Angus, DAC, Aljaafari, A, Usher, P et al. (1 more author) (2014) Seismic waveforms and velocity model heterogeneity: towards full-waveform microseismic location algorithm. Journal of Applied Geophysics, 111. 228 - 233. ISSN 0926-9851
Abstract
Seismic forward modeling is an integral component of microseismic location algorithms, yet there is generally no one correct approach, but rather a range of acceptable approaches that can be used. Since seismic signals are band limited, the length scale of heterogeneities can significantly influence the seismic wavefronts and waveforms. This can be especially important for borehole microseismic monitoring, where subsurface heterogeneity can be strong and/or vary on length scales equivalent to or less than the dominant source wavelength. In this paper, we show that ray-based approaches are not ubiquitously suitable for all borehole microseismic applications. For unconventional reservoir settings, ray-based algorithms may not be suitably accurate for advanced microseismic imaging. Here we focus on exploring the feasibility of using one-way wave equations as forward propagators for full waveform event location techniques. As a feasibility study, we implement an acoustic wide-angle wave equation and use a velocity model interpolation approach to explore the computational efficiency and accuracy of the solution. We compare the results with an exact solution to evaluate travel-time and amplitude errors. The results show that accurate travel-times can be predicted to within 2 ms of the true solution for modest velocity model interpolation. However, for accurate amplitude prediction or for higher dominant source frequencies, a larger number of velocity model interpolations is required.
Metadata
Item Type: | Article |
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Authors/Creators: |
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Copyright, Publisher and Additional Information: | © 2014 Elsevier B.V. NOTICE: this is the author’s version of a work that was accepted for publication in Journal of Applied Geophysics. Changes resulting from the publishing process, such as peer review, editing, corrections, structural formatting, and other quality control mechanisms may not be reflected in this document. Changes may have been made to this work since it was submitted for publication. A definitive version was subsequently published in Journal of Applied Geophysics, 111, (2014) DOI 10.1016/j.jappgeo.2014.10.013 |
Keywords: | Full waveform; Location error; Microseismic; Ray theory |
Dates: |
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Institution: | The University of Leeds |
Academic Units: | The University of Leeds > Faculty of Environment (Leeds) > School of Earth and Environment (Leeds) |
Depositing User: | Symplectic Publications |
Date Deposited: | 20 Nov 2014 12:05 |
Last Modified: | 19 Jan 2018 05:14 |
Published Version: | http://dx.doi.org/10.1016/j.jappgeo.2014.10.013 |
Status: | Published |
Publisher: | Elsevier |
Identification Number: | 10.1016/j.jappgeo.2014.10.013 |
Open Archives Initiative ID (OAI ID): | oai:eprints.whiterose.ac.uk:81224 |