MODELLING OF THE DIELECTRIC LOGGING TOOL AT HIGH FREQUENCY.

The high-frequency dielectric logging tool has been used widely in electromagnetic well logging because, by measuring the dielectric constant at high frequencies (1 GHz), the water saturation of rocks could be known without having to measure the water salinity in the rocks. As such, it could be used to delineate fresh water bearing zones, as the dielectric constant of fresh water is much higher than that of oil while they may have the same resistivity. A computer model is presented based on numerical mode switching. The field is assumed to have three-dimensional variation while the inhomogeneity in the rock formation is assumed to have only two-dimensional variation. This two-and-one-half-dimensional problem is reduced to a one-dimensional problem through transformations.