oa Permittivity Measurement Using Borehole Radar from Single Hole

This paper provides a method for measuring permittivity using borehole radar from single hole. First we use numerical simulation to examine the suitability of borehole radar for measuring relative permittivity from single hole. We introduce a 2-D pseudospectral time domain (PSTD) algorithm that allows us to model the full EM wavefield for rotationally symmetric structure. The effect of the borehole mud and the response of surrounding formation are simulated. lt is found that the relative permittivity logging curve is sensitive to the formation interface of surrounding formation. The simulation results show that the measured relative permittivity is closed to the true parameters of the surrounding formation. We processed field data using a variance fractal dimension technique that can detect coherent borehole radar signal from background noise. The measured relative permittivity logging curve could be useful for identifying formation type and detecting water-bearing property.