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《Well Logging Technology》 1993-06
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Dielectric Properties of Bound Water in Shaly Sand

Feng Qining  
Difference between bound water and free water conductivities has been discussed in the litera- ture that concerns dual-water model for shaly sand.In this paper,mechanism of dielectric proper- ties of the water bound to the clay surface in shaly sand is expounded and the difference in dielec- tric properties between bound water and free water is given.Complex dielectric constant of bound water is calculated from a lot of measured data obtained from cores.The experimental results a- gree with theoretical analysis and thereby interpretation model of EPT is sophisticated by taking into account the experimental results.This model has been used in log interpretation in China oil fields.The values of residual hydrocarbon saturation(S_(or))and irreducible water saturation(S_(wirr)) of flushed zone calculated with the above model are in good agreement with the actual core analysis .An expanded application range of EPT is proposed,which is based on the above discussion.
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