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Permanent link (DOI): https://doi.org/10.7939/R38G9K

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Wellbore seismic and core sample measurement analysis: integrated geophysical study of the Lake Bosumtwi impact structure, Ghana Open Access

Descriptions

Other title
Subject/Keyword
Bosumtwi
rock physics
impactites
rock damage
vertical seismic profile
porosity
impact crater
microcracks
Type of item
Thesis
Degree grantor
University of Alberta
Author or creator
Meillieux, Damien Yves Justin
Supervisor and department
Schmitt, Douglas (Physics)
Examining committee member and department
Pinfold, James (Physics)
Herd, Christopher (Earth and Atmospheric Sciences)
Sacchi, Mauricio (Physics)
Department
Department of Physics
Specialization

Date accepted
2009-06-09T20:26:41Z
Graduation date
2009-11
Degree
Master of Science
Degree level
Master's
Abstract
Wellbore seismic measurements were recorded in the Lake Bosumtwi impact structure, Ghana, in 2004. A full range of petrophysical measurements were also performed in the laboratory on core samples from the same boreholes. The Vertical Seismic Profile shows low velocities for both P and S waves in the hardrock basement of the crater. Although we were expected to locate fractures within the rock, no upgoing waves were detected. Density and porosity measurements on the core samples indicate higher than normal porosity in the impact damaged rocks. Mercury porosimetry and SEM analysis characterized the pores as impact induced microcracks. These microcracks are most likely the reason for the low velocities observed on the seismic profiles, the in situ sonic logs, and the seismic velocity measurements on the core samples. Furthermore our laboratory P and S velocities measurements indicate a strong heterogeneity within the impactites.
Language
English
DOI
doi:10.7939/R38G9K
Rights
License granted by Damien Meillieux (damien.pyr@gmail.com) on 2009-06-05T17:04:19Z (GMT): Permission is hereby granted to the University of Alberta Libraries to reproduce single copies of this thesis and to lend or sell such copies for private, scholarly or scientific research purposes only. Where the thesis is converted to, or otherwise made available in digital form, the University of Alberta will advise potential users of the thesis of the above terms. The author reserves all other publication and other rights in association with the copyright in the thesis, and except as herein provided, neither the thesis nor any substantial portion thereof may be printed or otherwise reproduced in any material form whatsoever without the author's prior written permission.
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File format: pdf (Portable Document Format)
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File size: 3096655
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Filename: Meillieux_Damien_Fall_2009.pdf
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File title: Shock waves generated by impacts are supersonic and non-elastic waves, while seismic waves that are used in geophysics are elastic with a sonic or subsonic velocity. Elastic means that the changes introduced into the medium the wave propagates thr...
File title: Bosumtwi VSP and petrophysical integrated study
File author: Damien Meillieux
Page count: 87
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