The potential of fracture imaging using high-frequency, single-hole electromagnetic data

摘要

This paper presents an inversion scheme for high- frequency electromagnetic(EM)data from a single borehole for detection and characterization of fluid- filled fractures. Water in the fracture zone may be char- acterized by its high electrical permittvity and, if saline, by high electrical conductivity. High electrical conductiv- ity results in increase attenuation of EM fields, whereas high electrical permittivity reduces the phase velocity of propagating EM fields. Taking advantage of these effects, we use high-frequency EM fields to detect and charac- terize fluid-filled fractures.