注水剖面资料确定吸水层动态残余油饱和度

通过岩心长期注水试验资料分析认为，随着注水时间的延长和注水量的增加，其注水井中各吸水层的岩性和物性发生了变化，吸水层的残余油饱和度并不是一个定值，而是缓慢减小。由此，提出了利用注水副面测井资料来确定这种动态变化的残余油饱和度的方法。收集了12口井的油、水相对渗透率的试验数据，做有关的交会图分析发现，孔隙度、渗透率越大，其残余油饱和度越小，同时还与粒度中值和泥质含量有关；根据传统观念上的残余油饱和度以及根据历次的注水剖面资料确定注水层各层的注水量和有效厚度，在此基础上确定注水层当前的动态残余油饱和度值。例举了应用实例。但含油水层或水层投注后不能用上述方法确定动态残余油饱和度。

Using Water Injection Profile Data to Determine Dynamic Residual Oil Saturation of Water Accepting Layers

The experimental data of cores which are injected by water for a long time proved that the residual oil saturation of absorbing intervals decreases slowly with the injection time prolonging and injection rate increasing. According to the injection profile data, a method is proposed for determining the dynamic residual oil saturation. Crossplots of both residual oil saturation versus porosity and residual oil saturation versus permeability showed that the higher the porosity and permeability, the lower the residual oil saturation. In addition, the residual oil saturation is also related to grain sizes and shale content. Traditional residual oil saturations and water injection profile data are used to determine water injection rates and effective thickness of each injecting layer, based on which the current dynamic residual oil saturation of the injecting layers are obtained. But, the above method can not be used in water/oil bearing beds or water layer which have been injected.