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The AAPG/Datapages Combined Publications Database
AAPG Bulletin
Abstract
DOI:10.1306/01021312054
Improved geostatistical models of inclined heterolithic strata for McMurray Formation, Alberta, Canada
Mehran M. Hassanpour,1 Michael J. Pyrcz,2 Clayton V. Deutsch3
1Centre for Computational Geostatistics, 3-133 Natural Resources Engineering Facility Building, University of Alberta, Edmonton, Alberta, Canada; [email protected]
2Chevron Energy Technology Company, 1500 Louisiana Street, Houston, Texas; [email protected]
3Centre for Computational Geostatistics, 3-133 Natural Resources Engineering Facility Building, University of Alberta, Edmonton, Alberta, Canada; [email protected]
ABSTRACT
The McMurray Formation of northern Alberta in Canada contains multiscale complex geologic features that were partially formed in a fluvial-estuarine depositional environment. The inclined heterolithic strata deposited as part of fluvial point bars contain continuous centimeter-scale features that are important for flow characterization of steam-assisted gravity drainage processes. These channels are common, extensive, and imbricated over many square kilometers. Modeling
the detailed facies in such depositional systems requires a methodology that reflects heterogeneity over many scales. This article presents an object-based facies
modeling
technique that (1) reproduces the geometry of multiscale geologic architectural elements seen in the McMurray Formation outcrops and (2) provides a grid-free framework that models these geologic objects without relating them to a grid system. The grid-free object-based
modeling
can be applied to any depositional environment and allows for the complete preservation of architectural information for consistent application to any gridding scheme, local grid refinements, downscaling, upscaling, drape surface, locally variable azimuths, property trend
modeling
, and flexible model interaction and manipulation. Features millimeters thick or kilometers in extent are represented very efficiently in the same model.
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