Sedimentary Microfacies Of Fuyu Reservoir In Block M In The South Of Songliao Basin And Its Control On Oil And Water Distribution

With the development of Fuyu reservoir in block m in the south of Songliao Basin,we have a further understanding of the reservoir in the study area.The reservoir in block m changes rapidly laterally and the distribution of oil and water is complex.The original understanding of the study area has been difficult to meet the development needs at this stage.Therefore,it is necessary to combine logging,core,seismic and dynamic data to study sedimentary microfacies and depict the distribution of underground reservoirs to improve the recognition accuracy of oil reservoirs,so as to realize the economic and effective development of this area.In this paper,based on the theory of sedimentology,structural geology and petroleum geology,combined with logging,geology and seismic data,the stratigraphic division and correlation of Fuyu oil layer in the study area are carried out again,and the vertical small layer is subdivided,the original 12 small layers are subdivided into 16 small layers,and the isochronous stratigraphic framework is established by well seismic combination.At the same time,under the regional sedimentary background,making full use of geological,logging,core and other data,the logging facies model of two subfacies and seventeen sedimentary microfacies of delta plain and delta front in the study area is established.The seismic attributes are extracted from the three-dimensional seismic bodies in the study area,and optimized by combining with the basic maps such as sandstone thickness.The reservoir prediction is carried out by using the seismic attribute technology.Guided by the seismic trend,the well point microfacies are controlled,the reservoirs of different scales are treated differently,and the sedimentary microfacies are precisely depicted,so as to realize the accurate description of the sand bodies between wells,define the distribution characteristics of sandstones and depict them The distribution law of the plane sedimentary facies belt of each sand formation.Finally,the reservoir forming conditions and oil-gas distribution rules of block m in the south of Songliao basin are analyzed.It is confirmed that the study area has good reservoir forming conditions,there is no unified oil-water interface in the whole area,and the sedimentary microfacies type affects the oil-gas distribution.According to the paleotectonic background,sedimentary microfacies type,sand body distribution characteristics,oil testing and logging data of the study area,the oil-water boundary of the study area is analyzed.According to the sand body distribution map of each sedimentary unit,two types of favorable areas are predicted in the study area,and three vertical wells and one horizontal well are arranged in the favorable area according to the actual situation,providing economic and effective development for the development and deployment of block M.