TY - JOUR
T1 - Directional induction logging for evaluating layered magnetic formations
AU - Cheryauka, Arvidas B.
AU - Sato, Motoyuki
N1 - Funding Information:
We thank Y. Antonov and M. Epov from the Institute for Geophysics, Novosibirsk, Russia, for useful discussion and comments. Funding for these studies was provided by the International Communication Foundation; the Japan Ministry of Education, Culture and Sport (Grant-in Aid for Scientific Research no. 08555253); and the United Institute for Geology, Geophysics and Mineralogy, Siberian Branch of the Russian Academy of Sciences (research project 07'98-99).
PY - 2002
Y1 - 2002
N2 - We present a modeling study to investigate the ability of directional induction logging to evaluate magnetic properties of formations. Simultaneous measurement of in-phase and quadrature components of electromotive force, or R- and X-signals, respectively, gives complete information about both the electrical resistivity and the magnetic susceptibility of the formation. We describe an approach for designing a directional induction tool with tilted transmitting and receiving coils. We discuss spatial resolution using directional excitation-measurement and evaluation of formation parameters. The proposed method can detect magnetic susceptibility inhomogeneity in addition to electrical resistivity inhomogeneity using the X-signal. The X-signal log response reflects abrupt changes in magnetic properties, with sharp gradients located in the vicinity of magnetic susceptibility interfaces.
AB - We present a modeling study to investigate the ability of directional induction logging to evaluate magnetic properties of formations. Simultaneous measurement of in-phase and quadrature components of electromotive force, or R- and X-signals, respectively, gives complete information about both the electrical resistivity and the magnetic susceptibility of the formation. We describe an approach for designing a directional induction tool with tilted transmitting and receiving coils. We discuss spatial resolution using directional excitation-measurement and evaluation of formation parameters. The proposed method can detect magnetic susceptibility inhomogeneity in addition to electrical resistivity inhomogeneity using the X-signal. The X-signal log response reflects abrupt changes in magnetic properties, with sharp gradients located in the vicinity of magnetic susceptibility interfaces.
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U2 - 10.1190/1.1468602
DO - 10.1190/1.1468602
M3 - Article
AN - SCOPUS:0036494420
VL - 67
SP - 427
EP - 437
JO - Geophysics
JF - Geophysics
SN - 0016-8033
IS - 2
ER -