IMAGING ELEMENTS OF DEPOSITIONAL SYSTEMS WITH 3-D SEISMIC DATA: A CASE STUDY
HENRY W. POSAMENTIER, GEOFFREY A. DORN, MARY J. COLE, CHARLES W. BEIERLE, STEVEN P. ROSS, 1996. "IMAGING ELEMENTS OF DEPOSITIONAL SYSTEMS WITH 3-D SEISMIC DATA: A CASE STUDY", Stratigraphic Analysis Utilizing Advanced Geophysical, Wireline and Borehole Technology for Petroleum Exploration and Production, Jory A. Pacht, Robert E. Sheriff, Bob F. Perkins
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Time slices and horizon slices have been utilized to extract stratigraphic information from a 3-D seismic data set in order to develop techniques for imaging elements of depositional systems. Many of the stratigraphic details that this work has yielded would have been virtually impossible to recognize on vertical seismic sections without knowing beforehand that these features were present. Some of these features include braided stream channels, tributary stream channels, channel scroll bars, incised valleys, deep-water leveed channels, deep-water incised channels, and glacial features such as kames and kettles.
To illustrate the type of stratigraphic information potentially present within 3-D seismic data volumes, an analysis of a 3-D seismic survey from an offshore shelf location is presented. The analysis involved slicing through the data volume using a variety of procedures including planar-horizontal time slices, inclined planar slices, and horizon-parallel slices. The elements of various depositional environments observed (from bottom to top) include:
1) a low-sinuosity, deep-water incised channel approximately one kilometer wide,
2) a deep-water leveed channel system approximately 150 meters wide.
3) several slump scars interpreted to have formed in a slope setting,
4) a glacial outwash plain pitted with small kettles,
5) a widespread network of braided stream deposits,
6) several large (approximately one kilometer wide) smooth-walled glacial meltwater channels,
7) small tributary fluvial channels 100-200 meters wide, and
8) linear iceberg scour striations.
With the exception of the large smooth-walled glacial meltwater channels, none of these depositional system elements had been recognized prior to slicing through the data volume.