利用图像处理技术计算岩心剖面的水驱波及系数

Estimating the waterflood sweep efficiency of core profile by image processing technology

基于数字图像处理技术,对现场采集密闭岩心的剖面图像进行处理,可定量提取出岩心面上水淹波及区域面积的信息;利用这一直接反映地下真实油层水驱波及状况的图像资料,可较准确地估算出剖面或平面水驱波及系数。由于岩心面上水驱波及目标区域背景复杂,影响因素较多,采用了相似准则的二值化算法,充分考虑二值化分割前后图像整体一致性,可得到较准确的岩心面图像上水淹区域面积估计值,获得了较好的应用效果。为较准确估算注水开发油田水驱波及系数开辟了一条新的思路。

Based on the digital image processing technique, the profile map of sealing core acquired in the field has been processed, which can quantitatively get the informations of watered sweep area on the core surface. By using the image data that directly reflected real waterflood swept situation of underground oil layers, the waterflood sweep efficiency in profile or in plane can be exactly estimated. The background of waterflood swept object area on the core surface is complex and there are many influencing factors. The application of binarization algorithm of similarity criterion in which images of binarization and unbina-rization show the best consistency can get the accurately estimating value of waterflooded sweep area on the image of the core surface. The good effect has been obtained in the oilfield and a new thought for estimating exactly water drive sweep efficiency in the waterflood development oilfield is set up.