The Law Of Oil And Gas Accumulation In The Buried Hill Of The Budat Oil Layer In The Suderte Oilfield And Favorable Well-Distributed Area

The Suderte Oilfield is located on the Suderte buried hill structural belt in the Hailar Basin,and the top of the Budat oil layer is mainly a NE-trending uplift structure.Due to the early formation of the buried hill strata of the Budat oil layer and the strong tectonic action in the later period,the formation was reformed in multiple stages,resulting in a weak understanding of the accumulation law of buried hill oil reservoirs,which seriously restricted the oil and gas exploration and development process in this area.The main purpose of this paper is to find out the top structural characteristics of the buried hill reservoir in the Budat oil layer of Sudert oilfield,and then determine the type of the buried hill reservoir.The main control factors of the reservoir are studied,the oil and gas accumulation model of the Budat buried hill and the favorable areas for oil and gas enrichment are clarified,and the production performance and experimental analysis of the development wells are combined to finally realize the potential of the well deployment in the study area.On the basis of regional structure and stratigraphic research,this paper uses drilling,logging and seismic data to study the oil and gas accumulation conditions of buried hills in Suderte Oilfield from three aspects: source rock oil supply conditions,storage conditions and blocking conditions.,combined with the vertical and horizontal distribution characteristics of oil and gas,summed up its oil and gas accumulation model,and finally identified favorable areas for accumulation and expansion potential.The research results and understandings obtained in this paper mainly include:(1)The types of faults on the top of Budat in the study area are all normal faults,mainly near-EW trending uplift structures,with 63 faults;(2)The types of oil reservoirs in the study area In order to construct oil reservoirs,the oil-water interface of each fault block on the plane is quite different.Each block has a relatively independent oil-water system.The general trend of the oil-water interface is that the east is high and the west is low.The buried hill oil and gas migration and transportation channels in the area are mainly composed of unconformity surfaces and faults,and there are three migration modes: "fault-step backflow type","faultbarrier one-way" and "fault-barrier two-way" :(4)The main controlling factors of accumulation in the study area are that oil source faults control the accumulation and distribution of oil and gas,and structural highs control the accumulation position of oil and gas.Finally,it is concluded that the lateral migration along the unconformity surface forms the top bedrock and top oil and gas reservoirs,and The oil and gas migrated by faults in the mountain can form fault-controlled oil and gas reservoirs,and the oil and gas migrated along the fault trend can accumulate in fractured areas to form fractured oil and gas reservoirs.There are 4 well potential areas,and 27 potential wells for external expansion have been confirmed,including 18 supplementary wells for external expansion at risk and 9 supplementary wells for low risk.