Abstract: According to the theory of secondary oil migration and on the basis of the calculated minimum throat radii of the water wet (or slightly water wet) reservoirs of the study area, an oil-bearing coefficient N is proposed for the determination of the volume of oil in the pool. N is a dimensionless coefficient, equivalent to the ratio between the measured or calculated height of oil column and the height of oil column calculated by displacement pressure. The higher the value of N, the better is the reservoir, and vice versa; and a pool occurs only when N is greater than 1.From the capillary curves, the original oil saturation is calculated, which averages 67% for reservoirs in the middle section of Maling oil field as against 60% measured from cores.

摘要： 本文根据石油二次运移原理,在计算本区亲水-弱亲水油藏含油最小喉道半径的基础上,提出了确定油藏含油程度的系数(N)。N值是一个无因次量系数,等于用实测的油藏油柱高度或计算的油藏油柱高度(H)和用排替压力计算的油柱高度(H_D)之比值。N值愈大油藏含油愈好;N值愈小油藏含油愈差;N值等于1时,不可能成为油藏。用最小含油喉道半径所对应的有关压力在毛管压力曲线上求出油藏的原始含油饱和度。计算出马岭中区各油藏的原始含油饱和度平均为67%,而油基泥浆取心实测的原始含油饱和度平均为60%。