Characterization of polarization attributes of seismic waves using continuous wavelet transforms (original) (raw)

Multiwavelet spectral and polarization analyses of seismic records

Geophysical Journal International, 1995

Accepted 1995 March 23. Received 1995 March 13; in original form 1994 August 14 ... SUMMARY We present an algorithm, based on the wavelet transform and multiple taper spectral analysis, for providing a low-variance spectrum estimate of a non-stationary data process. ...

A processing technique for three component seismic data: use of polarisation characteristics

Exploration Geophysics, 1988

This paper presents a method that uses polarisation characteristics of three component seismic data (recorded by surface reflection profiling, VSP etc.) for discrimination and filtering of waves. Discrimination of waves in single (e.g., vertical) component data is based on frequency characteristics and apparent velocities, obtained from line-up observations. When three component records are used, discrimination based on polarisation characteristics is also possible. In this paper, we first describe the method by which polarisation characteristics are determined from three component records, and how these characteristics are used in polarisation filtering. Polarisation characteristics are estimated by eigenvector analysis of covariance matrices, which are obtained from three component data. The parameters thus obtained are then used in polarisation filtering. Following this is a discussion of the method. In this discussion, three component data, synthesized from waves having various ...

Complex seismic trace analysis and its application to time- lapse seismic surveys

2000

Complex trace analysis effects a natural separation of amplitude from angle (frequency and phase) and then allows definition of instantaneous attributes. The instantaneous amplitude defines single lobes for individual wavelets and, along with the instantaneous phase and frequency, has more power to resolve reflectors. In the case of strongly overlapping wavelets, the instantaneous amplitude and frequency have characteristics that help identify and distinguish wavelet interference. The instantaneous frequency, a measure of most energy-loaded or center frequency, traces frequency change with time. In time-lapse seismic surveys, the power of resolution improves event picks and calculation of time shift and amplitude variation, and the representation of frequency and phase facilitates the study of non-stationary processes.