Boundary assessment under uncertainty: A case study |
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Authors: | V. Pawlowsky R. A. Olea J. C. Davis |
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Affiliation: | (1) Dept. de Matemàtica Aplicada III, Universitat Politècnica de Catalunya, Gran Capitán s/n, 08034 Barcelona, Spain;(2) Mathematical Geology Section, Kansas Geological Survey, The University of Kansas, 66047 Lawrence, Kansas |
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Abstract: | Estimating certain attributes within a geological body whose exact boundary is not known presents problems because of the lack of information. Estimation may result in values that are inadmissible from a geological point of view, especially with attributes which necessarily must be zero outside the boundary, such as the thickness of the oil column outside a reservoir. A simple but effective way to define the boundary is to use indicator kriging in two steps, the first for the purpose of extrapolating control points outside the body, the second to obtain a weighting function which expresses the uncertainty attached to estimations obtained in the boundary region. |
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Keywords: | contouring indicator kriging reservoir characterization |
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