Abstract
The simplest quantity that can be measured from an image showing different facies or lithotypes is the percentage of space taken up by each facies. So the first step in a plurigaussian study is to calculate the proportions from the experimental data. In the stationary case, we only need calculate the percentage of all the data that belong to each facies to get the proportions. However in most practical cases, the geology is more complicated. For example, petroleum reservoirs are not stationary in the vertical direction because of cyclic changes during their deposition. Vertical proportion curves were designed to quantify these changes. We will show how to compute and interpret these curves. In more complicated cases the proportions vary laterally as well. In that case we build up a 3D matrix of proportion curves. Although plurigaussian simulations were first developed for the oil industry, they are now used in mining as well. Proportion curves and 3D proportion matrices are also used there to estimate the proportions of each rock type.
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Armstrong, M. et al. (2011). Proportions. In: Plurigaussian Simulations in Geosciences. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-642-19607-2_4
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DOI: https://doi.org/10.1007/978-3-642-19607-2_4
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