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Optimizing near-orthogonal air-gun firing sequences for marine simultaneous source separation

Moritz B. Mueller, David F. Halliday, Dirk-Jan van Manen and Johan O. A. Robertsson
Optimizing near-orthogonal air-gun firing sequences for marine simultaneous source separation
Geophysics (November 2016) 81 (6): V415-V423

Abstract

Air-gun arrays can be encoded by firing individual air guns sequentially over a range of time. This marine source encoding is shown to be particularly beneficial for simultaneous source separation, which can exploit the orthogonality of the encoding sequences to improve the source separation. We have developed a method to design encoding sequences for air-gun arrays having minimized crosscorrelation and optimized autocorrelation properties. By varying the firing times of the individual air-gun subelements, different encoding sequences are constructed using a simulated annealing approach so that their orthogonality properties are optimized. These optimized sequences are then used for time-dithered simultaneous source encoding. Realistic synthetic data examples show a significant improvement of simultaneous source separation. We have also determined the robustness of the method for take-off angle variations and possible errors in sequence estimation.


ISSN: 0016-8033
EISSN: 1942-2156
Coden: GPYSA7
Serial Title: Geophysics
Serial Volume: 81
Serial Issue: 6
Title: Optimizing near-orthogonal air-gun firing sequences for marine simultaneous source separation
Affiliation: Eidgenoessische Technische Hochschule Zuerich, Institute of Geophysics, Zurich, Switzerland
Pages: V415-V423
Published: 201611
Text Language: English
Publisher: Society of Exploration Geophysicists, Tulsa, OK, United States
References: 19
Accession Number: 2016-106625
Categories: Applied geophysics
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: illus. incl. 1 table
Secondary Affiliation: Schlumberger Gould Research, USA, United States
Country of Publication: United States
Secondary Affiliation: GeoRef, Copyright 2017, American Geosciences Institute. Reference includes data from GeoScienceWorld, Alexandria, VA, United States. Reference includes data supplied by Society of Exploration Geophysicists, Tulsa, OK, United States
Update Code: 201651
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