Sedimentary Model of the Putaohua Reservior in the Yushulin Oilfield in the Songliao Basin

Key words: 
• riv er一dominated delta /
• sedimentary microfacies /
• depositional model

Abstract: as a river dominated delta deposit. It develops three kinds of subfacies delta above一water plain,deltain-ner front and delta outer front. On the basis of this,it can be subdivided into eight kinds of microfaciessurficial distributary channel, interchannel area, interchannel swamp, subaqueous distributary channel,debouch bar，inter distributary bay，sheet sand and delta front mud. The plane distribution feature of sedimentary fades is that from northwest to southeast, delta plain,delta inner front, delta outer front appear in order. Different microfacies overlie and interlace with eachother.Distributary channel sandbody and debouch bar sandbody the main sandbody framework of delta. Combining research results of crofacies analysis on a single well with plane distribution featuresof sedimentary microfacies, the sedimentary model of the Putaohua reservior in the Yushulin oilfield isbuilt finally. It objectively shows sedimentary featuers of the Putaohuaerervior and provides acertaingeological evidence for further oilfiekl development.