176 citations · 495 across the 18 of their papers we have counts for
15 papers · 1 filter
Impacts of magnetic permeability on electromagnetic data collected in settings with steel-cased wells
Lindsey J. Heagy, Douglas W. Oldenburg
Electromagnetic methods are increasingly being applied in settings with steel infrastructure. These include applications such as monitoring of CO2 sequestration or even assessing t…
MTH5: an archive and exchangeable data format for magnetotelluric time series data
Jared Peacock, Karl Kappler, Lindsey Heagy +3
Magnetotellurics (MT) is a passive electromagnetic geophysical method that measures variations in subsurface electrical resistivity. MT data are collected in the time domain and pr…
Geophysical Electromagnetics: A retrospective, DISC 2017, and a look forward
Douglas W. Oldenburg, Lindsey J. Heagy, Seogi Kang
Geophysical electromagnetics (EM) plays an important role in mineral exploration and is increasingly being used to help solve other problems of relevance to society. In this articl…
Geophysical inversions to delineate rocks with CO sequestration potential through carbon mineralization
Lindsey J. Heagy, Thibaut Astic, Joseph Capriotti +2
In addition to reducing anthropogenic emissions of CO, it is increasingly clear we also need to remove CO from the atmosphere in order to avoid some of the worst case scena…
Electrical and electromagnetic responses over steel-cased wells
Lindsey J. Heagy, Douglas W. Oldenburg
Electrical and electromagnetic (EM) methods can be diagnostic geophysical imaging tools for monitoring applications, such as carbon capture and storage or hydraulic fracturing. In…
Hybrid parametric/smooth inversion of electrical resistivity tomography data
Teddi Herring, Lindsey J. Heagy, Adam Pidlisecky +1
The standard smooth electrical resistivity tomography inversion produces an estimate of subsurface conductivity that has blurred boundaries, damped magnitudes, and often contains i…
Towards an open-source landscape for 3D CSEM modelling
Dieter Werthmüller, Raphael Rochlitz, Octavio Castillo-Reyes +1
Large-scale modelling of three-dimensional controlled-source electromagnetic (CSEM) surveys used to be feasible only for large companies and research consortia. This has changed ov…
Petrophysically and geologically guided multi-physics inversion using a dynamic Gaussian mixture model
Thibaut Astic, Lindsey J. Heagy, Douglas W. Oldenburg
In a previous paper, we introduced a framework for carrying out petrophysically and geologically guided geophysical inversions. In that framework, petrophysical and geological info…
Detecting induced polarization effects in time-domain data: a modeling study using stretched exponentials
Seogi Kang, Douglas W. Oldenburg, Lindsey J. Heagy
The potential for extracting and interpreting induced polarization (IP) data from airborne surveys is now broadly recognized. There is, however, still considerable discussion about…
3D electromagnetic modelling and inversion: A case for open-source
Douglas W. Oldenburg, Lindsey J. Heagy, Seogi Kang +1
Electromagnetics has an important role to play in solving the next generation of geoscience problems. These problems are multidisciplinary, complex, and require collaboration. This…
Open source software for simulations and inversions of airborne electromagnetic data
Lindsey J. Heagy, Seogi Kang, Rowan Cockett +1
Inversions of airborne EM data are often an iterative process, not only requiring that the researcher be able to explore the impact of changing components such as the choice of reg…
Direct current resistivity with steel-cased wells
Lindsey J. Heagy, Douglas W. Oldenburg
The work in this paper is motivated by the increasing use of electrical and electromagnetic methods in geoscience problems where steel-cased wells are present. Applications of inte…
Modeling electromagnetics on cylindrical meshes with applications to steel-cased wells
Lindsey J. Heagy, Douglas W. Oldenburg
Simulating direct current resistivity, frequency domain electromagnetics and time domain electromagnetics in settings where steel cased boreholes are present is of interest across…
A numerical method for efficient 3D inversions using Richards equation
Rowan Cockett, Lindsey J. Heagy, Eldad Haber
Fluid flow in the vadose zone is governed by Richards equation; it is parameterized by hydraulic conductivity, which is a nonlinear function of pressure head. Investigations in the…
A framework for simulation and inversion in electromagnetics
Lindsey J. Heagy, Rowan Cockett, Seogi Kang +2
Simulations and inversions of electromagnetic geophysical data are paramount for discerning meaningful information about the subsurface from these data. Depending on the nature of…