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Development and application of a high resolution 3D Chirp sub-bottom profiling system

Development and application of a high resolution 3D Chirp sub-bottom profiling system
Development and application of a high resolution 3D Chirp sub-bottom profiling system

Chirp sub-bottom profilers are widely used to collect high resolution 2D marine seismic data with high signal-to-noise ratio using repeatable source signatures.  This thesis describes the development of the first 3D Chirp system.

During the design of a high resolution 3D seismic system critical factors need to be considered including correct spatial sampling of the recorded data and the sufficiently accurate positioning of source and receiver elements.  Correct spatial sampling of the recorded data was assured by determining optimal source array and receiver group geometries by numerical modelling of reflection amplitudes using a model which includes frequency dependent directivities of the acquisition system components.  The system design incorporates 60 receiver groups with 25 cm spacing in both horizontal directions and four source transducers arranged into a Maltese cross geometry or as a double pair.  The source array and receiver groups are fixed on a 2.2 m x 2.5 m rigid structure that is surface towed from small survey vessels.  Real Time Kinematic GPS and a GPS-based attitude system are used to position the source arrays and receiver groups with centrimetre accuracy.  Additionally the development and testing of source signatures, operating on a bandwidth of 1.5 to 13 kHz and to be used with the system, are discussed.

The first 3D Chirp dataset was acquired in the West Solent (UK), covering an area of 75 m x 750 m.  It is processed, using newly developed geometry processing routines, to produce a fully sampled 3D data volume.  Visualisation and analysis of the seismic data volume reveal dipping structures, which are interpreted as sedimentary rocks of the Headon Hill formation of Eocene age.

University of Southampton
Gutowski, Martin
cd31d0d7-2bcc-4c54-8b33-610ce765d7e5
Gutowski, Martin
cd31d0d7-2bcc-4c54-8b33-610ce765d7e5

Gutowski, Martin (2004) Development and application of a high resolution 3D Chirp sub-bottom profiling system. University of Southampton, Doctoral Thesis.

Record type: Thesis (Doctoral)

Abstract

Chirp sub-bottom profilers are widely used to collect high resolution 2D marine seismic data with high signal-to-noise ratio using repeatable source signatures.  This thesis describes the development of the first 3D Chirp system.

During the design of a high resolution 3D seismic system critical factors need to be considered including correct spatial sampling of the recorded data and the sufficiently accurate positioning of source and receiver elements.  Correct spatial sampling of the recorded data was assured by determining optimal source array and receiver group geometries by numerical modelling of reflection amplitudes using a model which includes frequency dependent directivities of the acquisition system components.  The system design incorporates 60 receiver groups with 25 cm spacing in both horizontal directions and four source transducers arranged into a Maltese cross geometry or as a double pair.  The source array and receiver groups are fixed on a 2.2 m x 2.5 m rigid structure that is surface towed from small survey vessels.  Real Time Kinematic GPS and a GPS-based attitude system are used to position the source arrays and receiver groups with centrimetre accuracy.  Additionally the development and testing of source signatures, operating on a bandwidth of 1.5 to 13 kHz and to be used with the system, are discussed.

The first 3D Chirp dataset was acquired in the West Solent (UK), covering an area of 75 m x 750 m.  It is processed, using newly developed geometry processing routines, to produce a fully sampled 3D data volume.  Visualisation and analysis of the seismic data volume reveal dipping structures, which are interpreted as sedimentary rocks of the Headon Hill formation of Eocene age.

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Published date: 2004

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Local EPrints ID: 465457
URI: http://eprints.soton.ac.uk/id/eprint/465457
PURE UUID: 5557538b-bd2c-4f12-8a1c-452398b6e3a0

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Date deposited: 05 Jul 2022 01:09
Last modified: 16 Mar 2024 20:11

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Contributors

Author: Martin Gutowski

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