低阻油层在王集油田分布广泛，由于油层与水层的电阻率对比度低，给测井解释带来了一定难度。 以岩心实验和地层水分析等资料为基础，对低阻油层的成因机理进行了分析。结果表明：地层水矿化度差 异、储层孔隙结构、薄层发育及钻井液侵入作用是导致油层低阻的主要因素。在此基础上，进一步总结了 针对该油田低电阻率油层的3 种识别方法，即交会法、感应与侧向联合法和侵入因子法。实践表明，这些 解释方法对该区低电阻率油层的识别和评价效果较好。

Lowresistivity oil layer are widely developed in Wangji Oilfield. Due to the lowcontrast ratio of resistivity between oil layer and water layer, the log interpretation is difficult. Based on core test and formation water analysis, this paper analyzed the origin of low resistivity reservoir. The result shows that formation water salinity divergence, pore structure, thin bed development and drillingmud intrusion are the main influencing factors for lowresistivity of reservoir. This paper summarized three kinds of interpretation methods to identify the lowresistivity oil layer, namely oil and water layer identification in cross plot, induction electrolog and lateral logging united method and invading factor method. The actual practice shows that these interpretation methods are suitable for the identification and evaluation of lowresistivity reservoir.