About This Item

Share This Item

The AAPG/Datapages Combined Publications Database

Tulsa Geological Society

Abstract


2003 Midcontinent Section Meeting (Tulsa) Papers and Abstracts, 2003

Outcrop and Seismic Analysis of Natural Fractures, Faults and Structure at Teapot Dome, Wyoming: Abstract

Scott P. Cooper1, Bruce Hart2, Laurel B. Goodwin3, John Lorenz4, Mark Milliken5

Abstract

A systematic study of natural fractures in outcrop at Teapot Dome documented three throughgoing fracture sets. The oldest fracture set is oblique to the hinge of the anticlinal fold. A second set of fractures consists of bed-normal extension fractures striking subparallel to the fold hinge. A third set consists of bed-normal extension fractures striking normal to the fold hinge. In many areas this fracture set is spatially related and subparallel to NE-striking, normal dip-slip and normal oblique-slip faults that maintain a roughly perpendicular orientation to the fold hinge. Fractures, deformation bands and faults that have a normal sense of displacement are also observed

Recent and ongoing analyses of new 3-D seismic data show normal faults in the upper stratigraphic units and thrust faults in lower Paleozoic units. Slight differences in fault orientation (up to 10 degrees) from near-surface to near-basement indicate that the orientation as well as the magnitude of induced stresses varied with depth during formation of the anticline. Therefore a complex interplay of Laramide stresses with pre-existing basement structures are responsible for uplift of Teapot Dome. Fracture-abutting relationships and the spatial relationship of fractures, deformation bands, and faults relative to the fold also indicate the deformation process was a dynamic interactive system, wherein progressive folding was driven by displacement on the basement-involved thrust fault. Fractures and normal faulting perpendicular and parallel to the fold hinge accommodated extension in two directions associated with the three-dimensional draping of beds above the thrust.


 

Acknowledgments and Associated Footnotes

1 Sandia National Laboratories, Albuquerque, NM

2 McGill University, Montreal, QC

3 New Mexico Institute of Mining and Technology, Socorro, NM

4 Sandia National Laboratories, Albuquerque, NM

5 Rocky Mountain Oilfield Testing Center, Casper, WY

Copyright © 2006 by the Tulsa Geological Society