Can full waveform refraction imaging overcome the century-long impasse at the first breaks?

Derecke Palmer

doi:10.1080/22020586.2019.12072942

2nd Australasian Exploration Geoscience Conference: Data to Discovery

ISSN: 2202-0586
E-ISSN:

oa Can full waveform refraction imaging overcome the century-long impasse at the first breaks?
Authors Derecke Palmer^a
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^a The University of New South Wales, Sydney, 2052, 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 - 4
DOI: https://doi.org/10.1080/22020586.2019.12072942
- Published online: 01 Dec 2019

Abstract

Summary

The signal-to-noise ratios (SNR) of the first arrivals are a function of the source-to-receiver distance and the head wave coefficient (HWC), the refraction analogue of the reflection coefficient. In turn, the precision of the first break traveltimes is a function of the SNR.

Stacking with the refraction convolution section (RCS) can significantly reduce the effects of geometrical spreading. However, the effects of the HWC still remain.

The time models of the base of the weathering computed with the common reciprocal method are comparable to those computed with the RCS. However, only the RCS is able to detect small thrusts within the Fresnel zone.

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2026-01-14

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References

Brown, A. R., 2011, Interpretation of three-dimensional seismic data; SEG Investigations in Geophysics, No. 9, 7th edition, Society of Exploration Geophysicists, Tulsa, 646p.
Cox, M. J. G., 1999, Static corrections for seismic reflection surveys. Society of Exploration Geophysicists, Tulsa.
Jones L.E.A. and Drummond B.J. 2001. Effect of smoothing radius on refraction statics corrections in hard rock terrains. 15th ASEG Conference and Exhibition, Brisbane (Extended Abstract).
Khalaf, A., Camerlynck, C., Florsch, N., and Schneider, A., 2018, Development of an adaptive multi-method algorithm for automatic picking of first arrival times: application to near surface seismic data. Near Surface Geophysics 16, 507-526.
Palmer, D, 2001, Imaging refractors with the convolution section, Geophysics 66, 1582-1589.
Palmer D. 2009. Integrating short and long wavelength time and amplitude statics. First Break 27(6), 57–65.
Palmer, D., 2013, Resolving complex structure in near-surface refraction seismology with common offset gathers: The Leading Edge, 32, 680-690.
Palmer, D., 2015a, Is accuracy more important than precision in near surface refraction seismology? Near Surface Geophysics, 13, 1-18.
Palmer, D., 2015b, Does diving wave tomography improve discovery in near surface refraction seismology? FastTIMES 20(3) 15-32.

/content/journals/10.1080/22020586.2019.12072942

Article Type: Research Article

Keyword(s): first breaks; precision; RCS; signal-to-noise

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