Print this pageInvestigating the Interaction of Sevier and Laramide Structural Development in the Rocky Mountains with 3D Seismic Mapping
Three 3-D seismic 
reflection
volumes have been procured by
BYU in the western Green River Basin (GRB), the southwestern Powder River Basin
(PRB), and the southern Uinta Basin (UB). State-of-the-art 3D visualization and
attribute analyses furnish precise and detailed images of the interaction of
Sevier (Mesozoic) and Laramide (Late
Cretaceous-Cenozoic) deformation episodes and structural styles.
The position of the GRB volume between the Sevier frontal thrust and Wind River thrust, where they begin to approach each other, provides an opportunity to investigate close interactions between Sevier and Laramide deformation. Alternatively, the PRB and UB volumes both represent regions that are proximal to areas of mainly Laramide deformation. We have prepared structure maps of prominent seismic horizons as well as seismic attribute extractions in order to map and characterize varying deformation styles within each of and between the three seismic volumes.
The GRB volume shows the most complex structural variation,
including both “thin-skinned” and “thick-skinned” deformation. Small
-scale compressional structures in places show dual vergence, suggesting either a component of strike-slip or
the interaction of two deformation episodes (Sevier and Laramide).
A complex pattern of deeper high-angle faulting appears to penetrate the entire
sequence and the top of basement and is accompanied by monoclinal
and anticlinal flexure. The PRB and UB volumes show
predominantly “thick-skinned” deformation with high-angle faults and/or
strike-slip faults cutting through large-scale asymmetric compressional
structures. The synoptic view provided from the three volumes allows a more
generalized characterization of Laramide vs. Sevier
subsurface deformation in the Rocky Mountain region.