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我国各含油气盆地勘探实践表明,低电阻率油气藏储量丰富、产能高,是油田增储上产的重要领域,也是老井挖潜的主要目标。由于低电阻率油层成因复杂多样,给用测井资料对其进行评价带来很大困难,因此必须采用适于低电阻率油层的测井评价技术。通常,低电阻率油层是由高束缚水含量引起的。依据多相流体在多孔介质中的渗流理论,根据油水相对渗透率实验结果,采用多元非线性回归的方法建立油水相对渗透率模型,在准确确定含水饱和度、束缚水饱和度的基础上,可用油水相对渗透率评价此类油气藏。实例证明,该方法不仅简单易行,而且可大幅度地提高解释成功率。
Exploration practice in all oil and gas basin in China shows that low resistivity oil and gas reservoirs are abundant in reserves and high in production capacity, which is an important field for oil and gas production increase and production, and also the main target for tapping potential of old wells. Due to the complex and diverse formation of low-resistivity reservoirs, it is very difficult to evaluate them with well logging data. Therefore, logging evaluation techniques suitable for low resistivity reservoirs have to be used. In general, low resistivity reservoirs are caused by high bound water content. According to the seepage theory of multiphase fluid in porous media, the relative permeability model of oil and water was established by multivariate nonlinear regression based on the experimental results of relative permeability of oil and water. On the basis of accurate determination of water saturation and irreducible water saturation, The relative permeability of oil and water evaluates such reservoirs. The example proves that the method is not only simple and easy, but also can greatly improve the success rate of interpretation.