Spectral Bandwidth Extension: Invention versus Harmonic Extrapolation

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dc.contributor.advisorCastagna, John P.
dc.contributor.committeeMemberChesnokov, Evgeni M.
dc.contributor.committeeMemberHilterman, Fred J.
dc.contributor.committeeMemberEbrom, Daniel A.
dc.creatorLiang, Chen 1989-
dc.date.accessioned2015-02-11T18:32:51Z
dc.date.available2015-02-11T18:32:51Z
dc.date.createdMay 2014
dc.date.issued2014-05
dc.date.updated2015-02-11T18:32:52Z
dc.description.abstractThere are valid and invalid post-processing methods to extend seismic bandwidth for resolution enhancement. Some methods attempt to invent high frequencies without a physical basis, while inversion-based methods extrapolate the spectra in reasonable ways. Frequency invention methods can extend the original seismic spectrum to desired spectral bandwidths. However, those spectral components they invent do not provide new effective information for enhancing resolution. Matching pursuit decomposition has been successfully applied to analyze the available spectrum of seismic data. Consequently, missing spectral components can be directly extrapolated from zero frequency all the way to the Nyquist frequency. Alternatively, the spectral information within the limited band can be modeled as an autoregressive process. Higher and lower frequencies outside the band can thus be predicted by designing a Wiener prediction filter. Spectral decomposition by matching pursuit on the band-limited seismic trace stabilizes the predictions to recover a broad-band reflectivity sequence. Further, continuous wavelet transform can be employed to spectrally decompose the band-limited signal into discrete sub-bands from which missing high and low frequencies could be extrapolated locally using multi-channel operators. Conventional sparse spike deconvolution attempts to retrieve a reflectivity sequence comprising isolated sparse delta functions, which may restore the missing part of the spectrum.
dc.description.departmentEarth and Atmospheric Sciences, Department of
dc.format.digitalOriginborn digital
dc.format.mimetypeapplication/pdf
dc.identifier.urihttp://hdl.handle.net/10657/898
dc.language.isoeng
dc.rightsThe author of this work is the copyright owner. UH Libraries and the Texas Digital Library have their permission to store and provide access to this work. Further transmission, reproduction, or presentation of this work is prohibited except with permission of the author(s).
dc.subjectFrequency modulating
dc.subjectFrequency sliding
dc.subjectFrequency doubling
dc.subjectMatching pursuit decomposition (MPD&FMPD)
dc.subjectAutoregressive model
dc.subjectWiener prediction
dc.subjectContinuous wavelet transform
dc.subjectMultichannel operator
dc.subjectL1-norm regularization
dc.subjectIteratively reweighting strategy
dc.subject.lcshGeophysics
dc.titleSpectral Bandwidth Extension: Invention versus Harmonic Extrapolation
dc.type.dcmiText
dc.type.genreThesis
thesis.degree.collegeCollege of Natural Sciences and Mathematics
thesis.degree.departmentEarth and Atmospheric Sciences, Department of
thesis.degree.disciplineGeophysics
thesis.degree.grantorUniversity of Houston
thesis.degree.levelMasters
thesis.degree.nameMaster of Science

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