1. Modeling Natural Fracture Networks in the Context of Flow Simulations: Teapot Dome, Wy
Thomas H. Wilson, Department of Geology and Geography, West Virginia University, Morgantown, WV 26506
Many naturally occurring hydrocarbon reservoirs have very small matrix porosity and permeability making reserves difficult to extract . In many of these reservoirs, production is made possible through the presence of naturally occurring fracture systems. Oil production from the Tensleep Formation in the subsurface of the Teapot Dome in north central Wyoming is controlled by a natural fracture network. However, considerable oil remains trapped in the reservoir matrix. The objectives of this study are to gain a detailed understanding of the fracture network controlling production from the Tensleep reservoir and to conduct flow simulations that will help design approaches to extract remaining reserves from the reservoir matrix. We’ve completed characterization of the reservoir fracture network and bounding formations and are in the process of developing layered models for use in reservoir flow simulations. The ultimate outgrowth of this research effort is to develop a model reservoir fracture network consistent with the well bore observations that also accurately models oil production history from the Tensleep reservoir. The results of the study can then be incorporated into future enhanced oil recovery operations and carbon storage efforts at Teapot Dome as well as in other analogous reservoir settings.
Seismic time slice showing major faults within the field
Local model of fracture network in the A Sandstone
Field Scale Fracture realization