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Compensation for Stratipraphic Absorption of Seismic Attenuation Based on the Improved Generalized S-transform
- Publisher: European Association of Geoscientists & Engineers
- Source: Conference Proceedings, 73rd EAGE Conference and Exhibition incorporating SPE EUROPEC 2011, May 2011, cp-238-00251
- ISBN: 978-90-73834-12-5
Abstract
In generalized S-transform, the window width of Gauss function changes inversely proportional to frequency. However, for improved generalized S-transform, the variable window width is proportional to frequency. That is, the window is narrower for low frequency with the high time resolution, while the window is wider for high frequency with the high frequency resolution. With the new method, the lossless inverse generalized S-transform can be conducted and the time-dependent Q value can be estimated. Therefore, the under-compensation and over-compensation presented in the traditional method were avoided. After the compensation, the frequency band and instantaneous dominant frequency are consistent with the time. Application of the new method in the field VSP data shows that the new method works very well for absorption/attenuation compensation and improves data quality.