HR: 08:00h
AN: H11J-01    [Abstracts]
TI: Fluid Flow Simulation For CO2–EOR and Sequestration Utilizing Geomechanical Constraints – Teapot Dome Oil Field, Wyoming
AU: * Chiaramonte, L
EM: chiarlau@stanford.edu
AF: Geophysics Department - Stanford University, 397 Panama Mall, Room 360, Stanford, ca 94305, United States
AU: Zoback, M D
AF: Geophysics Department - Stanford University, 397 Panama Mall, Room 360, Stanford, ca 94305, United States
AU: Friedmann, J
EM: friedmann@llnl.gov
AF: Lawrence Livermore National Laboratory, 7000 East Ave, Livermore, ca 94550, United States
AU: Stamp, V
EM: vicki.stamp@rmotc.doe.gov
AF: Rocky Mountain Oilfield Testing Center (RMOTC), 907 N. Poplar, Suite 150, Casper, wy 82601, United States
AB: Mature oil and gas reservoirs are attractive targets for geological sequestration of CO₂ because of their potential storage capacities and the possible cost offsets from enhanced oil recovery (EOR). In this work we develop a 3D reservoir model and fluid flow simulation of the Tensleep Formation using geomechanical constraints to evaluate the feasibility of a CO₂-EOR injection project at Teapot Dome Oil Field, WY. The objective of this work is to model the migration of the injected CO₂ as well as to obtain limits on the rates and volumes of CO₂ that can be injected without compromising seal integrity. Teapot Dome is an elongated asymmetrical, basement-cored anticline with a north-northwest axis. It is part of the Salt Creek structural trend, located in the southwestern edge of the Powder River Basin. The Tensleep Fm. in this area consists of interdune deposits such as eolian sandstones, sabkha carbonates, evaporites (mostly anhydrite), and some very low permeability dolomicrites. The average porosity is 0.10 ranging from 0.05-0.20. The average permeability is 30 mD, ranging from 10 – 100 mD. The average reservoir thickness is 50 ft. The reservoir has strong aquifer drive. In the area under study, the Tensleep Fm. has its structural crest at 1675 m. It presents a 3-way closure trap against a NE-SW fault to the north. We previously carried out a geomechanical stability analysis and found this fault to be able to support the increase in pressure due to the CO₂ to be injected, even if the structure was "filled-to-spill". In this work we combine our previous geomechanical analysis, geostatistical reservoir modeling and fluid flow simulations to investigate critical questions regarding the feasibility of a CO₂-EOR project in the Tensleep Fm. The analysis takes into consideration the initial trapping and sealing mechanisms of the reservoir, the consequences of past and present oil production on the initial properties, and the potential effect of CO₂ injection on both the reservoir and the seal. Finally, we want to predict the long-term oil recovery of the injection site and what will happen in the system once oil production stops.
DE: 8168 Stresses: general
SC: Hydrology [H]
MN: 2007 Fall Meeting