Fine Description Of Sand Body And Residual Oil Analysis Of Puyi Reservoir In West Of Middle Daqing Oil Field

This paper divides Puyi reservoir into sedimentary units，and also set up stratigraphicframework, in the application of high resolution sequence stratigraphy and sedimentology,reservoir stratigraphic classification and correlation, providing a reliable geological conditionsto the plane sedimentary microfacies study.Under the guidance of stratigraphic framework, this paper set up the the channel sand bodyand non channel sand dody division standards,and then divides the channel sand body intofour types: the heart beach,first class,second class and third class channel sand, and alsodivides the non channel sand body into nine types: first class,second class,third class andfouth class overbank sand, first class,second class and third class sheet sand,and pinch.On thebasis of these standards, this study establishes20facies models(3types of sedimentary facies,20types of microfacies): braided river, meandering river, delta front distributary plain,andthen draw the sedimentary facies planes, and then finely describes them. On the basis of theabove work, this paper put forward a new understanding of single sand body of river,in thecondition of high dense well network. Fistly, this paper identified the typical abandonedchannel sand body in the meandering river channel. Secondly, finely divided flake distributaryplain and delta front sandy body into single sand body.Thidly, this paper reidentified parts oflump discontinuous sand body into a continuous band or dendritic underwater distributarychannel sand body.Combined with the previous view, this paper put forward the main control factors ofremaining oil of Puyi reservoir under the condition of the high water cut stage of high densenet work: sedimentary facies, the difference of permeability, thin sand sedimentary rhythm,the single sand body contact, the degree of perfection of injection production system,distribution of well network and dynamic production. This study summarize several types ofthe remaining oil: the channel edge water not affected remaining oil, large banded waterinjection and not complete channel sand remaining oil, The narrow banded channel sandblocking remaining oil, the abandoned channel blocking remaining oil,and large complexsand body channel side shielding remaining oil...