Sedimentary microfacies and sand body distributing character in Qingshankou Formation of Suotu area in Changling sag

By analyzing the drill core,well logging and seismic profile in Suotu area of Changling sag,Qingshankou Formation sedimentary microfacies and characteristics of sand body distribution in this area are studied.The result indicated that the Gaotaizi oil layer in Suotu oil field was mainly the delta deposit;the Qingshankou reservoir can be divided into the delta plain subfacies deposition and the delta front subfacies deposition,which developed in distributary channel microfacies,interdistributary thin layer granulated microfacies,underwater distributary channel microfacies and underwater interdistributary thin layer granulated microfacies.In objective layers,GI1 and GIV2 layers are poorly developed sandstone,but GI2 and GIV1 layers are well developed sandstone in a larger-area lamellar distribution pattern.