Study On Sedimentary Facies Of Fuyu Reservoir In Anda Area Of Songliao Basin

Using seismic,logging,mud logging,core,seismic,geological well data applications such as method of combining the objective layer of Fuyu reservoir in the study area can be divided into F?and F? two reservoir group.Through the data analysis of exploration Wells,43 st Andard Wells were selected for comparison,and through the combination of well seismic calibration of single well and correlation of well skeleton profile,the longitudinal 5 layers of Fuyu reservoir in the study area and the closure of the whole area were achieved.Meandering river facies-delta facies sedimentary system developed in Fuyu reservoir of Anda area.Nine kinds of sedimentary microfacies are identified,meandering river facies contains meandering channel,crevasse splay of meandering river and alluvial plain between three types of microfacies,delta plain subfacies include distributary channel,crevasse splay and distributary bay between three types of microfacies,delta front includes underwater distributary channel,underwater crevasse splay and distributary bay between three types of microfacies.By single well facies,even well facies analysis,it is concluded that the study area from F?2 reservoir to F?1 reservoir sedimentary period,first by delta front to make the transition to delta plain,the sedimentary water body becomes shallow gradually,in the late F?1reservoir sedimentary water body to the most shallow,in F?3 turn reservoir sedimentation period,water from shallow darker in F?1 reservoir sedimentary period formed a set of delta front deposition,which consists of delta front subfacies to delta meandering river facies to delta plain subfacies and delta front subfacies of sedimentary evolution process.The distribution characteristics of the sedimentary microfacies in the area without well or the area beyond the control of well location were predicted according to the optimal maximum amplitude property,and the plane distribution,morphology and development scale of the sedimentary microfacies in the area without well were described in detail.Through the analysis of single well phase,well connection phase and plane phase,the distribution law of reservoir sand body plane is obtained.The development of sand body in the study area is controlled by the source material in the north,and the development degree of reservoir is obviously controlled by the sedimentary facies zone.There are many layers of sandstone with a relatively thin single layer,and the sand body is banded with poor continuity.Analysis of the sedimentary facies in the study area,known: F?2 period,the delta plain subfacies were mainly developed,eastern delta front subfacies with small range developed,it reflect sedimentary deep water;F?1 period,subject to delta plain subfacies deposition,meandering river facies developed in eastern edge areas,reflect the sedimentary water body becomes shallow;F?3 period,the main body is the delta plain subfacies,meandering river facies is only developed in the eastern edge of the study area,reflect sedimentary water body began to deepen;F?2 period,the sedimentary water,continue to deepen,the eastern edge of meandering river deposition,most of the delta plain subfacies deposition,in the southwest corner of the delta front deposition;F?1 period,the sedimentary water body to the deepest,delta front subfacies deposition of regional development.