The Study On Remaining Oil Distribution Of B₁Layer In Baikouquan Oilfeild

Baikouquan oil reservoir in Xinjiang is a low porosity and low permeabilityoilfield, which is an alluvial fan. After30years of development since it was launchedin1979, the reservoir has to face a plenty of problems, such as growing seriousness ofinterlayer interference, a poor relationship of injection production corresponding, alow percent of producing reserves and a vague understanding of the remaining oildistribution.Based on the results of previous studies and the analysis of available data, thispaper further analyzes the geological features of oil fields, computes the geologicalreserves in B₁layer, standardizes the recovery ratio. At the same time, using themethod of combining theoretical analysis with the actual production, this paperstudies the water cut changing regulation, evaluates the effects of oilfielddevelopment, and takes an analytical study of problems during the developmentprocess.To study the distribution feature of the remaining oil, with the help of PetrelSoftware, this paper uses the method of facies-controlled modeling to establish areservoir geological model. Using numerical simulation and reservoir engineeringmethods to research the oil-reserves producing status, the study shows that thedistributions of remaining oil in the reservoir have obvious differences in horizontaland vertical direction. In the plane, the remaining oil mainly distribute in the westernregion near the fault. Mostly, they have a zonal distribution, and others presentisland-like enrichment. In the vertical direction, the B¹¹layer and B₁²layer show agood reserves producing, while that in B₁³layer is poor. The statistics ofliquid production profile find that the water cut of some layers, which are lowliquid intensity, is medium-low, and the oil reserve is relatively rich in these areas.Combined with the remaining oil distribution characteristics, this paper analyzesa variety of factors which affect the producing reserves. Studies have shown these factors, such as the reservoir quality, the reservoir heterogeneity, sedimentarymicro-facies, the sedimentary rhythm, the interlayer, the injection patterns perfection,the absorbing capacity of water wells, the condition of oil product wells, have a greatimpact on the remaining oil distribution.