A Study On The Origin Types And Remaining Oil Distribution Models In The Lfuvial Fades Reservoirs Of Sazhong Oilifelds

Fluvial facies is the most important oil and gas reservoirs in continental group, it is alsoone of the most important characteristic facies belt in continental petroliferous basin of ourcountry. The geological reserves of Saertu reservoir and Putaohua reservoir in the pure oilzone of Sazhong development oilfield, river channel sand geological reserves accounts formore than60%. Coring data confirm, most of remaining oil distributes in channel sand bodyof fluvial reservoir. However, the fluvial reservoir with serious heterogeneity, it is always theprimary factors that affect the effectiveness of oil field development. In view of the riversedimentary reservoir development in Daqing Sazhong oil field is representative of theactual situation, a study is carried on different types of fluvial reservoir 's internal texture,structure, lateral and vertical facies change law and the reservoir fluid seepage control andeffect, we carry through the study of the remaining oil genetic type and distribution patternof a fluvial sandbody reservoir, analyse the typical fluvial sand body sedimentary model, thefluvial reservoir plane and vertical heterogeneity in detail depict, discuss deeply the sandbody geometry, size, connectivity, rhythmicity features, reservoir permeability variation,internal interlayer growth features, research in fluvial reservoir layer of single sand bodyformation environment and recognition method,divide the remaining oil of fluvial faciesreservoir in high water cut period into11genetic types, the classification method is moreprecise than previous people, and put forward the methods for tapping the potentialrespectively,at the same time divide the microcosmic remaining oil into8modes, analyzethe potentiality of remaining oil with sealed coring core data. This paper can better revealthe fluvial reservoir sedimentary model of residual oil distribution form, control effect,provides an effective way for EOR of the main reservoir in high water cut period, and it alsocan provide the basis for the special high water cut sandstone oilfield adjustment potential.