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Extensional folds and their control effect on oil and gas accumulation:A case study from Beizhong sub-depression in Hailar Basin

ZHANG Ying   

  1. Research Institute of Exploration and Development， PetroChina Daqing Oilfield Company Ltd.， Daqing 163712， China
  • Online:2012-04-20 Published:2012-04-20

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Abstract:

Beizhong sub-depression is one of the richest oil and gas tectonic units in the Hailar Basin, and it experienced three stages, including rift period, rift-depression period and depression period, which shaped a current complex structure. The west fault-step belt, the east fault-step belt and the lowuplift belt of subsag comprised a typical longitudinal isostatic extensional fold. The actions of extensional stress and gravity created secondary structural styles in the extensional fold, such as tilted faulted-block and slide faulted-ramp. Extensional folds provide important structure of oilgas for extensional basins. The favorable traps and sedimentary facies related to extensional folds can accelerate the accumulation of oil and gas. Extensional folds play an important role in controlling oil and gas accumulation in Beizhong
sub-depression. Its role mainly embodies two respects: the center lowuplift belt is a multiple oil and gas accumulation zone; while the slide faulted-ramp near boundary faults is favorable for oil and gas accumulation.

Key words: petroleum preservation condition, coupling area between mountain and basin, Longmen Mountain, Sichuan Basin

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