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Abstract

In this section, various examples of sequence stratigraphy will be presented. The seismic character is employed to assist in determination of deposition environment, whether high- or lowstand, coupled with interpreted regional geology. In analysis of any area, the initial step is to obtain a recognized chronostratigraphy, a stratigraphy containing “absolute” dates.

An understanding of global, regional, and local geologic history is essential to produce a chronostratigraphy applicable to the area where the seismic record was collected. Existent global and regional geologic models are correct enough to dictate/influence the evolving local model used to interpret specific data. The geologic model or stratigraphy is a compilation of known tectonic, sealevel, and climate changes, and erosion and deposition characteristics. This “synthetic” stratigraphy is then converted into a geologically reasonable lithologic column and then translated into acoustic impedance and a synthetic seismogram. Comparison of the synthetic and field seismograms evaluates the geologic model.

If the two match, then the supposition is made that inputs (acoustic impedances derived from inferred lithologies) into the synthetic model also match the natural inputs (acoustic impedance derived from the natural geologic section effecting the acquisition of the original seismic data). While it is remotely possible that differing velocities and densities may produce acoustic impedances that coincide with those of the natural world, resulting in identity between synthetic and original seismic records, such an occurrence is not realistically very probable.

The purpose of this detailed seismic interpretation is to (1) identify and describe each reflection, (2) attribute its origin to

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