Depositional Microfacies Study Of Fuyu Oil Layer In Changde-taidong Area

The east of Daqing placanticline is an important resource field of Daqing oilfield,and Fuyu reservoir in Changde-Taidong area is a low porosity and low permeability reservoir.The distribution of oil and gas is complex,the exploration and development cost is high.The study on sedimentary facies and favorable target area of Fuyu reservoir can effectively analyze the distribution of oil and gas and provide accurate geological basis for future exploration and development,thus reducing exploration difficulty and development cost.This study used modern sedimentology,combined with reservoir geology,sequence stratigraphy,petroleum geology and logging geology to make in-depth research on sedimentary microfacies in Changde-Taidong Area.The study area is divided into sedimentary units,and Fuyu oil layer is divided into 5 fourth-order sequences and 12 fifth-order sequences by selected the reasonable layering standard well,reference curve,horizon,boundary and separability data.The main sedimentary facies of Changde-Taidong area are derived from the sedimentary background of the region,the petrological characteristics of the coring well and the analysis of the single well profile,and the most developed facies are found in the shallow water delta.Based on the research of single well and continuous well facies,the distribution rule of plane phase of subdivision layer is summarized.Through the study of sedimentary microfacies of subdivision layer under the control of high frequency sequence framework,the temporal and spatial evolution characteristics of sedimentary microfacies of subdivision layer in Fuyu oil layer in the study area are analyzed,and the sedimentary facies model of subdivision layer in Fuyu oil layer in Changde-Taidong area is established.The above research contents can provide effective support for the next work,and play an important role in the study of subdivision layer in Sanzhao area.