Study On Sedimentary Microfacies And Oil-Water Distribution Of Putaohua Oil Layer In Block Gu603 Of Xinzhao Oilfield

Xinzhao Oilfield is located in the Xinzhao nose structure in the south of the Qijia-Gulong Sag in the central depression of the Songliao Basin.It is adjacent to the Daqing Changyuan Putaohua Oilfield in the east,connected to the Xinzhan Oilfield in the south,and facing the Puxi Oilfield in the north and The ancient dragon is slanting.Xinzhao Oilfield is most obviously affected by the northern sedimentary system and the Yingtai sedimentary system,mainly distributed in a continuous sheet or strip.The reservoir is affected by faults,structure,lithology,physical properties and fractures,which makes the oil-water distribution relationship complicated.Therefore,the study of oil-water distribution laws is conducted.This paper comprehensively utilizes the data of core,logging,logging and oil testing in the study area,taking sedimentary petrology,petroleum geology and tectonic petrology as the theoretical basis.By dividing and comparing the strata in the study area,it is determined that the Putaohua oil layer is divided into 11 small layers and 15 sedimentary units in the upper,middle and lower sandstone groups;four logging facies models have been established to determine the underwater distributary channels,There are four types of microfacies in the main mat sand,non-main mat sand and underwater distributary bay and the characteristics of the sand body distribution in each sedimentary unit.Further analysis of reservoir formation conditions and determination of three main types of reservoirs: fault block reservoirs,fault-lithologic composite reservoirs and lithologic reservoirs;through the statistics of oil-water vertical types in a single well,the entire section of pure reservoirs,There are 5vertical distribution types in the upper and lower oil layers,the upper oil layer and the lower water layer,the interlayer between the oil layer and the oil layer,and the differential oil layer in the whole section.By drawing the distribution maps of the oil and water layers in each small layer and analyzing the development characteristics of the oil and water layers,it is concluded that the oil layers and poor oil layers are mostly developed in sheets and strips,and the same layer,water layer and dry layer are mostly dotted in the oil layer.The law of distribution in the poor oil layer or the plane distribution alone.The study area was divided into 6 well areas due to the division of faults,and then the oil and water distribution characteristics of the whole area were mainly controlled by fault-lithology joint control.The distribution characteristics of sand bodies controlled by sedimentary microfacies.The oil layer is developed in the channel sand body and mat-shaped sand,and the poor oil layer isdeveloped in the non-main body mat-shaped sand,The oil-water stratosphere develops in the underwater distributary channel and the main sheet sand,while the water layer and the dry layer are mainly distributed in the non-main mat sand.