Structural Characteristics And Reservoir Control Mechanism Of Fuyu Oil Layer In Western Anda Area In Northern Songliao Basin

Western Anda area is located in the north of Sanzhao Sag in the central depression of Songliao Basin and the southwest of western Anda area,which is rich in oil and gas resources and has important development and research value.Tectonic reservoir control has always been a hot topic in the field of oil and gas geology.At present,there is still a lack of detailed and in-depth research on the structural reservoir control of Fuyu Oil Layer in western Anda area in China.The main purpose of this paper is to determine the structural characteristics and evolution law of Fuyu Oil Layer in western Anda area,as well as its controlling effect on hydrocarbon accumulation.Through the detailed research on the structural characteristics and reservoir control mechanism of Fuyu Oil Layer in western Anda area,it will play a certain reference role for the future development or research of this area and has important theoretical and practical significance.By making full use of the data of drilling,logging and seismic western Anda area and using the method of combining well and earthquake,the Fuyu Oil Layer is divided into 5reservoir groups by single well division and correlation,among which the F? reservoir is divided into 3 reservoir groups and the F? section reservoir is divided into 2 reservoir groups.Through the stratigraphic division and correlation of the skeleton section of the connecting well and the formation isothickness map made according to the well location information,it is found that the formation thickness distribution of F? oil group is relatively stable,the overall thickness is thick,showing the characteristics of thin in the south and thick in the north,and the edge part is generally thin.The F? oil formation is relatively thin,thicker in the middle and east of the study area,and thinner in the north and south.There are two types of oil and gas reservoirs in Fuyu Oil Layer in western Anda area,which are structural and lithology-fault reservoirs.The distribution of oil and gas is not uniform on the plane,and the oil content of the whole area is general.The oil wells are mainly distributed in the south of western Anda area,and the natural gas content is very small.The distribution of oil and gas resources in each reservoir is also different.The oil and gas distribution range is the most extensive in F?1 small layer,and the oil and gas range gradually shrinks with the deepening of layers.The test results of F?1 and F?2 reservoirs are the best in the vertical direction,and the characteristics of gradual deterioration are observed downward.Based on the 3D seismic data,the structure of western Anda area is carefully studied.It is found that the faults in this area are densely developed and show the characteristics of zonal development.According to the fault perforation horizons and fault activity,the faults can be divided into four kinds of fault active systems.When oil is supplied perpendicular to the fault dense zone,the transfer position between the fault dense zones will control the dominant oil migration path.The blocks between the fault dense zones and the transfer sites of dense zones are the favorable sites for oil accumulation.The micro-structure in western Anda area can be divided into positive micro-structure and negative micro-structure,among which the probability of accumulation of positive micro-structure is better than that of negative micro-structure,and the micro-fault nose structure in positive micro-structure plays an important role in controlling the distribution of oil and water.Traps in western Anda area can be divided into five types.Oil reservoirs mainly exist in complex traps with multiple faults and lithology-fault traps,while no oil Wells have been found in single fault blocking traps and faulted anticlines traps.