Determination of Shear Wave Velocities in "Slow" Formations
Name
1983.2 Cheng and Toksoz.pdf
Size
458.54 KB
Format
Adobe PDF
Checksum (MD5)
22d5cd62ee212a949b91c280cf3010f9
Author(s)
Cheng, C. H.
Toksoz, M. Nafi
Date Issued
1983
Publisher
Massachusetts Institute of Technology. Earth Resources Laboratory
Series/Report no.
Earth Resources Laboratory Industry Consortia Annual Report;1983-02
Abstract
Direct determination of formation shear wave travel time is impossible in "slow" formations where the shear wave velocity is lower than the borehole fluid (mud) velocity. However, the Stoneley waves in these formations are very sensitive to changes in formation shear wave properties and can be used to indirectly determine the formation shear velocity, In addition, the P wave packet is highly dependent on the Poisson's ratio and thus can be used to estimate the shear velocity once the P wave velocity is known. These phenomena are demonstrated with both numerical and field examples.
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