可变的低矿化度地层水剖面的解释方法

论述了在淡水地层条件下，应用盐水泥浆钻井，自然电位曲线能很好地反映地层水的矿化度变化。并导出了应用自然电位差与视地层水电阻率交会法确定不同层系的变化的地层水电阻率，进而计算含油气饱和度的方法。实例表明应用该方法对可变的低矿化度地层进行解释，得到了高分辨率的饱和度曲线，使油水层区分界线明显，解释效果好。

Profile Interpretation of Formation Water with Variable Low Salinity

Spontaneous potential(SP) curves can reflect variations of formation water salinity in the process of salt mud drilling under fresh formation water conditions Formation water resistivities of different strata can be determined by applying the intersection of SP difference with apparent formation water resistivity and oil and gas saturation is consequently calculated A case interpretation shows that a high resolution saturation curve is obtained for formation with variable low salinity water, thus the division of oil layer from water layer is distinguished obviously