ANALYSIS OF SEDIMENTARY FACIES AND TARGET PREDICTION FOR SHAERTU SANDBODY GROUP IN TAIKANG-XICHAO AREA,NORTH OF SONGLIAO BASIN

Daqing Oilfield is in a high extent of exploration and development,on the basis of core data and well log data,we analyzed three types of sedimentary facies including braid delta facies,delta facies and lacustrine facies;five types of subfacies including braid delta plain,braid delta front,delta plain,delta front and sublacustrine,and twelve types of microfacies including braided distributary channel,fluvial plain,braided underwater distributary channel,distributary channel,underwater distributary channel,interdistributary bay,river mouth bar,distal bar,sand of front marginal,sand bar,beach bar,loch sheet sand,and mud flat in the study area.According to the divisions of sedimentary facies,subfacies,and microfacies for each well,the distribution characteristics of sedimentary microfacies of each sandbody group in Shaertu reservoir in Taikang-Xichao area was showed,which has a significant sense for further exploration of lithologic reserviors.Combined with the hydrocarbon geological character and prediction of sedimentary facies,it is indicated that there are two oil and gas beneficial areas,one is the slope zone of Jiang21-Du65-Lai20 well,the other is Du53 well block.