Hydrocarbon Accumulation Model Of Lei 64 Block In The Middle Section Of Eastern Steep Slope Belt In The Western Sag Of Liaohe Depression

The eastern steep slope belt in the western sag of Liaohe depression has favorable conditions for oil and gas accumulation,with multi-stage accumulation and three-dimensional accumulation system of multi-layer series.However,the exploration status of the sandy conglomerate is relatively low,which makes it difficult to expand the effective exploration in this region.Based on the analysis of regional geological background,this paper systematically combed the structural evolution and stratigraphic development characteristics of this region by using seismic,drilling logging,core and other data.Key single-well facies and well-connected facies profiles were selected to refine the distribution characteristics of sedimentary facies.Static analysis and dynamic analysis of oil and gas reservoirs are carried out for Lei 64 block.On the basis of reservoir analysis,physical simulation experiment of hydrocarbon accumulation was designed.Based on the theories and physical simulation results,we have revealed glutenite reservoir forming mode,set up glutenite reservoir accumulation model of Lei64 block which is located in the eastern steep slope belt of western sag,Liaohe depression,summarized the main controlling factors of hydrocarbon accumulation,predicted the favorable exploration zones.The results show that the accumulation model of Lei 64 block has the following characteristics: the reservoir is in the upper layer of the source rock;the hydrocarbon is transported vertically along the fault;lateral move and accumulate;single period accumulation.Faults and physical properties are the main controlling factors in this region.Moreover,faults and structures control the accumulation horizon of oil and gas,and physical properties control the hydrocarbon accumulation.It is predicted that the favorable exploration zone is concentrated in the center of the hydrocarbon source and its vicinity,and the middle section of fan-delta sandy conglomerate reservoir,located in the high structure layer and connected by the oil source fault is the favorable hydrocarbon accumulation area.