Browsing NR vitenarkiv by Author "Hauge, Ragnar"
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Bayesian seismic 4D inversion for lithology and fluid prediction
Kjønsberg, Heidi; Hauge, Ragnar; Nilsen, Carl-Inge Colombo; Ndingwan, Abel Onana; Kolbjørnsen, Odd (Peer reviewed; Journal article, 2024)Seismic data acquired at different times over the same area can provide insight into changes in an oil/gas reservoir. Probabilities for pore fluid will typically change, whereas the lithology remains stable over time. This ... -
Bayesian seismic inversion for stratigraphic horizon, lithology, and fluid prediction
Kolbjørnsen, Odd; Buland, Arild; Hauge, Ragnar; Røe, Per; Ndingwan, Abel Onana; Aker, Eyvind (Peer reviewed; Journal article, 2020)We have developed an efficient methodology for Bayesian prediction of lithology and pore fluid, and layer-bounding horizons, in which we include and use spatial geologic prior knowledge such as vertical ordering of ... -
A Tree Representation of Pluri-Gaussian Truncation Rules
Sektnan, Audun; Almendral Vazquez, Ariel; Hauge, Ragnar; Aarnes, Ingrid; Skauvold, Jacob; Vevle, Markus Lund (Journal article; Peer reviewed, 2024)Stochastic facies models based on truncated Gaussian random fields are known for being flexible and well suited to reproduce patterns and features from analogues or conceptual models. In pluri-Gaussian simulation, the ... -
Using Pattern Counts to Quantify the Difference Between a Pair of Three-Dimensional Realizations
Lilleborge, Marie; Hauge, Ragnar; Fjellvoll, Bjørn; Abrahamsen, Petter (Journal article; Peer reviewed, 2024)When comparing different ways of modeling discrete three-dimensional realizations such as facies, it is useful to have a measure of difference (or similarity) in the geometry of these realizations.We propose a method for ... -
A volume-conserving representation of cell faces in corner point grids
Røe, Per; Hauge, Ragnar (Journal article; Peer reviewed, 2015)Corner point grids is currently the standard grid representation for use in reservoir simulation. The cell faces in corner point grids are traditionally represented as bilinear surfaces where the edges between the corner ...