拟毛细管压力曲线在水淹层评价中的应用

To Evaluate Water-flooded Zone with Reconstructed Capillary Pressure Curve

转换后的岩心压汞毛细管压力曲线反映了油藏条件下油柱高度与地层原始含烃饱和度之间的关系,通过毛细管压力曲线可以得到原始地层含油饱和度。引入拟毛细管压力曲线重构技术,实现了无取心井段毛细管压力曲线的求取,结合水淹后测井资料计算的剩余油饱和度,进行水淹层水淹级别评价。通过渤海中—高孔渗密闭取心井和调整井中的应用,证实该方法处理过程简单、方便,处理结果与岩心分析结果吻合较好。该方法评价地层原始含油饱和度未使用电阻率,因此对于低电阻率油层原始含油饱和度评价也有较好的效果。

The capillary pressure curve from injected mercury of core represents the relationship between oil height and oil saturation in reservoirs, so we can obtain initial oil saturation of the formation from this curve. Technology of reconstruced capillary pressure curve is proposed to calculate capillary pressure curve in any wells without cores. Combining with post-flooded log data, we calculate the ramaining oil saturation and divide the reservoir flooded levels. The application results of Bohai cores well with middle and high porosity and permeability and adjustment well show that this method is simple and convenient, the processing result has better consistence with core analysis result. The evaluation not use resistivity, so, its evaluation effect is better reservoir.