Fine Anatomy And Remaining Oil Research Of The River-delta Reservoirs In North-three-West Northern Area

Daqing oil field in northern Songliao basin of large rivers-delta continental sedimentary,contains a rich oil reservoir, With50years of development and mining, has entered the highwater content, high water cut stage of development. With the rise of the aquifer, tertiary oilrecovery in-depth, continuously improve the distribution of remaining oil is increasinglycomplex and well network is constantly encrypted accuracy of reservoir understanding, depth,type levels of rivers-delta reservoir fine. According to the geological origin and the storagecapacity of each reservoir, the reservoir is divided into Class Ⅰ reservoir fluvial class IIreservoir delta distributary plain subfacies, Class III reservoir within the delta front sub andtriangular intercontinental front subfacies. Class I reservoir river development of large-scale,flat and vertical cut stack of serious, complex configuration of sand within the reservoir ofClass Ⅱ and class Ⅰ reservoir microfacies of various types, phase transition complex, witha sand volume change in the course of the study thinner, low permeability, the river becomesmaller, more heterogeneous characteristics, class III reservoir causes need to further clarifythese complex sedimentary characteristics determines the complexity and difficulty of thedevelopment of adjustment, to adjustment programs and the production performance of thevarious types of reservoir development a great deal of difficulty, therefore, divided into threetypes of reservoirs on the basis of sand body geometry, scale and distribution of exhaust river,the identification of a single sand body the geological features of the internal structure,permeability, horizontal distribution and vertical variation of heterogeneity in CommunistChina, North west North block rivers-the delta system, to identify nine different causes ofdeposition mode of the channel sand body. And flooding data to come to the flooding levelmaps, and by the maps that the distribution of remaining oil. Analysis of the deposition modeand remaining oil distribution relationship.