Many times, the frequency content of the input seismic data is not good enough to meet the objectives that are set for a survey
In such cases, during or post-processing, some method for spectral balancing or frequency enhancement could be used, that could lead to higher vertical and lateral resolution.
An amplitude-friendly spectral balancing method would be preferred if some reservoir attributes are to
where ɛ is the
The figure below shows vertical slices through a seismic-amplitude volume before and after spectral balancing. The spectra were computed at intervals of 5 Hz ranging from 5 to 120 Hz. The balancing was computed using a value of ɛ = 0.04. The individual amplitude spectra before and after are shown as insets. Notice that after spectral balancing, the seismic section shows higher frequency content, and the amplitude spectrum is flattened.
A vertical line through a seismic amplitude volume (a) before, and (b) after spectral balancing. Note the small channel (yellow circle) and clear edge (green circle) and improved vertical resolution (cyan ellipse). (Data courtesy: TGS, Calgary)
Time slices at 1322 ms through coherence computed from seismic data (a) before and (b) after spectral balancing, and from the (c) 65 Hz, (d) 75 Hz, and (e) 85 Hz voice components. Coherence computed from the 65, 75, and 85 Hz components clearly shows the lineaments corresponding to the faults and fractures. (Data courtesy: TGS, Calgary)
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