扶余油田水淹层岩石物理相电阻率下降解释方法

Well logging Comprehensive interpretation and evaluation of waterflooded layer in fuyu oil field

分析了不同沉积韵律储层的水淹地质特征,认为不同沉积韵律储层的岩性、物性控制了储层的剩余油分布.以密闭取心井资料为基础,以油藏条件下水驱过程储层水淹导电机理为指导,引入岩石物理相分析技术,应用电阻率下降法建立了水淹层测井解释标准,通过含水率计算定量判断水淹级别.此评价方法适用于高含水后期的砂泥岩储层的水淹层评价.

The geologic characters of the water-flooded reservoirs of different sedimentary rhythms are analyzed,and it is held that the lithology and physical property of the reservoirs of different sedimentary rhythms control remaining oil distribution.Based on sealing coring data,the reservoirs in Fuyu Oilfield are divided into 4 types according to their petro-physical facies.The criterion for the logging interpretation of water-flooded reservoirs is established using electrical resistance descent method,and the water-flooded grades of the reservoirs can quantitatively be determined by computing their water cut.This method is suitable to the evaluation of the water-flooded sand mud reservoirs in the later stage of high water-cut.