Oil & Gas Geology ›› 2022, Vol. 43 ›› Issue (1): 34-42.doi: 10.11743/ogg20220103

• Petroleum Geology • Previous Articles     Next Articles

A new trap type: Fault-controlled fracture-vuggy trap

Lu Yun(), Xiuxiang Zhu   

  1. Northwest Oilfield Company,Sinopec,Urumqi,Xinjiang 830011,China
  • Received:2021-09-13 Revised:2021-12-14 Online:2022-02-01 Published:2022-01-28

Abstract:

Sinopec Northwest Oilfield Company recently struck a billion ton-scale oil/gas discovery-the Shunbei oil and gas field-in the deep carbonates of Shuntuoguole low-uplift, Tarim Basin. A new trap type-fault-controlled fracture-vuggy trap-is found to be the major container for oil and gas in the field. Analyses show that the traps take the fracture-vuggy layers along strike-slip fault zone as reservoirs and the overlying mudstone and local tight carbonates as caprocks. The reservoirs are probably the result of a tectonic disruption of the Middle-Lower Ordovician carbonates under strike-slip faulting that induced the formation of a large number of fractures, vugs and caverns. Based on the style and fragmentation of strike-slip faults as well as the distribution of internal reservoirs in the field, this study classifies the traps into four sub-types: transpression type, translation type, transtension type and composite type. This new type of trap further enriches the theory of marine carbonate reservoirs for oil and gas and provides a scientific basis for future exploration and development in deep and ultra-deep carbonates.

Key words: fault-controlled fracture-vuggy type, hydrocarbon trap, carbonate, Ordovician, Shunbei oil/gas field, Tarim Basin

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