Sedimentary facies of sand groups in Heidimiao Reservoir from Block Aoqian1-Mao702 in Toutai Oilfield

Through analysis on coring data,logging data,palaeophyte,elements,rock chips and grain size,this paper determines sedimentary facies,subfacies and microfacies and their characteristics of studies intervals in this area,and establishes corresponding identification signs.Sedimentary facies in Heidimiao Reservoir develops meandering deltic and lacustrine facies.It uses sequence stratigraphic and geophysical methods to predict areal distribution of sandbodies,and analyzes areal evolution rules.From early period of Member 3 to Member 4 in Nenjiang Formation,sedimentary facies of Block Aoqian1-Mao 702 appears as extending in EW direction and changes apparently in NS direction, forming generally coarsening upward propagational sequence,and reflecting sedimentary characteristics of lake level shrinking.