Tuesday, March 24, 2015

Seismic Reflection Amplitude

Amplitude is the height of a seismic reflection peak (or trough) and is dependent on the reflection coefficient, but this direct relationship may be lost during processing. Frequently, amplitudes on seismic sections are balanced during processing to produce what is thought to be more easiliy interpretable sections. Usually, however, this makes it difficult and in many instances no longor possible to determine the relative strenghts of reflection coefficients. However, where amplitudes can be differentiated, the quantifying terms of high, medium, and low are used. Vertical changes in amplitude can be used to locate unconformities, whereas lateral changes can be used to help distinguish seismic facies. Great cautions must be exercised, however, as itnerference patterns from tuning, multiples, etc. , are responsible for many amplitude changes observed in seismic sections.

Reference : Practical Seismic Interpretation, Michael E. Badley.

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