 35-40.doi: 10.3969/j.issn.1673-8926.2011.04.007

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Control action of strike-slip faulting on hydrocarbon accumulation: A case study from Cenozioc fault in Qikou Sag

WANG Zhiyao1， SU Junqing1， QIAN Maolu1， LIU Zhiying2   

  1. 1. Exploration and Development Research Institute， PetroChina Dagang Oilfield Company， Tianjin 300280， China； 2. Well Logging Company， CNPC Bohai Drilling Engineering Company Limited， Tianjin 300280， China
  • Online:2011-08-20 Published:2011-08-20

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Abstract:

Qikou Sag in DagangOilfield formed at the right lateral tensor shear background in Cenozoic, and developed two groups of fault（NNE-NE and NNW-EWtrending）, accompanying echelon brush structure fault. The changes of strikeslip displacement caused by strike-slip faultingmake the extension rift faulting coexist with the compression uplift and result in that the depocenter moved from outside to inside of the sag, and uplift and erosion outside of the sag occur simultaneously, which forms the model of “uplift in sag” that is easy to form self-generation and self-accumulation reservoir. The faulted slope break belts formed by strike-slip faulting constitutes the palaeostructure units and sedimentary facies boundary, and dominates the general depositional system distribution. Based on the concept of depositional system tract in sequence stratigraphy, the sedimentary facies controlled by strike-slip fault is analyzed under one system tract. The favorable source-reservoir-cap assemblages in actic region, gentle slope and sub-depression of Qikou Sag are discussed. The result shows that strike-slip fault controls the forming of lithologic-structural traps.

Key words: diagenesis, Zhongyou Formation, Triassic, Tahe Oilfield

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