Oil & Gas Geology ›› 2018, Vol. 39 ›› Issue (5): 1056-1064.doi: 10.11743/ogg20180519

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Joint control of the Cenozoic faults and magma on hydrocarbon accumulation in BZ34-9 oilfield in Huanghekou Sag,Bohai Bay Basin

Yang Haifeng, Xu Changgui, Niu Chengmin, Yang Bo, Chen Lei, Guo Tao, Wu Jing, Su Wen   

  1. Tianjin Branch of CNOOC Ltd., Tianjin 300459, China
  • Received:2017-11-01 Revised:2018-07-17 Online:2018-10-28 Published:2018-09-06

Abstract: The study is based on integration of various data,such as regional geologic,3D seismic,well logging and geochemical data,as well as thin section and SEM observation.Its target is the key factors controlling hydrocarbon accumulation in the clastic rock reservoirs within the Cenozoic magma developing areas on the southern slope of the central low in Huanghekou Sag,Bohai Bay Basin.The result shows that the spatial and temporal coupling of fault activities and magma eruptions plays a pronounced role in controlling the hydrocarbon accumulation as follows:(1) the combination of fault and magma activities controls the formation of uplift zones on the slope and development of sizable traps; (2) the spatial and temporal coupling of faults and magma benefits the development of deeply buried Palaeogene clastic reservoirs of high quality;(3) the fault and magma jointly controls the differential hydrocarbon accumulation.Under the guidance of the cognition,a large and highly productive oilfield is discovered with reserves of nearly 80 million cubic meters and the highest single-well daily production in the oilfield is nearly 290 cubic meters.

Key words: fault and magma coupling, hydrocarbon accumulation, Huanghekou Sag, Bohai Bay Basin

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