对油层水电阻率的思考

在地层水矿化度较低的地层剖面内计算油气层含油气饱和度时，经常遇到解释结果偏低的总是以致地不能用于油水识别、储量计算，甚至发生漏掉油气层的严重问题。本文提出，在利用含水饱和度方程计算油气层的含油气饱和度时，参数ＲＷ应使用油气层不电阻率。在多数情况下，油气层水电阻率不同于水层水电阻率。地于地层水矿化度较低的陆相沉积地层而言，这个问题特别重要，文中列举了两个例子加以说明。

Notes on Water Resistivity of Oil Zone

While calculating hydrocarbon saturation for formation with low water salinity, the interpreted saturation is always too low to identify oil /water bearing zone,affecting the reserves calculation. Oil /gas bearing zones are even often left out. It is proposed that while calculating hydrocarbon saturation of oil and gas bearing zone with water saturation equation, irreducible water resistivity should be used for the parameter- Rw. In most cases, formation water resistivity of hydrocarbon zone is different from that of water zone. This is especially important for continental deposit with low formation water salinity. Two examples are given to explain the above-mentioned view point.