化学驱后水淹层地质特征及测井响应分析

大庆长垣喇萨杏油田经多年开发,已进入水驱、聚驱、三元复合驱并存阶段。注入溶液改变了储层的物理性质,地层水矿化度、含油饱和度、孔隙结构以及岩石润湿性等都会发生变化,不同的驱替方式导致了不同的储层地质特征。油层水淹后,电阻率、自然电位、微电极幅度差等测井响应的变化规律也不同。本文利用大庆油田丰富的密闭取芯检查井资料,系统的研究了化学驱后水淹层地质特征及测井响应特征分析,对提高水淹层测井解释的精度奠定了基础。

Analysis of geological characteristics and logging response of water-flooded layer after chemical displacement

After many years of development,LaSaxing oilfield in Daqing changyuan has entered the stage of coexistence of water flooding,polymer flooding and ASP flooding.The injected solution changes the physical properties of the reservoir,such as formation water salinity,oil saturation,pore structure and rock wettability.Different displacement methods lead to different reservoir geological characteristics.The logging responses of resistivity,spontaneous potential and micro-electrode amplitude difference are different after reservoir water flooding.In this paper,the geological characteristics and logging response characteristics of watered-out layer after chemical flooding are systematically studied by using the abundant data of closed coring inspection Wells in Daqing Oilfield,which lays a foundation for improving the logging interpretation accuracy of watered-out layer.