渤海湾盆地渤中凹陷油藏断裂特征及对成藏的控制作用

doi:10.11743/ogg20170107

Abstract

Abstract:

The Bozhong Sag is not only the depocenter of the Bohai Bay Basin,but also an important oil/gas-bearing sag in the Bohai Bay Basin.The reservoirs surrounding the Bozhong Sag are mostly fault-controlled structural or structural-lithological reservoirs.The patterns and degrees that these faults control on petroleum reservoirs directly determine the evaluation of structural traps and exploration strategy.By detailed structural characterization of 237 petroleum reservoirs with shallow to medium depth in the Bozhong Sag,this paper statistically analyzed multiple parameters,e.g.,faulting classification,faulting mechanism,fault throw,faulting activity,fault strike/dip,combination styles,plain view geometry,screening types,SGR,etc.Our study suggested that,with proper assemblage of primary faults and minor faults,faulting characteristics contributing to petroleum accumulation includes:striking NNE or EW/NE,dip angle of 66°-80°,fault throw of 20-150 m,faulting rate of 10-30 m/Ma,SGR > 0.3,R_m > 0.35,multiple assemblage styles (e.g.,oblique crossing,en echelon,Y-shape,semi-flower and stepwise faults) and antithetic screening.In plain view,it is more favorable for hydrocarbon accumulation in positions where faults are intersecting and convex section.In general,fault sealing property is the key factor controlling hydrocarbon accumulation in structural traps.The fault sealing property is determined by faulting rate,scale and fault types.

Key words: hydrocarbon accumulation, fault sealing property, controlling factor, fracture, Bozhong Sag, Bohai Bay Basin

CLC Number:

TE122.1

Wang Guanmin, Xiong Zhouhai, Zhang Jian, Guo Yonghua, Lin Guosong, Fu Yao. Characterization of fault system and its control on reservoirs in the Bozhong Sag, Bohai Bay Basin[J]. Oil & Gas Geology, 2017, 38(1): 62-70.

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Characterization of fault system and its control on reservoirs in the Bozhong Sag, Bohai Bay Basin

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