Distribution Rule About Remaining Oil In The Songfangtun Northern Oil Fields Putaohua Reservoir

SongFang tun putaohua reservoir of oil is equivalent to Pu I1-3oil reservoir in the Oilfields of daqing placanticline, is a series of the celadon, variegated mudstone, transition rockand powder-fine sandstone combination in long black mudstone.The continuity of Sand bodydevelopment is poor, spread is uneven,the scale and form of sand body development isdifferent in the different sedimentary unit,and sandstone thickness is quite different in everysedimentary unit.Sand body expanded to many direction in the zhusan experimentalsite,spread is uneven,drill encounter rate is different in the different sedimentary unit.and theaggregate thickness of sandstone is quite different.because of the different well network in thetwo experimental sites,the potential of remaining oil have difference,the potential ofremaining oil is large in the Songfang tun experimental site relatively,however recoverablereserve is less.combining dynamic and static data analysis with numerical simulationresearch,we thought the distribution types of remaining oil include not perfectinjection-production type,well nets couldn’t controling type,plane interference type,one-wayby water injection effect type,not perforating type and bibulous sent type in the experimentalsites.because of the fault development in the zhusan experimental site,there is fault block typeas well.the remaining oil is the largest proportion in the distributary channel sand,followed bysheet sand,non-main sandstone is only in a small pat.The remaining oil in the plane is dividedinto three kinds:a reservoir remaining oil wells points more than40%of total wells,it iscalled a large area of distribution type.the remaining oil wells points to the region accountedfor well points percentage between20%to40%,it’s called local distribution pattern.theremaining oil wells region points percentage points is less than20%.it’s named by scatteredtype.The distribution of the remaining oil in the longitudinal direction is divided into threekinds:static method analyze that the remaining oil is mostly concentrated in the point ofuninjection wells.the numerical simulation results show that there are still remaining oil in thehigh moisture content and the reservior with high recovery degree.the checking wells’datashows that there is still remaining oil in the upper part of the channel sand body.