Research output: Contribution to journal › Article › peer-review
Signals of a resistivity logging tool with toroidal coils: physical and mathematical modeling. / Михайлов, Игорь Владиславович; Ошлыков, И.С.; Суродина, Ирина Владимировна et al.
In: Russian Geology and Geophysics, Vol. 66, No. 6, 9, 2025, p. 790-802.Research output: Contribution to journal › Article › peer-review
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TY - JOUR
T1 - Signals of a resistivity logging tool with toroidal coils: physical and mathematical modeling
AU - Михайлов, Игорь Владиславович
AU - Ошлыков, И.С.
AU - Суродина, Ирина Владимировна
AU - Никитенко, Марина Николаевна
AU - Глинских, Вячеслав Николаевич
N1 - The research was carried out with the financial support of Russian Federal Research Project No. FWZZ-2022-0026 “Innovative aspects of electrodynamics inproblems of exploration and oilfield geophysics.” The authors thank the specialists of the Scientifiс and Production Enterprise of Geophysical Equipment Looch for their active participation in the physical experiments described in the article. EDN JOCQXC.
PY - 2025
Y1 - 2025
N2 - The study compares in detail the signals of an electromagnetic tool with toroidal coils which were measured in an electrolytic tank with a borehole and numerically calculated in its three-dimensional geoelectric model. For each electrical resistivity of the electrolyte, we performed the profiling of the air–tank and tank–borehole boundaries during round-trips of the tool. The values of the coupling coefficient of the measured and modeled signals have been determined for the entire set of frequencies and positions of the measuring coils in the summary and differential operating regimes. We have identified a pair of signals with a virtually constant coupling coefficient at varying electrolyte mineralization. Drawing on this pair, transformations of the tool signals into the apparent electrical resistivities of the geoenvironment have been constructed. The resulting transformation graphs allow a reliable recalculation of the measured signals of the toroidal tool into the apparent electrical resistivity distribution in the near-wellbore space, which is necessary for the petrophysical interpretation of the field log data.
AB - The study compares in detail the signals of an electromagnetic tool with toroidal coils which were measured in an electrolytic tank with a borehole and numerically calculated in its three-dimensional geoelectric model. For each electrical resistivity of the electrolyte, we performed the profiling of the air–tank and tank–borehole boundaries during round-trips of the tool. The values of the coupling coefficient of the measured and modeled signals have been determined for the entire set of frequencies and positions of the measuring coils in the summary and differential operating regimes. We have identified a pair of signals with a virtually constant coupling coefficient at varying electrolyte mineralization. Drawing on this pair, transformations of the tool signals into the apparent electrical resistivities of the geoenvironment have been constructed. The resulting transformation graphs allow a reliable recalculation of the measured signals of the toroidal tool into the apparent electrical resistivity distribution in the near-wellbore space, which is necessary for the petrophysical interpretation of the field log data.
KW - ЭЛЕКТРОМАГНИТНЫЙ КАРОТАЖ
KW - ТОРОИДАЛЬНЫЕ КАТУШКИ
KW - ФИЗИЧЕСКОЕ МОДЕЛИРОВАНИЕ
KW - МАТЕМАТИЧЕСКОЕ МОДЕЛИРОВАНИЕ
KW - МЕТОД КОНЕЧНЫХ РАЗНОСТЕЙ
KW - ГЕОЭЛЕКТРИЧЕСКАЯ МОДЕЛЬ
KW - ПРОФИЛИРОВАНИЕ
KW - ТРАНСФОРМАЦИЯ СИГНАЛОВ
UR - https://elibrary.ru/item.asp?id=81399928
U2 - 10.2113/RGG20244827
DO - 10.2113/RGG20244827
M3 - Article
VL - 66
SP - 790
EP - 802
JO - Russian Geology and Geophysics
JF - Russian Geology and Geophysics
SN - 1068-7971
IS - 6
M1 - 9
ER -
ID: 67706928