Hydrocarbon accumulation models and their controlling over hydrocarbon distribution of main central depression zones of central Haita Basin

Through reservoir anatomy and spatial matching of hydrocarbon accumulation conditions,we study reservoir types,hydrocarbon accumulation models and their controlling over hydrocarbon distribution of main central depression zones of Haita Basin.it was considered that types of reservoirs are mainly antithetic fault screened,disconfromity screened,small anticline,lithology uplift pinchout,sand lens and paleo-buried hills.Hydrocarbon accumulation models are hydrocarbon accumulated in composite traps of reverse fault tilting uplift,composite traps of uplift in low-lying land,lithology traps in low-lying land,buried hills traps of paleo-uplift bedrock and tectonic traps of reverse tectonic.Hydrocarbon accumulation models controlling over hydrocarbon distribution are showed in reverse fault tilting uplift in source area,uplift in low-lying area and lithology traps in low-lying area are favorable areas of Nanyi member,Tongbomiao group and part of Naner member.Reverse tectonic connected by long-time fault is favorable area for hydrocarbon accumulation of Damoguaihe group and Naner member;paleo-uplift laterally connected with source rock of Nanyi member is the favorable area for hydrocarbon accumulation of bedrock buried hills.