dc.contributor.author | Block, Lisa V. | |
dc.contributor.author | Cheng, C. H. | |
dc.contributor.author | Duckworth, Gregory L. | |
dc.contributor.other | Massachusetts Institute of Technology. Earth Resources Laboratory | en_US |
dc.date.accessioned | 2019-04-04T10:09:42Z | |
dc.date.available | 2019-04-04T10:09:42Z | |
dc.date.issued | 1986 | |
dc.identifier.uri | https://mit.atmire.com/handle/1721.1/121146 | |
dc.description.abstract | Average semblance and maximum-likelihood spectral analysis are applied to synthetic
full waveform acoustic logging data to determine formation velocities. Of particular
interest is the ability of these methods to resolve the P wave and pseudo-Rayleigh wave
arrivals in data from poorly-bonded cased boreholes. In open-hole data the velocity
analyses generally yield results within 0.15 km/s of the true velocities. For cased-hole
models with no steel/cement bonding (free pipe), the measured P-wave velocities are
0.2 to 0.6 km/s less than the actual formation velocities, and the S-wave velocities are
within 0.15 km/s of the true velocities. If the P-wave velocity is fairly close to the
plate velocity of the steel pipe (within 0.7 km/s or so), then the P-wave arrival is not
separated from the steel arrival by the semblance method, but the P wave is resolved
by the spectral analysis. For cased-hole models with no cement/formation bonding
(unbonded casing), accurate formation velocities are obtained if the velocities are not
too great. When the formation P-wave velocity approaches the velocity of the casing
arrival, the P-wave resolution is lost by both methods. Further work needs to be done
to better define this limit. | en_US |
dc.publisher | Massachusetts Institute of Technology. Earth Resources Laboratory | en_US |
dc.relation.ispartofseries | Earth Resources Laboratory Industry Consortia Annual Report;1986-04 | |
dc.title | Velocity Analysis Of Multi-Receiver Full Waveform Acoustic Logging Data In Open And Cased Holes | en_US |
dc.type | Technical Report | en_US |
dc.contributor.mitauthor | Block, Lisa V. | |
dc.contributor.mitauthor | Cheng, C. H. | |
dc.contributor.mitauthor | Duckworth, Gregory L. | |
dspace.orderedauthors | Block, Lisa V.; Cheng, C. H.; Duckworth, Gregory L. | en_US |