The Oil And Gas Migration Pathway And Its Controlling Function Of Reservoir Forming Of K₁n In Surennuoer Area Of Wuerxun Depression

The Surennuoer area is located in the northern of the Wuerxun depression in the Hailaer Basin.It is the key area for oil exploration in Wuerxun,and the main target layer is k₁n.Due to the complexity of its geological conditions and the level of people's understanding,the oil and gas distribution law of k₁n in the Surennuoer area is unclear,which seriously affects the further exploration of oil and gas.In response to this problem,this paper analyzes the source rock,reservoir and caprock conditions of k₁n based on existing drilling,logging,earthquake and various analytical test data in the Surennuoer area,and uses 3D seismic data to study the type and distribution of oil source fractures of k₁n,by searching the spatial distribution of fault planes,studying the vertical migration path of oil source faults,using drilling data combined with oil and gas display characteristics to study the sand connectivity of k₁n,using the method of oil potential energy contours to find the convergence line,studies the lateral migration path of k₁n sand,and finally studies the control effect of k₁n oil and gas migration path on hydrocarbon accumulation and distribution through the relationship between oil and gas migration path and oil and gas distribution.The main research results and understandings obtained are:There are 22 vertical migration paths for the oil source faults of k₁n₁ in Surennuoer area,mainly distributed on F₁ and F₂ faults.The oil source faults of K₁n₂ develop a total of 19 vertical migration paths,which are also mainly distributed on the combined faults of F₁ and F₂,the vertical migration path of these oil source faults is the migration channel of the source rock from the k₁n₁ below to the sand above k₁n.There are 11 lateral migration paths of k₁n₁ in the Surennuoer area.Among them,five sand lateral migration paths are developed in the west,extending from south to north and there are two gathering places.Six lateral sand migration paths are developed in the east,one extending from north to south,and the remaining four extending from south to north with one gathering place.There are 9 lateral migration paths of sand in k₁n₂,in which 7 sand lateral migration paths are developed in the west,and 3 sand lateral migration paths extend from south to north,and 4 sand lateral migration paths extending from north to south,there is no gathering place.Two lateral migration paths of sand develop in the east,extending from west to east and transporting and converging.The k₁n oil and gas reservoirs in the Surennuoer area are faulty oil and gas reservoirs,mainly fault blocks and fault-lithologic reservoirs.The oil and gas in the eastern part of the plane is more concentrated than the oil in the west,and the oil and gas in k₁n₂ is more concentrated than that in k₁n₁.The controlling effect of the oil and gas migration path of k₁n in the Surennuoer area on hydrocarbon accumulation and distribution is mainly manifested in two aspects:?1?The fault trap of k₁n located near the vertical migration path of the fault is conducive to the accumulation of oil and gas.This is the primary reason for the oil and gas enrichment of the eastern part of k₁n in the Surennuoer area than that of the west;?2?The k₁n fault trap with a lateral migration path of less than 1000m is conducive to oil and gas accumulation;otherwise it is not conducive to oil and gas accumulation.The above research results can be used to guide oil and gas exploration in k₁n in the Surennuoer area.