为正确解释评价区域页岩气储层，探讨了低电阻率页岩气储层的形成机理。结合大量区域页岩地层的测井特征和地质特点，主要分析了黏土含量、黄铁矿含量、页岩中有机质的成熟度、地层可动水及矿化度、页理（层理、裂缝）等对页岩气地层电阻率的影响，结果表明形成低电阻率页岩储层的原因多，不同区块低电阻率页岩储层的形成机理不同，在实际页岩气井的综合解释评价中得到应用和检验。低阻页岩储层的形成机理和影响因素有“五高”，即：黏土含量高、地层水矿化度高、有机质成熟度高、黄铁矿含量高、页理（层理、裂缝）发育程度高，同时这些影响因素大多相互叠加。
This paper makes an approach to the formation mechanism of the low resistivity shale reservoirs for exactly interpreting the regional shale gas reservoirs.Combined with the synthetic log data and geological characteristics of many regional shale layers,the paper analyzes the influence of the clay content,pyrite content,the organic matter maturity,the reservoir movable water and its degree of mineralization,and the shale lamina(layer lamina,fracture)on the resistivity of the shale gas reservoirs.The result indicates that there are many influential factors to cause low resistivity shale reservoirs.The formation mechanism of the shale reservoir is different in different zones.This conclusion is applied and verified in the synthetic interpretation of shale gas wells.The formation mechanism and influential factors of the low resistivity gas shale reservoirs are “five highness ”, namely,high content clay,high degree mineralization of water,over mature organic matter,more pyrite,and more shale lamina (layer lamina,fracture).At the same time,these influential factors are frequently superposition.
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