A parallel adaptive finite-element approach for 3-D realistic controlled-source electromagnetic problems using hierarchical tetrahedral grids

Z Liu, Z Ren, H Yao, J Tang, X Lu… - Geophysical Journal …, 2023‏ - academic.oup.com
To effectively and efficiently interpret or invert controlled-source electromagnetic (CSEM)
data which are recorded in areas with the kind of complex geological environments and …

3-D inversion of transient EM data with topography using unstructured tetrahedral grids

Y Liu, C Yin, C Qiu, Z Hui, B Zhang… - Geophysical Journal …, 2019‏ - academic.oup.com
The transient electromagnetic (TEM) data acquired in mountainous area are seriously
affected by topography, implying that consideration of topographic effect in the interpretation …

3D multinary inversion of controlled-source electromagnetic data based on the finite-element method with unstructured mesh

H Cai, Z Long, W Lin, J Li, P Lin, X Hu - Geophysics, 2021‏ - library.seg.org
In controlled-source electromagnetic (CSEM) inversion with conventional regularization, the
reconstructed conductivity image is usually blurry and only has limited resolution. To …

Effects of full transmitting-current waveforms on transient electromagnetics: Insights from modeling the Albany graphite deposit

S Zeng, X Hu, J Li, CG Farquharson… - …, 2019‏ - pubs.geoscienceworld.org
In transient electromagnetic (TEM) methods, the full transmitting-current waveform, not just
the abrupt turn-off, can have effects on the measured responses. A 3D finite-element time …

Three-dimensional modeling of frequency-and time-domain electromagnetic methods with induced polarization effects

Y Qi, H El-Kaliouby, A Revil, AS Ahmed… - Computers & …, 2019‏ - Elsevier
Electrical conduction describes the ability of porous media to conduct electrical charges and
induced polarization (IP) describes their ability to reversibly store electrical charges. An …

3D electromagnetic modeling of graphitic faults in the Athabasca Basin using a finite-volume time-domain approach with unstructured grids

X Lu, CG Farquharson, JM Miehé… - Geophysics, 2021‏ - pubs.geoscienceworld.org
Uranium exploration in the Athabasca Basin, Canada, relies heavily on ground-based
transient electromagnetic (TEM) surveys to target thin, steeply dip** graphitic conductors …

3D finite-volume time-domain modeling of geophysical electromagnetic data on unstructured grids using potentials

X Lu, CG Farquharson - Geophysics, 2020‏ - pubs.geoscienceworld.org
Unstructured grids are capable of faithfully representing real-life geologic models and
topography with relatively few mesh cells. We have developed a finite-volume solution to the …

1D geological imaging of the subsurface from geophysical data with Bayesian Evidential Learning

H Michel, F Nguyen, T Kremer, A Elen… - Computers & …, 2020‏ - Elsevier
Imaging the subsurface of the Earth is of prime concern in geosciences. In this scope,
geophysics offers a wide range of methods that are able to produce models of the …

Three-dimensional ground TEM inversion over a topographic earth considering ramp time

YF QI, QQ ZHI, X LI, X JING, ZP QI, NQ SUN… - Chinese Journal of …, 2021‏ - en.dzkx.org
The topography and transmitting ramp time has serious effects on the ground transient
electromagnetic (TEM) data, which brings big challenges to the traditional TEM …

A block rational Krylov method for 3-D time-domain marine controlled-source electromagnetic modelling

C Qiu, S Güttel, X Ren, C Yin, Y Liu… - Geophysical Journal …, 2019‏ - academic.oup.com
We introduce a novel block rational Krylov method to accelerate 3-D time-domain marine
controlled-source electromagnetic modelling with multiple sources. This method …