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AAPG Bulletin, V.
The use of spectral recomposition in tailored forward seismic modeling of outcrop analogs
1Enhanced Oil Recovery Institute, University of Wyoming, 1000 E. University Ave., Department 4068, Laramie, Wyoming 82071; [email protected]
2Chevron Center for Research Excellence, Department of Geology and Geological Engineering, Colorado School of Mines, 1716 Illinois St., Golden, Colorado 80401
3Chevron Center for Research Excellence, Department of Geology and Geological Engineering, Colorado School of Mines, 1716 Illinois St., Golden, Colorado 80401
Spectral recomposition is an improved methodology for generating forward seismic models of outcrop analogs that make use of the full range of frequencies found within real-world seismic volumes. It overcomes the issue common to conventional forward seismic models in which single-peak frequencies are modeled, with the resultant models not capturing the range of frequency content that is found in the real world image. This variable frequency content of real-world seismic volumes has long been known to contain more detailed information within different spectral bands, which forms the basis of the spectral decomposition process, in which different spectral frequencies can correlate to different stratigraphic thicknesses, for example.
In this article, we introduce and illustrate the use of a new method termed spectral recomposition. Spectral recomposition is a poststack seismic method operating in the frequency domain that recomposes forward seismic models generated at separate peak frequencies to derive a final image, which has a frequency spectrum similar to that of a targeted real-world image. Using this method, forward seismic models can be tailored to specific real-world images and be used as a more appropriate comparison between the known outcrop geometries and those that are imaged in the subsurface.
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