Method for compensating seismic wavefield amplitudes for transmission losses in the overburden
AssigneeWestern Atlas International, Inc.
InventorsAlfonso Gonzalez, Ronald E. Chambers
Life of this patent
Estimating the term…
Abstract
The relative amplitudes of seismic reflection data contains very useful information about the subsurface earth formations. Surface and subsurface-consistent amplitude processing identifies and corrects for the variability introduced by instrumentation and surface distortions. Dynamic amplitude decomposition, the subject of this disclosure, identifies and compensates for reflection amplitude fading due to subsurface transmission absorption media.
Claims5
A method for processing seismic data, comprising:
- introducing a seismic wavefield into the earth at a source location;
- at a receiving location offset from said source location, receiving said wavefield after reflection from subsurface earth layers and formatting said received wavefield as a time scale recording of data samples;
- dividing said time scale recording into time windows of preselected width;
- estimating a transmission loss map from the data;
- and
- compensating for anomalous amplitude fading by applying a transmission-loss compensation operator to the data samples within each said time window;
- displaying the compensated seismic data.
A method for compensating for amplitude fading of reflected seismic wavefield data samples in the presence of acoustic absorption anomalies in the overburden, comprising:
- formatting said seismic wavefield data samples in time-sequential order;
- subdividing the ordered data samples into time windows having a predetermined length;
- estimating a transmission-loss map within each said time window from said seismic wavefield data;
- and
- applying a linear transmission-loss compensation operator to the sampled amplitude-levels of the data within each said time window;
- displaying the compensated seismic data.
Dependencies are inferred from the claim text.