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Frequency-domain Waveform Inversion Based on the Angle-domain Filtered Gradient
- Publisher: European Association of Geoscientists & Engineers
- Source: Conference Proceedings, 77th EAGE Conference and Exhibition 2015, Jun 2015, Volume 2015, p.1 - 5
Abstract
Summary
Correlating the source and receiver wavefields, which are travelling in a similar direction, isolates the long wavelength features of the gradient. This selective correlation is effectively achieved using the angle-domain imaging condition. We propose a frequency-domain waveform inversion algorithm based on the angle-domain filtered gradient. Since a large reflection angle in the imaging condition implies that the source and receiver wavefiels are travelling in a similar direction, the filtered gradient based on the large cut-off angle has a long wavelength component. As the cut-off angle is decreased, the proposed inversion method moves from the tomographic type inversion to the classic waveform inversion. Numerical examples show that the waveform inversion based on the angle-domain filtered gradient generates a long wavelength structure without low frequency information.
© EAGE Publications BV