WAVELET BASED VOLUME ATTRIBUTES FOR SEISMIC INTERPRETATION

Seismic attribute analysis has gone through a major revolution due to the introduction of three-dimensional seismic imagery. Features of special interest are the local geometry of the seismic signal and its frequency content. We have developed a new kind of wavelet transform that has the ability to both separate approxi-mately the angular information and the polar scale, with only a limited increase in the amount of data. The directionality of this novel transform is obtained by projection of the wavelet coefficients onto positive and negative frequencies separately. The transformed data results in a complex wavelet transformation with a quasi-quadrature relationship between its real and imaginary parts and with superior directional selectiv-ity. We use this transform for the determination of local orientations of three-dimensional reflectors and for extraction of the local scale in migrated seismic data from the F09 block in the North Sea