Methodology for quantifying uncertainty versus data spacing applied to the oil sands

CIM Journal, Vol. 4, No. 4, 2013
B. J. Wilde and C. V. Deutsch University of Alberta, Department of Civil & Environmental Engineering Markin/CNRL Natural Resources Engineering Facility Edmonton, Alberta, Canada
Abstract The inevitable uncertainty in modeling spatial variables decreases as more data become available. This reduction depends on the properties of the variable being modeled. Spatially continuous variables show less uncertainty for a given spacing than erratic variables. A geostatistical simulation based approach is developed to quantify the relationship between uncertainty and data spacing. Reference realizations are sampled to condition additional realizations and quantify uncertainty. The procedure is automated, making it straightforward to consider sensitivity and different geological domains. A case study of the relationship between uncertainty and data spacing for net oil sands thickness data from Northern Alberta is presented.
Keywords: Simulation, Sampling, Data spacing, Uncertainty, Data density, Sequential Gaussian simulation, Conditional realizations, Geostatistics
Résumé L’inévitable incertitude dans la modélisation de variables spatiales décroît à mesure que plus de données sont disponibles. Cette réduction dépend des propriétés de la variable à modéliser. Les variables continues dans l’espace montrent moins d’incertitude pour un espacement donné que les variables erratiques. Une approche basée sur la simulation géostatistique est développée pour quantifier la relation entre l’incertitude et l’espacement des données. L’actualisation des références est échantillonnée afin de conditionner les actualisations additionnelles et de quantifier l’incertitude. La procédure est automatisée, la rendant capable de considérer la sensibilité et les différents domaines géologiques. Une étude de cas présente les relations entre l’incertitude et l’espacement des données pour les données nettes sur l’épaisseur des sables bitumineux du Nord de l’Alberta.
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Publication: CIM Journal
Issue: 4
Volume: 4
Year: 2013
Text
Summary: The settling, shear strength, and index properties of oil sands fines-sand mixture tailings (FSMT) for a wide range of solids and fines content are investigated. Results indicate that the liquid limit of FSMT obeys a linear mixture law. The fines-water ratio (FWR) governs the permeability of composite tailings (CT) and CT with comparable geotechnical behaviour can be produced from the same initial FWR mixtures. A phosphogypsum (PG) dosage > 900 mg/kg does not improve the dewatering behaviour...
Publication: CIM Journal
Author(s): A. R. Sorta, D. C. Sego, and G.W. Wilson
University of Alberta, Department of Civil & Environmental Engineering
Markin/CNRL Natural Resources Engineering Facility
Edmonton, Alberta, Canada
Keywords: Composite tailings (CT), Fines-sand mixture tailings (FSMT), Oil sands tailings, Atterberg limits, Shear strength, Mature fines tailings (MFT), Sand-fines ratio (SFR), Fines-water ratio (FWR), Phosphogypsum (PG)
Issue: 4
Volume: 4
Year: 2013
Text
Summary: Solvent extraction is used in many acid leach uranium circuits to upgrade and purify the uranium-bearing solution prior to final product precipitation. A number of strip options are available to recover the uranium from the loaded organic. This paper compares seven of these options on the basis of typical capital and operating costs for the solvent extraction circuit and downstream uranium processing and also considers other related issues. The aim is to provide an objective comparative...
Publication: CIM Journal
Author(s): D. van Tonder
AMEC Mining & Metals
Perth, Western Australia

C. Edwards
AMEC Americas Ltd.
Saskatoon, Saskatchewan, Canada
Keywords: Uranium, Solvent extraction (SX), Solvent extraction stripping, Uranium product precipitation, Nanofiltration (NF)
Issue: 4
Volume: 4
Year: 2013
Text
Summary: Nickel compounds vary significantly in their toxicological properties, so it is critical that continuing studies to accurately quantify worker exposures consider the processing that accompanies refining nickel-containing materials. The Clydach nickel refinery, which has operated for more than 100 years, was the first nickel-producing facility to show a high risk for lung and nasal-sinus cancers among workers employed since it opened in 1902. Process chemistry and equipment have changed...
Publication: CIM Journal
Author(s): K. Lascelles
Vale Europe Ltd., Clydach refinery
Clydach, West Glamorgan, Wales

B. R. Conard
BRConard Consulting, Inc.
Oakville, Ontario, Canada
Keywords: Nickel refining, Nickel tetracarbonyl, Clydach refinery, Inco, Process history
Issue: 4
Volume: 4
Year: 2013
Text
Summary: An iron ore recovery plant was operated by Inco from 1955 to
1980 near Sudbury, Ontario. As exposures to specific nickel substances have been
associated with adverse respiratory endpoints, it is important to understand
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This manuscript discusses the process and equipment, the propensity for
aerosol formation, and operational procedures used by Inco in roasting a
pyrrhotite concentrate, reducing the nickel in the formed oxide, leaching the...
Publication: CIM Journal
Author(s): B. R. Conard</br>
BRConard Consulting, Inc, Oakville, ON</br>
Issue: 4
Volume: 4
Year: 2013
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