渤海湾盆地缓坡带类型及其油气分布特征

doi:10.11743/ogg20190202

Abstract

Abstract:

The ramp zone of the petroliferous basin is a favorable area for hydrocarbon accumulation.To identify the distribution of oil and gas in the ramp zones of various kinds is of great significance for oil and gas exploration.Taking the Bohai Bay Basin as an example,we divided its ramps into three types,namely the simple type,transitional type and complex type,based on the basement geometry of the ramps under the impact of tectonic zonation.The simple type of ramp zone is characterized by weak tectonic activity and one-way dipping basement geometry with a small dip; structural-litho-logic and lithologic reservoirs are dominant in this type,and its hydrocarbon enrichment concentrates in one single layer and most hydrocarbons accumulate in early periods with a typical "line-styled" hydrocarbon distribution.The transitional type features stronger tectonic movement and the two-way dipping basement geometry,and the structural and structural-lithologic reservoirs are dominant in this type,with a small number of stratigraphic reservoirs.Hydrocarbons enrich in multiple layers through migration along faults and sand body,resulting in a ladder-shaped reservoir distribution.While the complex ramp zone features strong tectonic activity and three-way dipping basement geometry.The structural and structu-ral-lithologic reservoirs are dominant,with a large number of stratigraphic reservoirs.The hydrocarbons enrich in multiple layers,leading to a "comb-shaped" reservoir distribution.

Key words: structural style, accumulation pattern, hydrocarbon distribution, ramp zone, Bohai Bay Basin

CLC Number:

TE122.1

Zhao Shan, Liu Hua, Jiang Youlu, Wang Yongshi, Hao Xuefeng, Zhang Cong. Ramp zone types and their hydrocarbon distribution characteristics in the Bohai Bay Basin[J]. Oil & Gas Geology, 2019, 40(2): 223-235.

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Ramp zone types and their hydrocarbon distribution characteristics in the Bohai Bay Basin

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