前言某些产油层具有如此低的电阻率(一般小于1欧姆—米),以致用标准测井解释方法把它们与产水层区别开来是困难的,甚至是不可能的。困难性的理由是,这些解释方法通常导致计算出高的地层水饱和度(50%或更大)。计算的精确性是可疑的,或者它与未知的地层束缚水饱和度有关。经验指出,这些地层的高电导率(低电阻率)是由于孔隙空间含高的矿化度或低电阻率的盐水、地层高孔隙度、高泥质(或粘土)含量以及高 Foreword Some pay zones have such low resistivities (typically less than 1 ohm-meter) that it is difficult, if not impossible, to distinguish them from aquifers by standard log interpretation. The reason for the difficulty is that these interpretation methods often result in the calculation of high formation water saturations (50% or more). The accuracy of the calculation is questionable, or it is related to unknown strata irreducible water saturation. Experience has shown that the high conductivity (low resistivity) of these formations is due to the high salinity or low resistivity brine, high porosity, high argillaceous (or clay) content and high