Electronic Resource
Oxford, UK
:
Blackwell Publishing Ltd
Geophysical journal international
107 (1991), S. 0
ISSN:
1365-246X
Source:
Blackwell Publishing Journal Backfiles 1879-2005
Topics:
Geosciences
Notes:
Four offset marine Vertical Seismic Profiles (VSPs) are analysed for shear-wave splitting in a southern North Sea gas reservoir using mode-converted shear waves. Automatic estimates of fast shear-wave polarizations and time delays indicate the presence of stress-induced cracks striking at between N35°W and N60°W, corresponding to independent measurements of stress from borehole breakout data and earthquake studies. Time delays suggest that shear-wave splitting occurs only in the overlying sealing rock with no measurable anisotropy in the reservoir sands. All measurements are contaminated by scattered energy, probably resulting from non-planar interfaces and/or lateral variations in lithology. More reliable results may have been obtained if the VSP offsets were not almost parallel and perpendicular to the maximum horizontal stress direction.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1111/j.1365-246X.1991.tb01407.x
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