Skip to Main Content
Skip Nav Destination
GEOREF RECORD

Implementing measured source signatures in a coarse-grid, finite-difference modeling scheme

Martin Landro, Rune Mittet and Roger Sollie
Implementing measured source signatures in a coarse-grid, finite-difference modeling scheme
Geophysics (December 1993) 58 (12): 1852-1860

Abstract

In a marine seismic air-gun array, each gun location does not necessarily coincide with a node in a finite-difference grid. Especially for coarse-grid, finite-difference modeling, this problem must be handled with care since there might be up to three or four air guns between adjacent grid points. The real sources are represented by fictitious monopole- and dipole source functions located at grid nodes. The effective sources are estimated from the extrapolated pressure field at a horizontal surface located below the sources. We find that an array consisting of eight guns separated by a distance of 3 m and located at 7.5 m depth can be approximated by six monopole- and dipole source functions distributed on a finite-difference grid with 10 m spatial sampling. The residual error energy norm between the actual wavefield and the corresponding finite-difference wavefield observed on a fictitious streamer placed at 95 m depth is less than 0.5 percent.


ISSN: 0016-8033
EISSN: 1942-2156
Coden: GPYSA7
Serial Title: Geophysics
Serial Volume: 58
Serial Issue: 12
Title: Implementing measured source signatures in a coarse-grid, finite-difference modeling scheme
Affiliation: IKU Sintef Group, Trondheim, Norway
Pages: 1852-1860
Published: 199312
Text Language: English
Publisher: Society of Exploration Geophysicists, Tulsa, OK, United States
References: 8
Accession Number: 1994-001746
Categories: Applied geophysics
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: illus.
Country of Publication: United States
Secondary Affiliation: GeoRef, Copyright 2017, American Geosciences Institute. Reference includes data supplied by Society of Exploration Geophysicists, Tulsa, OK, United States
Update Code: 199401
Close Modal

or Create an Account

Close Modal
Close Modal