--> Abstract: Regional Stratigraphic Correlation Utilizing High-Density Digital Well-Log Displays, by Mark C. Robinson and Ralph Williams; #90078 (2008)
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Regional Stratigraphic Correlation Utilizing High-Density Previous HitDigitalNext Hit Well-Log Displays

Mark C. Robinson and Ralph Williams
Reservoir Visualization, Inc., Humble, TX

The utilization of geophysical well-logs for stratigraphic correlation has proven to be an valuable tool in the understanding of regional geologic depositional frameworks. Recent advances in computer and database techniques now allow for the accumulation and display of large numbers of Previous HitdigitalNext Hit well-logs. It is now possible to utilize the Previous HitdigitalNext Hit geophysical well-logs from geologic basins containing tens of thousands of oil and gas wells to create three-dimensional earth models of the depositional framework.

Twelve thousand geophysical well-logs from the Fort Worth Basin, in Texas, were scanned and digitized. These Previous HitdigitalNext Hit well-logs were accumulated in a computer database system that allowed for their selection, display, and stratigraphic correlation. The process required that 100 to 300 well-logs be displayed on the screen simultaneously in order to generate cross-sectional views of the stratigraphic section.

Utilizing allostratigraphic correlating techniques that focus on the correlation of discontinuities apparent in the geophysical well-log character, Previous HitdigitalNext Hit correlations were captured for over 40 surfaces. These surfaces included erosional unconformities, major flooding surfaces, and various para-sequence boundaries. The regional character of these events was readily apparent when viewed in high-density cross-sections that were created through the simultaneous display of geophysical well-logs for hundreds of wells.

From the stratigraphic correlations made in the cross-sections it was possible to generate structure and gross-isopach maps. Additional maps useful in identifying the presence of clean sand or limestone were created using Previous HitcalculationsNext Hit based on gamma-ray log readings. High-density geophysical well-log correlation represents a new methodology for regional stratigraphic analysis in mature oil and gas basins.

 

AAPG Search and Discover Article #90078©2008 AAPG Annual Convention, San Antonio, Texas