LITHOLOGIC RESERVOIRS ›› 2015, Vol. 27 ›› Issue (5): 172-175.doi: 10.3969/j.issn.1673-8926.2015.05.028

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Hydrocarbon accumulation characteristics under the background of strike-slip faults in Shaleitian uplift, west Bohai Sea

Jiang Tao， Li Huiyong， Li Xinqi， Xu Peng， Hu Anwen   

  1.  Bohai Oilfield Research Institute ， Tianjin Branch of CNOOC Ltd. ， Tianjin 300452 ， China
  • Online:2015-09-26 Published:2015-09-26

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Abstract:

Based on 3D high resolution seismic data, combined with actual drilling data, the fault characteristics, depositional system characteristics and hydrocarbon accumulation model in Shaleitian uplift were studied. The result indicates that multiple sets of NE striking-slip faults are developed in the study area, which gradually converge to the main strikeslip faults to the deep, and the vertical fault throw is smaller without obvious horizontal displacement showing negative flower structure on profile. Meanwhile, the location of the strike-slip faults corresponds to “groove”, which controls the structural framework of the basement and caprock. The NE trending striking-slip faults plays important controlling roles on the formation of structural trap, the deposition of fan bodies and hydrocarbon accumulation. Structure ridge is a favorable zone for oil and gas accumulation. Affected by strike-slip motion, the main hydrocarbon migration and accumulation model in the east is different from the west. In the east, the slipping is relatively weak, and the hydrocarbon migration type is “structural ridge-fault-sand body” model with traps developing between strike-slip faults. In the west, the slipping is relatively strong, and the lateral hydrocarbon migration type is “gully filling sand-strike slip fault system” model with traps developing attach to the strike-slip faults.

Key words: organic-rich shales , geochemistry, hydrocarbon generation and thermal evolution, the second member of Kongdian Formation , Cangdong Sag , Huanghua Depression

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