Shaleitian uplift is the most abundant area for Neogene hydrocarbon accumulation in the western Bohai Sea.In order to clarify the characteristics of strike-slip fault growth and their controls on hydrocarbon accumulation

the fault types and development characteristics were described in detail using high resolution 3-D seismic and core data

and the relationship between strike-slip faults and hydrocarbon play elements was also discussed.The results show that there are three types of strike-slip faults developed in the study area

namely the basement involved strike-slip faults

caprock strike-slip faults and extensional strike-slip faults.Various types of traps are formed within or between fault zones under the influence of different types of strike-slip faults.Among others

the large-scale drape anticline

fault-nose and faulted anticline traps are favorable traps

but the small-scale fault-block traps are adverse ones.Strike-slip faults control the formation and development of skeletal sand body and fault conduit systems

which are pathways for hydrocarbon expulsion and migration from mature source rocks from adjacent sags.High-angle fractures caused by strike-slip improve reservoir qualities such as permeability.Strike-slip faults widespread in the Neogene formations are the main factors controlling hydrocarbon accumulation in the study area.