Rigorous 3D inversion of marine magnetotelluric data in the area with complex bathymetry

Zhdanov, Michael S.; Wan, Le; Gribenko, Alexander; C̆uma, Martin; Key, Kerry; Constable, Steven

doi:10.1190/1.3255858

Cited by 7 publications

(2 citation statements)

References 10 publications

(9 reference statements)

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“…Recent field tests of the CSEM method have indicated a strong sensitivity to the presence of hydrate (Schwalenberg et al 2005(Schwalenberg et al , 2010aWeitemeyer et al 2006;Weitemeyer 2008). Zach and Brauti (2009) discuss the CSEM sensitivity to shallow gas hydrates from the perspective of how it might corrupt the imaging of deeper hydrocarbon reservoirs. Similar to the study by Sasaki and Meju (2009), they show that phase data is less perturbed by shallow resistors than amplitude data, likely due to the lack of inductive effects in these electromagnetically thin resistors.…”

Section: Mapping Gas Hydrates and Shallow Structurementioning

confidence: 98%

Marine Electromagnetic Studies of Seafloor Resources and Tectonics

Key

2011

Surv Geophys

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The past decade has been a period of rapid growth for marine electromagnetic (EM) methods, predominantly due to the industrial adoption and promotion of EM as a valuable tool for characterizing offshore hydrocarbon reservoirs. This growth is illustrated by a database of marine EM publications spanning from the early developments in the 1960's to the present day; while over 300 peer-reviewed papers on marine EM have been published to date, more than half of these papers have been published within the last decade. This review provides an overview of these recent developments, covering industrial and academic use of marine EM for resource exploration and tectonic investigations, ranging from acquisition technology and modeling approaches to new physical and geological insights learned from recent data sets.

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Section: Mapping Gas Hydrates and Shallow Structurementioning

confidence: 98%

Marine Electromagnetic Studies of Seafloor Resources and Tectonics

Key

2011

Surv Geophys

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“…Most of these use 1D or 2D MT modeling or inversion for imaging salt structures. Zhdanov et al (2009) present a fully 3D inversion algorithm, which they apply to marine MT data collected in the Gemini Prospect, Gulf of Mexico. They show that their code can map resistive structures like a salt dome with reasonable accuracy.…”

Section: Introductionmentioning

confidence: 99%

Detecting a salt dome overhang with magnetotellurics: 3D inversion methodology and synthetic model studies

2012

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Detecting a salt dome overhang is known to be problematic by seismic methods alone. We used magnetotellurics (MT) as a complementary method to seismics to investigate the detectability of a salt dome overhang. A comparison of MT responses for 3D synthetic salt models with and without overhang shows that MT is very sensitive to shallow salt structures and suggests that it should be possible to detect an overhang. To further investigate the resolution capability of MT for a salt dome overhang, we performed a 3D MT inversion study and investigated the impact of model parametrization and regularization. We showed that using the logarithms of the conductivities as model parameters is crucial for inverting data from resistive salt structures because, in this case, commonly used Tikhonov-type stabilizers work more equally for smoothing the resistive and conductive structures. The use of a logarithmic parametrization also accelerated the convergence and produced better inversion results. When the Laplace operator was used as a regularization functional, we still observed that the inversion algorithm allows spatial resistivity gradients. These spatial gradients are reduced if a regularization based on first derivatives in contrast to the Laplace operator is introduced. To demonstrate the favorable performance when logarithmic parametrization and gradient-based regularization are employed, we first inverted a data set simulated for a simple model of two adjacent blocks. Subsequently, we applied the code to a more realistic salt dome overhang detectability study. The results from the detectability study are encouraging and suggest that 3D MT inversion can be applied to decide whether the overhang is present in the shallow salt structure even in the case when only profile data are available. However, to resolve the overhang, a dense MT site coverage above the flanks of the salt dome is required.

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Robust Synthetic Aperture Imaging of Marine Controlled-Source Electromagnetic Data

Zhdanov

2020

IEEE Trans. Geosci. Remote Sensing

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Rigorous 3D inversion of marine magnetotelluric data in the area with complex bathymetry

Cited by 7 publications

References 10 publications

Marine Electromagnetic Studies of Seafloor Resources and Tectonics

Marine Electromagnetic Studies of Seafloor Resources and Tectonics

Detecting a salt dome overhang with magnetotellurics: 3D inversion methodology and synthetic model studies

Robust Synthetic Aperture Imaging of Marine Controlled-Source Electromagnetic Data

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