Reconstructing salt geometry using 3D CSEM data

Luis Alberto Sanchez Perez; Martin Panzner; Humberto Salazar Soto

doi:10.3997/1365-2397.fb2020017

ISSN: 0263-5046
E-ISSN: 1365-2397

Reconstructing salt geometry using 3D CSEM data
Authors Luis Alberto Sanchez Perez¹, Martin Panzner², Humberto Salazar Soto³
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Affiliations: ¹ EMGS Americas ² EMGS ASA ³ PEMEX
Source: First Break, Volume 38, Issue 3, Mar 2020, p. 43 - 47
DOI: https://doi.org/10.3997/1365-2397.fb2020017
- Published online: 01 Mar 2020

Abstract

In this paper we demonstrate the imaging capabilities of a newly developed 3D Gauss-Newton inversion algorithm for marine controlled source electromagnetic (CSEM) data by inverting synthetic data generated from a known salt resistivity model. We show that the high resistivity contrast between salt and background sediments can be utilized to reconstruct reliable images of the salt structure without the use of any a-priori information which could bias the outcome. Further, we re-invert a CSEM data set acquired in 2012 in the Salina basin in the Gulf of Mexico, using the same 3D Gauss-Newton inversion algorithm. The resulting resistivity model is compared to the initial salt interpretation based on seismic data. The top salt boundary in the inverted resistivity model correlates well with the initial interpretation. However, the base salt geometry, which is often difficult to map with seismic data alone, is imaged very differently. The CSEM inversion result is robust and independent of other geophysical data and therefore very valuable in a salt imaging workflow to support seismic interpretation and velocity model building.

EAGE Publications BV

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2020-03-01

2024-04-19

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Reconstructing salt geometry using 3D CSEM data

First Break 38, 43 (2020); https://doi.org/10.3997/1365-2397.fb2020017

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Reconstructing salt geometry using 3D CSEM data

Abstract

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