Velocity model estimation by full waveform inversion of time-lapse 4D passive seismic array data

Rie Kamei; David Lumley

doi:10.1071/ASEG2015ab155

24th International Geophysical Conference and Exhibition – Geophysics and Geology Together for Discovery

ISSN: 2202-0586
E-ISSN:

oa Velocity model estimation by full waveform inversion of time-lapse 4D passive seismic array data
Authors Rie Kamei^a and David Lumley^b
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^a University of Western AustraliaSchool of Physics, School of Earth and Environment, M004, 35 Stirling Hwy, Crawley, , 6009, , WA, , Australia, [email protected] ^b University of Western AustraliaSchool of Physics, School of Earth and Environment, M004, 35 Stirling Hwy, Crawley, , 6009, , WA, , Australia, [email protected]
Publisher: Australian Society of Exploration Geophysicists
Source: ASEG Extended Abstracts, Volume 2015, Issue 24th International Geophysical Conference and Exhibition – Geophysics and Geology Together for Discovery, Dec 2015, p. 1 - 4
DOI: https://doi.org/10.1071/ASEG2015ab155
- Published online: 01 Dec 2015

Abstract

In passive-source monitoring, an accurate velocity model is important to precisely estimate microseismic source locations, and to understand changes in reservoir properties. In this study, we employ frequency-domain full waveform inversion in order to obtain a high-resolution velocity model by exploiting full wavefields. We demonstrate the feasibility of the method for a surface geophone array by inverting for time-lapse 4D velocity changes in a realistic subsurface model. Our method successfully estimates the small velocity changes of a few percent within layers of 10s of meters, even for a single passive seismic source event. The analysis of wavepaths and gradients suggests that keys for the successful inversion are the use of full wavefields (both first and scattered arrivals), the vicinity of velocity changes to the source, and the wide-aperture surface array.

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References

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/content/journals/10.1071/ASEG2015ab155

Article Type: Research Article

Keyword(s): full waveform inversion; monitoring; passive seismic; velocity estimation

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oa Velocity model estimation by full waveform inversion of time-lapse 4D passive seismic array data

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