Open AccessDetermination of formation dip and strike from transient LWD electromagnetic measurements
Author(s) -
M. N. Nikitenkoч,
Michael Rabinovich,
Mikhail Sviridov
Publication year - 2022
Publication title -
geofizičeskie tehnologii
Language(s) - English
Resource type - Journals
ISSN - 2619-1563
DOI - 10.18303/2619-1563-2021-2-36
Subject(s) - inversion (geology) , geology , transient (computer programming) , magnetic dip , time domain , magnetotellurics , algorithm , geophysics , electrical resistivity and conductivity , computer science , seismology , engineering , electrical engineering , tectonics , computer vision , operating system
An original method has been developed for estimating formation dip and strike from transient induction LWD data, based on focusing in the time domain. The focusing consists in decomposing the measured signals into a time series and diagonalizing the matrix of focused magnetic field components. We have implemented the method and comprehensively tested it in horizontally-layered media used for LWD data inversion to solve geosteering problems and evaluate the formation resistivity. Estimates of the angles contribute to reliable geosteering when choosing a direction of drilling, as well as when inverting data for a complex earth model. A significant reduction in the resource intensity of inversion and model equivalence is achieved by reducing the number of determined parameters.