ABSTRACT

Using the hierarchical discriminatory powers of spectral analysis of seismic reflection data by viewing different frequency bands, it is possible to derive sequences of different orders (1st, 2nd, 3rd, 4th) much as does classical sequence stratigraphy using the geometry of reflectors. Spectral analysis may determine fining-up or down, an integral component of the geologic interpretation of any sequence. Abrupt offsets of reflectors of same frequency and character indicate faults. Such fault determinations can occur in zones of chaotic and discontinuous reflections. Spectral continuity of a given reflector permits quantitative interpretation of tectonic motions.

This proprietary Structural and Formational (SFI) technique uses stratal information available, including depositional models. Specific seismic facies may be interpreted from reflector geometries that are part of the data processing package. SFI techniques, developed in Moscow, Russia, have been applied to a dip section in Winn County, northern Louisiana. Traditional tectonic interpretations have been of normal, down-to-the-basin/south-dipping faults. Trend analysis at various frequencies indicate numerous counter-regional faults with thrust components at depths between one and three seconds.

Seismic data with finer resolution indicates mound configurations near the basal Hosston, channel-like/concave-upward features in the Hosston, lend-shaped bodies (possibly slump blocks) in the Midway, and prograding wedges with possible carbonate buildups in the Mouringsport, providing additional seismic facies data not obtained from classical sequence stratigraphy.

SFI, with its dependence on digital data processing, frequency-based analysis, and seismic unit determination, is an excellent compliment to visually-based, geometry-oriented sequence stratigraphy.