注水开发油田水淹层常规测井解释方法——以克拉玛依油田为例

CONVENTIONAL LOG INTERPRETATION OF WATER OUT ZONE IN WATERFLOODING OILFIELD—An example of Karamay oilfield.

常规电法测井在我国的水淹层测井系列中占有相当重要的位置。对一般的注水开发油田，常因油层被注入的淡水、污水混相水淹后，而无法准确给出各水淹层的地层水电阻率，使水淹层测井解释产生较大的误差。围绕地层水电阻率这一关键参数，利用数理统计、动态测算、地质建模等手段，结合油田开发全过程的生产资料，提出了一组模数为地层孔隙度、有效粘土含量的地层电阻率与含水饱和度的关系曲线图版。用克拉玛依油田三个层块四口密闭取心井的岩心资料对该方法的解释参数进行验证，认为对常规测井水淹层解释水平有了较大的提高。

When an oil reservoir is watered out by freshwater and sewage miscible phase in a waterflooding oilfield, formation water resistivity of each water out zone can't be accurately determined, which resulted in bigger error in log interpretation of water out zone. An interpretation chart of water saturation (the relationship curve of formula resistivity and water saturation) was presented by applying mathematical statistics, performance testing and establishment of geologic model etc., combined with all production data from development of an oilfield. Verification of the chart was made by using core data from four sealed coring wells in three blocks of Karamay oilfield. It is concluded that the conventional log interpretation of water out zone can be improved greatly by this method.