Distributed Fiber-Optic Sensing for Local Ground-Roll Estimation and Attenuation
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Date
2022
Publication Type
Conference Paper
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yes
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Abstract
Distributed acoustic sensing usually aims at collecting spatially unaliased inline strain over tens of kilometers with a single optical fiber cable and associated interrogator. Here we explore the possibility of using this cost-effective technology to capture noise models and subsequently attenuate ground-roll originating from any directions (therefore including scattered noise) without relying on the traditional requirement of dense spatial sampling of geophones. We discuss a fiber cable layout composed of horizontal rings around the vertical geophones to measure the pseudo-pressure fluctuations, or equivalently the omni-directional divergence of the wavefield. Synthetic and field data confirm that loop circumference fluctuations are mainly generated by the Rayleigh wave train, in contrast to reflection signal. In addition, the proposed sensing approach seems more robust than finite-differencing additional horizontal geophone recordings. This suggests that a single additional component (complementary divergence via the interrogation of multiple fiber-optic rings) will allow sparser acquisition with reduced field effort and associated costs. Copyright © 2022 by the European Association of Geoscientists & Engineers (EAGE). All rights reserved
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published
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Book title
83rd EAGE Annual Conference & Exhibition 2022
Journal / series
Volume
1
Pages / Article No.
557 - 561
Publisher
Curran
Event
83rd EAGE Annual Conference & Exhibition
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03953 - Robertsson, Johan / Robertsson, Johan