AN INVESTIGATION OF THE VARIABLE FREQUENCY DIPOLE-DIPOLE METHOD FOR DETERMINING SUBSURFACE RESISTIVITIES.
ELECTRICAL ENGINEERING RESEARCH LAB UNIV OF TEXAS AUSTIN
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In this report, the theoretical and some of the experimental features of the variable frequency dipole-dipole method of determining the electrical resistivities of the earths subsurface structures are investigated. This is essentially equivalent to determining the fields due to a dipole operated at frequencies ranging from DC to several hundred cycles in the presence of resistive inhomogeneities. Mathematical models consisting of homogeneous, isotropic layers are developed for the case when the source is an horizontal electric dipole and a vertical magnetic dipole. Normalized apparent resistivity curves are developed and compared with the equivalent curves one would obtain using the DC dipole method and the magnetotelluric method. It is shown that under certain conditions the variable frequency dipole-dipole method may be superior to them. Experimental data taken in the Delaware Basin, near Pecos, Texas is analyzed by comparison to layered models. The resulting models are compared to models obtained from well-logs and magnetotelluric data. Author
- Geology, Geochemistry and Mineralogy