Genesis and Control of Structural Style of Nanpu Depression in Bohai Bay Basin

There was a complex relationship between structural evolution and hydrocarbon accumulation in Nanpu Sag,the structural styles and their formation mechanism were not better understood.Based on the structural interpretation of 3D seismic data,two main geological cross sections with typical structural styles were selected,and a sectional sand-box physical simulation test was designed to analyze the evolutional sequences of the structural styles based on the test result.The results showed that crestal collapse structure of rollover anticline was developed near listric boundary faults while terrace or Domino-style fault arrays were developed in lsope zone,and the fault arrays were developed from slope to inner basin in sequence.The cabbage structure,which was not related with strike-slip movement was just the result of reactivity of early-base faults;the geometry and evolution of boundary faults controlled the development and distribution of sedimentary facies,therefore it influenced,the macro-distribution of hydrocarbon.It is concluded that the southern slope zone could be a prospective zone for hydrocarbon exploration and the local structural belts controlled by early-base faults should be most prospective targets of oil exploration.