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低电阻率油气层的测井响应特征不明显，其电阻率数值很低，有时比围岩的电阻率还低。油层被误解释或漏掉的情况时有发生。分析了曲堤油田沙三、沙四段低电阻率油气层的岩性、物性、含油性及电性特征，认为低电阻率的成因是：束缚水含量高；伊利石粘土吸附水，使总束缚水含量增加；地层水矿化度偏高；亲水岩石表面形成水膜，成为导电通道等。介绍了定性评价方法。在定量解释中，用Ｓ－Ｂ新模型计算含水饱和度，用曲１０井的实际资料验证认为此模型比阿尔奇公式好。
Logging response characteristics of low resistivity reservoirs are not obvious, their resistivity values are very low, and sometimes lower than the resistivity of the surrounding rock. Occasions have occurred that the reservoir was mistakenly interpreted or missed. The lithology, physical property, oiliness and electrical characteristics of the low resistivity reservoirs in the third and the fourth Shahejie of Quti Oilfield are analyzed. The reason for the low resistivity is that the irreducible water content is high, the illite clay adsorbs water and the total Bound water content increased; formation water salinity is high; hydrophilic rock surface water film, a conductive channel. Introduced the qualitative evaluation method. In the quantitative interpretation, the new model S-B is used to calculate the water saturation. According to the actual data of Qu 10 well, this model is better than Archie’s formula.