Resolving complex velocity and gas absorption features with fullwaveform inversion in the Taranaki Basin, New Zealand

Yuelian Gong; Dominic Fell; Robert Hunn; Richard Bisley; Alexander Karvelas; Bee Jik Lim

doi:10.1080/22020586.2019.12073076

2nd Australasian Exploration Geoscience Conference: Data to Discovery

ISSN: 2202-0586
E-ISSN:

oa Resolving complex velocity and gas absorption features with fullwaveform inversion in the Taranaki Basin, New Zealand
Authors Yuelian Gong^a, Dominic Fell^b, Robert Hunn^c, Richard Bisley^d, Alexander Karvelas^e and Bee Jik Lim^f
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^a WesternGeco, Level 5, 256 St Georges Terrace Perth, WA, 6000, , Australia, [email protected] ^b WesternGeco, Level 5, 256 St Georges Terrace Perth, WA, 6000, , Australia, [email protected] ^c WesternGeco, Level 5, 256 St Georges Terrace Perth, WA, 6000, , Australia, [email protected] ^d WesternGeco, Level 5, 256 St Georges Terrace Perth, WA, 6000, , Australia, [email protected] ^e WesternGeco, Level 5, 256 St Georges Terrace Perth, WA, 6000, , Australia, [email protected] ^f WesternGeco, Level 5, 256 St Georges Terrace Perth, WA, 6000, , Australia, [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 - 3
DOI: https://doi.org/10.1080/22020586.2019.12073076
- Published online: 01 Dec 2019

Abstract

Summary

The Western Platform multiclient survey is in the Taranaki Basin, offshore New Zealand. Legacy imaging efforts have suffered due to being unable to overcome the presence of multiple geological challenges. A complex shallow overburden across the survey area, in addition to The Cape Egmont Fault Zone, provide a significant challenge to velocity model building. Shallow gas clouds are also prevalent throughout the survey, impacting imaging at the key zones of interest.

To address these challenges, full-waveform and common image point tomography were performed to derive a high-resolution velocity model. Q-FWI was used to derive a detailed Q model representing the shallow gas bodies.

In this case study, we demonstrate the successful application of diving-wave FWI, Q-FWI, and FWI using reflection energy to resolve a high-resolution velocity and Q model. This detailed model enabled the final imaging performed with Q-Kirchhoff prestack depth migration to compensate for the complex kinematics and gas-related absorption effects observed in the survey.

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References

Cheng, X., Kun, J., Sun, D. and Vigh, D., 2015, A new approach of visco-acoustic waveform inversion in the time domain: 85th Annual International Meeting, SEG, Expanded Abstracts, 1183-1187.
Menzel-Jones, G., 2015, Application of Full Waveform Inversion and Q-Tomography for earth model building: shallow water, shallow gas case study: APGCE 2015, 25831.
Mora, P., 1989, Inverion = migration + tomograpy: Geophysics, 54, 1575-1586.
Sun, D., Kun, J., Sun, D. and Vigh, D., 2016, Reflection based Waveform Inversion: 86th Annual International Meeting, SEG, Expanded Abstracts, Expanded Abstracts, 1151-1156.
Sun, D., Kun, J., Cheng, X. and Vigh, D., 2018, Keys to robust reflection-based full-waveform inversion: 88th Annual International Meeting, Expanded Abstracts, 1283-1287.
Xie, Y., Wang, N.I.L., Xiao, N.I.L. and Latter, N.I.L., 2018, Recent advances in Q model building and Q-compensating migration for imaging in the presence of complex gas clouds using P waves: 80th EAGE Conference & Exhibition, Expanded Abstracts, WS07.

/content/journals/10.1080/22020586.2019.12073076

Article Type: Research Article

Keyword(s): gas cloud imaging; least-square reflections full waveform inversion; Q-full-waveform inversion; velocity model building

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oa Resolving complex velocity and gas absorption features with fullwaveform inversion in the Taranaki Basin, New Zealand

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