All that wobbles isn’t necessarily azimuthal anisotropy

Helen Debenham; Jennifer Badry; Mohamed Megebry

doi:10.1080/22020586.2019.12073227

2nd Australasian Exploration Geoscience Conference: Data to Discovery

ISSN: 2202-0586
E-ISSN:

oa All that wobbles isn’t necessarily azimuthal anisotropy
Authors Helen Debenham^a, Jennifer Badry^b and Mohamed Megebry^c
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^a Buru Energy, Level 2, 16 Ord St, West Perth 6005, [email protected] ^b DownUnder GeoSolutions, 76 Kings Park Rd, West Perth 6005, [email protected] ^c DownUnder GeoSolutions, 76 Kings Park Rd, West Perth 6005, [email protected]
Publisher: Australian Society of Exploration Geophysicists
Source: ASEG Extended Abstracts, Volume 2019, Issue 2nd Australasian Exploration Geoscience Conference: Data to Discovery, Dec 2019, p. 1 - 7
DOI: https://doi.org/10.1080/22020586.2019.12073227
- Published online: 01 Dec 2019

Abstract

Summary

Onshore 3D seismic data is often acquired with rich azimuth coverage by utilising orthogonal shooting (or cross-spread) layouts. This means that azimuthal anisotropy, if present, can be readily observed and its effects on the data can be quantified and accounted for as part of the processing and imaging flow.

In this example from the Canning Basin, the data appeared initially to be exhibiting the effects of azimuthal anisotropy. However, with careful handling and honouring of the azimuths of the acquired data during the PreSDM velocity model building, it was possible to correct for most of the variation simply with a laterally variable velocity model, without the need to invoke the presence of azimuthal anisotropy.

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References

Bartana, A., D. Kosloff, P. Riste, and Y. Vilenchik, 2009, Resolution of small velocity anomalies by wide azimuth reflection data tomography: 79th Annual International Meeting, SEG, Expanded Abstracts, 4059–4063.
Bartana, A., D. Kosloff, and Y. Hollander, 2011, Automatic picking of delays on 3D angle gathers: 80th Annual International Meeting, SEG, Expanded Abstracts, 3903–3907,
Craft, K.L., Mallick, S., Meister, L.J. and Van Dok, R., 1997, Azimuthal anisotropy analysis from P-wave seismic traveltime data: 67th Ann. Internat. Mtg., Soc. of Expl. Geophys., 1214 – 1216.
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Koren, Z., and I. Ravve, 2014, Azimuthally dependent anisotropic velocity model update: Geophysics, 79, C27–C53,
Sharma, Y., 2017, Realizing the benefits of WAZ processing: A case study from Cambay Basin, India: SPG extended abstracts
Zimine, S., G. Lambaré, P. Guillaume, J.P. Montel, J.P. Touré, N. Deladerrière, X. Zhang, A. Prescott, D. Lecerf, S. Navion, J.L. Boelle, A. Belmokhtar and A. Ladmek, 2010. Can we solve RMO azimuthal variations for land WAZ, with a nonlinear tomography solution in depth? A case history. EAGE Extended abstracts.

/content/journals/10.1080/22020586.2019.12073227

Article Type: Research Article

Keyword(s): anisotropy; azimuthal; Canning Basin; onshore seismic

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oa All that wobbles isn’t necessarily azimuthal anisotropy

Abstract

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