Lithologic Reservoirs ›› 2020, Vol. 32 ›› Issue (1): 1-10.doi: 10.12108/yxyqc.20200101

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Key factors for reservoir formation of large lithologic reservoirs in Shijiutuo uplift,Bohai Sea

WANG Deying, YU Ya, ZHANG Li, SHI Panpan   

  1. Bohai Petroleum Research Institute, CNOOC Tianjin Branch, Tianjin 300459, China
  • Received:2019-07-03 Revised:2019-09-03 Online:2020-01-21 Published:2019-11-22

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Abstract: In order to explore the dominant factors of hundred-million-ton lithologic reservoirs in Bohai Sea,based on three-dimensional seismic and drilling data,the sequence stratigraphic framework and the development characteristics of lithologic traps in extremely shallow water delta were analyzed. Combined with research and experimental simulation of late fault system,the reservoir-forming regularity,reservoir-forming model and main controlling factors of lithologic reservoirs were analyzed,and the key factors of reservoir-forming of hundred-millionton lithologic reservoirs were analyzed. A three-component reservoir control model of "ridge-fault-sand" was established. That is,the "convergent ridge" controls the dominant position of primary migration and accumulation of oil and gas,and determines the scale of oil and gas migration to shallow layer. "Ridge-fault" coupling controls the further migration of oil and gas to shallow layers,and "fault-sand" coupling controls the development of largescale lithologic traps and the degree of oil and gas filling. Under the guidance of this model,100 million tons of lithologic reservoirs of Neogene Minghuazhen Formation of QHD 33-1S have been discovered in the edge of QHD 33-1 small oil field in Shijiutuo old area. It is the first commercial discovery of lithologic reservoirs in Bohai Sea under the restriction of high economic threshold.

Key words: hundred-million-ton-level oilfield, lithologic trap, Minghuazhen Formation, Neogene, Bohai Sea

CLC Number: 

  • TE121.1
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