Three-dimensional controlled-source electromagnetic and magnetotelluric joint inversion

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The growing use of the controlled-source electromagnetic method (CSEM) and magnetotellurics (MT) for exploration applications has been driving the development of data acquisition technologies, and three-dimensional (3-D) modeling and imaging techniques. However, targeting increasingly complex geological environments also further enhances the problems inherent in large-scale inversion, such as non-uniqueness and resolution issues. In this paper, we report on two techniques to mitigate these problems. We use 3-D joint CSEM and MT inversion to improve the model resolution. To avoid the suppression of the resolution capacities of one data type, and thus to balance the use of inherent, and ideally complementary ... continued below

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Commer, M. & Newman, G.A. February 15, 2009.

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The growing use of the controlled-source electromagnetic method (CSEM) and magnetotellurics (MT) for exploration applications has been driving the development of data acquisition technologies, and three-dimensional (3-D) modeling and imaging techniques. However, targeting increasingly complex geological environments also further enhances the problems inherent in large-scale inversion, such as non-uniqueness and resolution issues. In this paper, we report on two techniques to mitigate these problems. We use 3-D joint CSEM and MT inversion to improve the model resolution. To avoid the suppression of the resolution capacities of one data type, and thus to balance the use of inherent, and ideally complementary information content, different data reweighting schemes are proposed. Further, a hybrid model parameterization approach is presented, where traditional cell-based model parameters are used simultaneously within a parametric inversion. The idea is to limit the non-uniqueness problem, typical for 3-D imaging problems, in order to allow for a more focusing inversion. The methods are demonstrated using synthetic data generated from models with a strong practical relevance.

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  • Journal Name: Geophysical Journal International; Journal Volume: 178; Journal Issue: 3

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  • Report No.: LBNL-1757E
  • Grant Number: DE-AC02-05CH11231
  • DOI: 10.1111/j.1365-246X.2009.04216.x | External Link
  • Office of Scientific & Technical Information Report Number: 960378
  • Archival Resource Key: ark:/67531/metadc932883

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  • February 15, 2009

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  • Nov. 13, 2016, 7:26 p.m.

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  • Sept. 29, 2017, 5:59 p.m.

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Commer, M. & Newman, G.A. Three-dimensional controlled-source electromagnetic and magnetotelluric joint inversion, article, February 15, 2009; Berkeley, California. (https://digital.library.unt.edu/ark:/67531/metadc932883/: accessed May 19, 2019), University of North Texas Libraries, Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.