Open AccessNumerical Analysis Of Three Component Induction Logging In Geothermal Reservoirs
Author(s) -
David Alumbaugh
Publication year - 2002
Language(s) - English
Resource type - Reports
DOI - 10.2172/791563
Subject(s) - borehole , geothermal gradient , solenoid , geology , component (thermodynamics) , field (mathematics) , moment (physics) , electromagnetic induction , geophysics , engineering , mechanical engineering , physics , electrical engineering , geotechnical engineering , electromagnetic coil , mathematics , classical mechanics , pure mathematics , thermodynamics
This project is supporting the development of the ''Geo-Bilt'', geothermal electromagnetic-induction logging tool that is being built by ElectroManetic Instruments, Inc. The tool consists of three mutually orthogonal magnetic field antennas, and three-component magnetic field receivers located at different distances from the source. In its current configuration, the source that has a moment aligned along the borehole axis consists of a 1m long solenoid, while the two trans-axial sources consist of 1m by 8cm loops of wire. The receivers are located 2m and 5m away from the center of the sources, and five frequencies from 2 kHz to 40 kHz are being employed. This study is numerically investigating (1) the effect of the borehole on the measurements, and (2) the sensitivity of the tool to fracture zone-geometries that might be encountered in a geothermal field. The benefits of the results are that they will lead to a better understanding of the data that the tool produces during its testing phase and an idea of what the limitations of the tool are