地层水电阻率是测井解释中一个极其重要的参数，以纯地层条件推导的用于确定地层水电阻率的自然电位理论模型不适合泥质砂岩地层。
The therical water saturation model in shaly sandstone is derived from HB equation under the consideration of many factors that affect the reservoir conductance.
对含纯淡水或者地层水矿化度不太高的地层，可采用纯淡水的参数值。
The values of above mentioned parameters of pure water may be adopted for the strata only containing pure or low mineralization water.
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