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Estimating The Elastic Moduli Of Transversely Isotropic Formations

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dc.contributor.author Ellefsen, K. J.
dc.contributor.author Cheng, C. H.
dc.contributor.other Massachusetts Institute of Technology. Earth Resources Laboratory en_US
dc.date.accessioned 2012-11-29T21:17:16Z
dc.date.available 2012-11-29T21:17:16Z
dc.date.issued 1989
dc.identifier.uri http://hdl.handle.net/1721.1/75118
dc.description.abstract Using acoustic logging data, we develop a method of estimating the horizontal shear modulus C[subscript 66]) of a transversely isotropic formation with its axis of symmetry parallel to that of the borehole. The data for the inversion are the wavenumbers, at every frequency, of the guided waves. The inversion minimizes the difference between these observed wavenumbers and those calculated by a forward model. The final estimates of the elastic moduli are constrained by the a priori estimates of their values and by the requirement to keep the stiffness tensor positive definite. The inversion produced similar results when it was applied to synthetic data from hard and soft formations. The estimate for the shear modulus, C[subscript 66], was fairly accurate because this parameter is moderately well resolved. The estimates for C[subscript ll] and C[subscript 13] are inaccurate because they are poorly resolved by the data. Tight constraints on the fluid modulus prevent this parameter from changing. much. The inversion did not attempt to estimate either C[subscript 33] or C[subscript 44] because they can be determined from the refracted P - and S-waves or the flexural wave. en_US
dc.description.sponsorship Massachusetts Institute of Technology. Full Waveform Acoustic Logging Consortium en_US
dc.description.sponsorship Phillips Petroleum Fellowship en_US
dc.publisher Massachusetts Institute of Technology. Earth Resources Laboratory en_US
dc.relation.ispartofseries Earth Resources Laboratory Industry Consortia Annual Report;1989-06
dc.title Estimating The Elastic Moduli Of Transversely Isotropic Formations en_US
dc.type Technical Report en_US
dc.contributor.mitauthor Ellefsen, K. J.
dc.contributor.mitauthor Cheng, C. H.
dspace.orderedauthors Ellefsen, K. J.; Cheng, C. H. en_US


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