作者: K. J. Ellefsen , M. N. Toksöz , K. M. Tubman , C. H. Cheng
DOI: 10.1190/1.1443210
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摘要: We have developed a method that estimates shear modulus (c66) of transversely isotropic formation using the tube wave generated during acoustic logging. (The symmetry axis anisotropy is assumed to parallel borehole.) The inversion, which implemented in frequency‐wavenumber domain, based upon cost function has three terms: measure misfit between observed and predicted wavenumbers wave, current estimate for c66 most‐likely value c66, penalty functions constrain physically acceptable values. largest contribution ordinarily comes from first term, indicating depends mostly on data. Because only one minimum, it can be found standard optimization methods. minimum well defined resolved. Estimates synthetic data are almost a...