Correlation of Geological Time Lines by Reducing Uncertainties to Regions — A Global Seismic Interpretation Workflow

Abstract

Global seismic interpretation solutions are changing trends in seismic interpretation because they allow auto-tracking of hundreds of seismic reflectors. A method for generating these horizons that utilizes an algorithm based on dip- and azimuth data is presented. Previously, interpreter input to the workflow was limited but with evolving technology, interpreters are now able to correlate polygonal regions bounded by horizons and faults, channels or mounds, manually. The result is more robust and minimizes uncertainties. A regional 2D line was selected to demonstrate the workflow and results. The line is located offshore Tanzania, which has seen increased interest in exploration activities in recent years. The setting is a combination of complex structural and stratigraphic elements and includes several channelized sections at different stratigraphic levels. These features make it ideal to demonstrate the workflow. By utilizing thousands of auto-picked events and adding constraints in an iterative manner, we were able to produce more reliable Wheeler (flattened) diagrams. The structural and Wheeler domains were then used to pick boundaries for packages where changes in stacking patterns or amplitude character were observed. “Regions” were then correlated manually to obtain time-equivalent RGT (Relative Geologic Time) lines, or iso-time lines, across the regional 2D line.

AAPG Datapages/Search and Discovery Article #90216 ©2015 AAPG Annual Convention and Exhibition, Denver, CO., May 31 - June 3, 2015