William C Ross1
(1) A2D Technologies, Lakewood, CO
ABSTRACT: High Resolution Sequence Stratigraphy on a Geologic Workstation
High Resolution Sequence Stratigraphy on a Geologic Workstation: Hunting for Sub-Seismic Resolution Features in Mature Basins
William C. Ross, Vice President, A2D Technologies/Interpretive Imaging
405 Urban Street, Lakewood, Colorado 80228
Well-log correlation work, and sequence stratigraphic methodology are enhanced through the use of computer workstations capable of working with large number of well logs. By harnessing the power of well-designed software, and inexpensive raster well-log images, geologists have the ability to correlate very detailed regional correlation frameworks established on the basis of log character.
Examples of high-resolution sequence stratigraphy are offered from the Almond, Lewis and Fox Hills Formations of the Eastern Green River Basin, where hundred of well logs were correlated with as many as 50 correlations per five-hundred foot interval. The results delineate subtle unconformities, and basin-fill geometries which are used to explain the depositional setting of a productive reservoir.
Techniques for overcoming computer screen-size limitations and for simulating paper-based log correlation techniques on a geologic workstation are illustrated in a live software demonstration. While much of what is possible on the computer workstation is possible using paper well logs, the sheer volume of well logs and the inefficiencies of paper-based methodologies prohibit stratigraphic studies of this detail for most workers.
By leveraging the power of the computer, low-cost raster images and the established methodologies of sequence stratigraphy, the industry has an opportunity to revisit mature basins to explore for "sub-seismic "resolution geologic features. Such features may be the basis for a new wave of discoveries in old basins.
AAPG Search and Discovery Article #90906©2001 AAPG Annual Convention, Denver, Colorado