用油水相对渗透率确定低电阻油层产液性质

Estimate produced fluid type of low resistivity hydrocarbon-bearing reservoirs from relative permeability

进行高温高压条件下的岩电实验,建立含水饱和度模型以及用孔隙度和泥质含量求取束缚水饱和度的模型;对岩样油水相对渗透率实测结果进行多元非线性回归,建立油水相对渗透率计算公式;用油水相对渗透率确定低电阻油气层的产液性质。H油田油层电阻率低的主要原因是束缚水含量高、地层水矿化度高,计算这类低电阻油层含水饱和度时应使用高温高压岩电实验结果,用油水相对渗透率能较好地识别低电阻油层、划分油水界面。

For low resistively hydrocarbon-bearing reservoirs of high content of irreducible water, though the hydrocarbon saturation is very low, it can also produce pure gas. On the base of a case study about H oilfield, the method for calculating oil-water relative permeability, the water saturation and irreducible saturation is used to calculate it, and the technique to estimate production fluid character of low resistively petroleum deposit, to identify low resistively hydrocarbon-bearing reservoirs from relative permeability is discussed. It is concluded that the Archie' exponents measured at high temperature and high pressure should be used when calculating water saturation of low resistively petroleum deposit.