Characteristics of high-resolution marine reflection profiling sources

Verbeek, N.H.; McGee, Thomas M.

doi:10.1016/0926-9851(95)90045-4

Cited by 34 publications

(19 citation statements)

References 3 publications

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“…Shallow seismics can also be done by other sources such as sonar, boomer, plasmagun, sparker and watergun (Verbeek and McGee, 1995). It remains to se in exactly which application the LACS has its greatest potential.…”

Section: Discussionmentioning

confidence: 99%

A seismic field test with a Low-level Acoustic Combustion Source and Pseudo-Noise codes

Askeland

Ruud

Hobæk

et al. 2009

Journal of Applied Geophysics

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The Low level Acoustic Combustion Source (LACS) is a new type of pulsed underwater acoustic source with an output level of 0.5-1.0 barm peak to peak. The source is based on a combustion engine and intended for shallow seismic surveys. It operates at 5 m depth and is able to fire pulses at a rate of up to 11 shots per second. Because of the source's low output level, it is expected to be more suitable than other sources in environmental sensitive areas. The low pulse level may be compensated for by an integration of energy from a sequence of pulses. This article describes the results of a seismic field test in Byfjorden outside Bergen, Norway. The best seismic result is achieved using deconvolution or an iterative correlation method where the correlator sequence is recorded right below the seismic source. Compared with airgun results along the same survey path, the seismic picture based on the LACS source gives a clearer presentation of the bottom layers.

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Section: Discussionmentioning

confidence: 99%

A seismic field test with a Low-level Acoustic Combustion Source and Pseudo-Noise codes

Askeland

Ruud

Hobæk

et al. 2009

Journal of Applied Geophysics

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“…The seismic source is an electro-acoustic Boomer plate, capable of producing a high-frequency, wide-band and highly repeatable minimum phase pulse (Verbeek & McGee, 1995) (Fig. 1); the receiver streamer has 60 channels with minimum offset equal to 10 meters, one-meter group spacing and 7 elements per group.…”

Section: Setting and Data Overviewmentioning

confidence: 99%

“…1); the receiver streamer has 60 channels with minimum offset equal to 10 meters, one-meter group spacing and 7 elements per group. Both source and receiver directivity filters have been applied to the synthetics in the FK domain prior to the misfit computation (Verbeek & McGee, 1995;Riedel & Theilen, 2001). The inversion is performed on the reference-trace deconvolved seismograms, which is expected to be robust against inaccuracies in the wavelet estimate.…”

Section: Setting and Data Overviewmentioning

confidence: 99%

Pre-stack full waveform inversion of ultra-high-frequency marine seismic reflection data

Provenzano

Vardy

Henstock

2017

Geophysical Journal International

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SUMMARYThe full waveform inversion (FWI) of seismic reflection data aims to reconstruct a detailed physical properties model of the subsurface, fitting both the amplitude and traveltime of the reflections generated at physical discontinuities in the propagation medium. Unlike reservoirscale seismic exploration, where seismic inversion is a widely adopted remote characterisation tool, ultra high frequency (UHF, 0.2-4.0 kHz) multi-channel marine reflection seismology is still most often limited to a qualitative interpretation of the reflections' architecture. Here we propose an elastic full waveform inversion methodology, custom-tailored for pre-stack UHF marine data in vertically heterogeneous media to obtain a decimetric-scale distribution of Pimpedance, density and Poisson's ratio within the shallow sub-seabed sediments. We address the deterministic multi-parameter inversion in a sequential fashion. The complex trace instantaneous phase is first inverted for the P-wave velocity to make-up for the lack of low-frequency in the data and reduce the non-linearity of the problem. This is followed by a short-offset Pimpedance optimisation and a further step of full offset range Poisson's ratio inversion. Provided that the seismogram contains wide reflection angles (> 40 degrees), we show that it is possible to invert for density and decompose a-posteriori the relative contribution of P-wave velocity and density to the P-impedance. A broad range of synthetic tests is used to prove the potential of the methodology and highlights sensitivity issues specific to UHF seismic. An example application to real data is also presented. In the real case, trace normalisation is applied to minimise the systematic error deriving from an inaccurate source wavelet estimation. G. Provenzano et al.The inverted model for the top 15 meters of the sub-seabed agrees with the local lithological information and core-log data. Thus we can obtain a detailed remote characterisation of the shallow sediments using a multi-channel sub-bottom profiler within a reasonable computing cost and with minimal pre-processing. This has the potential to reduce the need of extensive geotechnical coring campaigns.

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“…Single channel, high resolution records of seismic and sidescan data have been collected by the GSC for over 50 years (Verbeek and McGee 1995;McRea, Jr., et al 1999;Mosher and Simpkin 1999;Parkinson 2002). The seismic records acoustically image the Earth structure of the upper few kilometres below the seabed with varying degrees of resolution, ranging from high frequency (>1 kHz) examples of the uppermost few metres of the sediment column, to lower frequency (50-200 Hz), lower resolution images of the deeper structure.…”

Section: Analog Seismic and Sidescan Data Collectionmentioning

confidence: 99%

Canada GEESE 2: Visualization of Integrated Marine Geoscience Data for Canadian and Proximal Waters

Courtney

2013

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The Geological Survey of Canada has made most of its holdings of marine geoscience data available online with unrestricted access. These holdings constitute the premier collections of geological and geophysical source data for Canadian and proximal waters. Multibeam bathymetric imagery, analog high resolution seismic and sidescan sonar data, seabed photographs, grain size analyses, and radiocarbon dates can be directly downloaded from NRCan’s Geogratis (http://geogratis.cgdi.gc.ca) servers. KML files allow the user to discover and explore these collections, highlighting the building blocks of marine data downloadable from ftp/http servers.SOMMAIRELa Commission géologique du Canada a mis en ligne la plupart de ses fonds de données géoscientifiques marines et y donne accès sans restriction. Ces fonds constituent des collections de premier choix de données géologiques et géophysiques de base des eaux canadiennes ou proximales. On peut ainsi télécharger des serveurs Géogratis de RNCan (http://geogratis.cgdi.gc.ca) des données d’imagerie bathymétrique par secteurs, des données analogiques séismiques haute résolution et de levé de sonar à balayage latéral, des photographies du fond marin, des analyses granulométriques, et des datations au radiocarbone. Le format KML des fichiers permet aux utilisateurs d’exploiter facilement le contenu de ces collections, en mettant en relief les données marines de base téléchargeables depuis les serveurs FTP/HTTP.

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Characteristics of high-resolution marine reflection profiling sources

Cited by 34 publications

References 3 publications

A seismic field test with a Low-level Acoustic Combustion Source and Pseudo-Noise codes

A seismic field test with a Low-level Acoustic Combustion Source and Pseudo-Noise codes

Pre-stack full waveform inversion of ultra-high-frequency marine seismic reflection data

Canada GEESE 2: Visualization of Integrated Marine Geoscience Data for Canadian and Proximal Waters

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