Deep-towed High Resolution multichannel seismic imaging

High Resolution (220–1050Hz) seismic acquisition performed in deep water using deep-towed systems provides unrivalled lateral resolution when compared to conventional surface seismic. The lateral resolution of these acquisitions is controlled by the width of the first Fresnel zone, taking advantage...

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Bibliographic Details
Published in:Deep-sea research. Part I, Oceanographic research papers Oceanographic research papers, 2014-11, Vol.93, p.83-90
Main Authors: Marsset, B., Menut, E., Ker, S., Thomas, Y., Regnault, J.-P., Leon, P., Martinossi, H., Artzner, L., Chenot, D., Dentrecolas, S., Spychalski, B., Mellier, G., Sultan, N.
Format: Article
Language:English
Subjects:
Acquisitions
Applied geophysics
Deep sea
Deep-towed seismics
Deformation
Digital imaging
Earth sciences
Earth, ocean, space
Exact sciences and technology
Fresnel zones
High resolution
Imaging
Internal geophysics
Life Sciences
Marine geology
Marketing
Multichannel
Multichannel streamer
Rolling motion
Sciences of the Universe
Seismic imaging
Seismology
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Summary:High Resolution (220–1050Hz) seismic acquisition performed in deep water using deep-towed systems provides unrivalled lateral resolution when compared to conventional surface seismic. The lateral resolution of these acquisitions is controlled by the width of the first Fresnel zone, taking advantage of their positions close to the sea bottom. No current existing deep towed equipment can benefit from seismic imaging processing techniques to improve this resolution as a consequence of positioning inaccuracies. The technological developments of a digital deep-towed multichannel streamer are presented with a particular attention to positioning: each hydrophone incorporates a pitch, roll and heading sensor in order to monitor the constant deformation of the streamer in operation. The sea trials took place in July 2013 in the Mediterranean Sea. Pre-stack depth migration applied to the deep-towed multichannel data illustrates the potential of this emerging methodology in terms of penetration (12dB improvement in Signal/Noise) and lateral resolution (mean signal wavelength: 3m) when compared with deep-towed single-channel acquisition. •Perform deep towed High Resolution multichannel seismic imaging.•Design of pressure-resistant digital hydrophones.•Monitor the streamer deformation with pitch, roll, and heading sensors.
ISSN:0967-0637
1879-0119
DOI:10.1016/j.dsr.2014.07.013