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Geologic Note |
1 Department of Earth and Atmospheric Sciences, 1-26 Earth Sciences Building, University of Alberta, Edmonton, Alberta, Canada, T6G 2E3; mgingras{at}ualberta.ca
2 Department of Earth and Atmospheric Sciences, 1-26 Earth Sciences Building, University of Alberta, Edmonton, Alberta, Canada, T6G 2E3
3 Department of Earth and Atmospheric Sciences, 1-26 Earth Sciences Building, University of Alberta, Edmonton, Alberta, Canada, T6G 2E3
Murray Gingras received his diploma in mechanical engineering technology from the Northern Alberta Institute of Technology in 1987, his B.Sc. degree from the University of Alberta in 1995, and his Ph.D. from the University of Alberta in 1999. Gingras has worked professionally in the hydrocarbon industry, at the Northern Alberta Institute of Technology, and as an assistant professor at the University of New Brunswick. His research focuses on applying sedimentology and ichnology to sedimentary rock successions, as a paleoecological tool, a reservoir development tool, and in process-driven sedimentology.Carl Mendoza received a B.A.Sc. degree in geological engineering from the University of British Columbia in 1984. He worked for Shell Canada Resources for more than two years, before obtaining his M.Sc. degree and his Ph.D. in hydrogeology from the University of Waterloo. He has been at the University of Alberta since 1992 and is currently an associate professor. His research focuses on reactive gas and vapor transport in the unsaturated zone, ground-water/surface-water interactions at both natural and oil-sands impacted sites, and flow and transport in heterogeneous porous media.
S. George Pemberton is a professor in the Department of Earth & Atmospheric Sciences at the University of Alberta. He is a Fellow of the Royal Society of Canada and holds a Canada Research Chair in Petroleum Geology (Natural Sciences and Engineering Research Council). George's field of research and expertise are in the field of ichnology, the investigation of animal-sediment interactions in both recent and ancient environments. Current research activities include the application of trace-fossil studies in sequence stratigraphy and the exploration and exploitation of hydrocarbons. Recent research activities involve emphasis on the Cardium and Viking formations, the Athabasca and the Cold Lake oil sands of Alberta, as well as the offshore Hibernia, Ben Nevis, Terra Nova, and Venture fields.
Burrow-associated, selective dolomitization in the Yeoman Formation limestone (Ordovician, Williston basin) is characterized by distinct textural heterogeneity. Physical parameters such as permeability, porosity, tortuosity, and dispersivity are therefore difficult to assess. This study compares the relative dispersivities of three geologic media: homogeneous sandstone, fractured limestone, and burrowed dolomitic limestone. Results show that the flow paths present in burrow-associated dolomite are tortuous, and that the interaction between the flow paths and the matrix is extensive. Such rocks act as dual-permeability systems in the subsurface. Hydrocarbon production from such deposits will be strongly influenced by burrow-related heterogeneity, and its influence should be carefully considered before secondary recovery schemes are implemented.
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