Amplitude Simulation Technique for Seismic Amplitude Scaling | 16777
International Research Journals

International Research Journal of Geology and Mining

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Amplitude Simulation Technique for Seismic Amplitude Scaling


Oppong I. A. and Danour S. K.

Conventional amplitude compensation methods in seismic data processing tend to equalize or flatten seismic amplitudes. They tend to destroy the subsurface characters in the seismic data. They also decrease signal resolution and quality, and therefore result into false interpretation of geological structures. In this paper, we report on amplitude compensation methods using Amplitude Simulation Technique (AST). The technique is based on the Principle of Amplitude Modulation. This Principle requires that the ratio of the change in amplitude of a signal at the receiver position, to the amplitude at the source location, cannot exceed unity. On the basis of this, if a seismic signal has amplitude modulation in excess of unity, the processed seismic signal will produce severe amplitude distortions and interference. On the other hand, if the amplitude modulation is far less than unity, the processed seismic signal will have poor contrast, and therefore would need further amplitude compensation to improve signal to noise ratio. The absolute amplitude of the edited seismic signal was computed and a scatter diagram of the amplitude variation with the reflection time was displayed. The amplitudes of the farther samples were matched with the first maximum amplitude. The process was iterated, till all the samples achieved the same amplitude. Using a generated equation from Parseval’s Theorem, the percentage energy (amplitude) and power recovery of the new scaling functions were computed, and the results were displayed in order to choose the optimum scaling function (OSF) at a yielding point, for the seismic signal to preserve the signal signatures.

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