We describe a new experimental setup which enable measurement dielectric response of rock cores at different saturation. The experimental setup combines the well-known steady-state core flooding technique and measurement of the S11 scatter functions.

We derive the equations describing the scatter functions for a multisection coaxial transmission line ended in lossy media. We consider the case when the transmission line contains a coaxial sample holder.

Based on the theoretical model of the scatter function, we developed a procedure for the calculation of the frequency-dependent complex dielectric permittivity of rock cores from the scatter functions.

The complex dielectric permittivity of brines, oil and dry sandstone, as well as complex dielectric permittivity of brine-saturated sandstone, obtained from experimental measurements and numerical optimization process are also presented.

We observed high dielectric losses in brine-saturated sandstone. The effects of brine concentration on dielectric losses are however not significant.

Keywords:
coefficient, network analyzer, experimental setup, dielectric parameter, reservoir characterization, dielectric permittivity, multiple reflection coefficient, sample holder, frequency, spe 48903
Subjects:
Drilling Operations, Reservoir Characterization, Reservoir Fluid Dynamics, Coring, fishing, Flow in porous media
Copyright 1998, Society of Petroleum Engineers
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