Improving Seismic-to-well Ties

Seismic-to-well ties are important for seismic interpretation and impedance inversion. Reflectivity can be calculated directly from well logs while its estimation from seismic data requires the determination of the seismic wavelet and the removal of the same. In the presence of anelastic attenuation, the constant-Q theory predicts that the seismic wavelet evolves with amplitude decay and minimum-phase dispersion. Stationary deconvolution estimates and eliminates a single wavelet from the nonstationary trace, resulting in large nonstationary amplitude and phase errors. Gabor deconvolution accurately estimates and eliminates the amplitude spectra of the propagating wavelets, but only corrects the phase to the seismic Nyquist frequency. A phase correction operator is developed to correct the phase to the well logging frequency. Both synthetic and real data examples show seismic-to-well ties can be improved by correcting their time shifts via smooth dynamic time warping and addressing slowly time-variant nonstationarity in a sliding Gaussian window.

Name thesis:degree_name

Master of Science (MSc)

Discipline thesis:degree_discipline

Geology and Geophysics

Grantor dc:publisher.institution

Graduate Studies

Year dc:date.issued

2015

Author dc:creator

• Cui, Tianci

Advisor dc:contributor.advisor

• Margrave, Gary

Committee members dc:contributor.committeemember

• Lines, Laurence
• Rios, Cristian

• Geophysics
• Mathematics
• Computer Science

Statement dc:rights

• University of Calgary graduate students retain copyright ownership and moral rights for their thesis. You may use this material in any way that is permitted by the Copyright Act or through licensing that has been assigned to the document. For uses that are not allowable under copyright legislation or licensing, you are required to seek permission.

Language dc:language.iso

eng

DOI

http://dx.doi.org/10.11575/PRISM/26495

OAI identifier oai:identifier

oai:ucalgary.scholaris.ca:11023/2664