Biogenically enhanced reservoir properties in the Medicine Hat gas field, Alberta, Canada

La Croix, Andrew D., Gingras, Murray K., Pemberton, S. George, Mendoza, Carl A., MacEachern, James A. and Lemiski, Ryan T. (2013) Biogenically enhanced reservoir properties in the Medicine Hat gas field, Alberta, Canada. Marine and Petroleum Geology, 43 464-477. doi:10.1016/j.marpetgeo.2012.12.002


Author La Croix, Andrew D.
Gingras, Murray K.
Pemberton, S. George
Mendoza, Carl A.
MacEachern, James A.
Lemiski, Ryan T.
Title Biogenically enhanced reservoir properties in the Medicine Hat gas field, Alberta, Canada
Journal name Marine and Petroleum Geology   Check publisher's open access policy
ISSN 0264-8172
1873-4073
Publication date 2013-05-01
Year available 2012
Sub-type Article (original research)
DOI 10.1016/j.marpetgeo.2012.12.002
Open Access Status Not yet assessed
Volume 43
Start page 464
End page 477
Total pages 14
Place of publication London, United Kingdom
Publisher Elsevier
Language eng
Abstract Spot-minipermeametry and micro-CT analytical techniques were employed to evaluate the effect(s) of bioturbation on porosity and permeability distributions in reservoir facies of the highly prolific Medicine Hat gas field of Alberta, Canada. This study focuses on five cm-scale samples that occur at different stratigraphic positions and intersect discrete bioturbated horizons within the Medicine Hat Member. Spot-minipermeability results demonstrate that permeability in bioturbated sandstones is up to two orders of magnitude greater than those of the muddy matrix, thus corresponding to a dual-porosity fluid flow system. Graphing bioturbation intensity versus measured permeability indicates that burrows are well connected horizontally and provide flow conduits. Micro-CT models reveal that burrowed sandstones are isolated and planiform in character; rare interpenetrations from vertically oriented trace fossils serve to interconnect these hydraulically isolated strata. Results show that bioturbated sandstones possess reservoir properties comparable to those associated with laminated sandstones, yielding an anisotropic porous medium. Understanding the impact of trace fossils on porosity-permeability distributions in the Medicine Hat gas field can be used to identify potential reservoir from previously interpreted non-reservoir rock, and, ultimately, improve reserve estimations.
Keyword Bioturbation
Porosity
Permeability
Reservoir quality
Micro-CT
Spot-minipermeametry
Medicine Hat gas field
Ichnology
Q-Index Code C1
Q-Index Status Provisional Code
Institutional Status Non-UQ

Document type: Journal Article
Sub-type: Article (original research)
Collection: School of Earth Sciences Publications
 
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Created: Wed, 15 Mar 2017, 12:58:12 EST by Andrew La Croix on behalf of UQ Energy Initiative