Show simple item record

dc.contributor.authorBlock, Lisa V.
dc.contributor.authorCheng, C. H.
dc.contributor.authorDuckworth, Gregory L.
dc.contributor.otherMassachusetts Institute of Technology. Earth Resources Laboratoryen_US
dc.date.accessioned2019-04-04T10:09:42Z
dc.date.available2019-04-04T10:09:42Z
dc.date.issued1986
dc.identifier.urihttps://mit.atmire.com/handle/1721.1/121146
dc.description.abstractAverage 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.publisherMassachusetts Institute of Technology. Earth Resources Laboratoryen_US
dc.relation.ispartofseriesEarth Resources Laboratory Industry Consortia Annual Report;1986-04
dc.titleVelocity Analysis Of Multi-Receiver Full Waveform Acoustic Logging Data In Open And Cased Holesen_US
dc.typeTechnical Reporten_US
dc.contributor.mitauthorBlock, Lisa V.
dc.contributor.mitauthorCheng, C. H.
dc.contributor.mitauthorDuckworth, Gregory L.
dspace.orderedauthorsBlock, Lisa V.; Cheng, C. H.; Duckworth, Gregory L.en_US


Files in this item

Thumbnail

This item appears in the following Collection(s)

Show simple item record