Jackie Charles Sims

Laboratory measurement of dielectric constant near 20 MHz

A laboratory measurement system for determining the dielectric constant and resistivity of reservoir rocks is described. The system is composed of a computer-controlled RF analyzer and a capacitive sample holder, which operates in the frequency range from 2 MHz to 100 MHz. The sample is held at room temperature and pressure. Data is presented for carbonate rocks saturated with brine having resistivity ranging from near saturation to 5 ..omega..m. The results presented provide a means for interpreting dielectric log data by determining water-filled porosity from the dielectric constant and resistivity, which are derived from the tool data. This interpretation scheme will require additional data to account for temperature effects and to match variations in water-filled porosity to specific formations.

Complex dielectric interpretation of 20-MHz electromagnetic logs

An interpretation technique for the 20X10/sup 6/-cycle/sec (20-MHz) dielectric log based on the complex Lichtenecker-Rother (LR) equation is proposed. The equation is shown to be an adequate model of quarry rocks and is applied to field logs from the California coastal basins. The results are significantly better than those obtained with other techniques. The major disadvantage is that core data are required for calibration in each reservoir.