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.
将这两个公式应用于测井解释，对解释泥质砂岩的双水模型作了有效的改进。
The data of experiment for shaly sands have computed with new function. The results show that the accuracy of the new function is higher than the "dual water" model function.
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