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An Inverse-Scattering Sub-Series For Predicting The Correct Spatial Location Of Reflectors: Initial Analysis, Testing And Evaluation
- Publisher: European Association of Geoscientists & Engineers
- Source: Conference Proceedings, 7th International Congress of the Brazilian Geophysical Society, Oct 2001, cp-217-00459
Abstract
The inverse scattering series inverts for medium properties from only the measured wavefield and information about a chosen reference medium. Motivated by the need to successfully image targets beneath complex overburdens, there is new research into the potential of this series to perform the specific inversion task of seismic depth migration without requiring a priori information about the Earth’s properties. A sub-series of the inverse scattering series has been identified that is responsible for locating seismic events in depth with reflection data. To evaluate the efficacy of this sub-series for imaging, it is systematically exposed to varying degrees of realism, under controlled conditions. This paper summarizes an initial analysis of the behavior of the imaging algorithm in 1-D when the contrast between actual and reference media is varied, and when truncating frequency and time apertures. As predicted analytically, it is found that the performance improves when the contrast is reduced and when the maximum frequency is lower. Finally, it is demonstrated that the algorithm remains effective even when missing zero frequency.