DBPapers
DOI: 10.5593/SGEM2016/B13/S06.129

TWO-WAY LINEAR INTERPOLATION USED FOR GENERATING ABSOLUTE PERMEABILITY DISTRIBUTIONS FOR HYDROCARBON RESERVOIRS

D.R. Jacota, C. Patrascioiu, B. Doicin
Tuesday 6 September 2016 by Libadmin2016

References: 16th International Multidisciplinary Scientific GeoConference SGEM 2016, www.sgem.org, SGEM2016 Conference Proceedings, ISBN 978-619-7105-57-5 / ISSN 1314-2704, June 28 - July 6, 2016, Book1 Vol. 3, 1019-1026 pp

ABSTRACT
Computerized flow simulations use grids that are made up of a large number of cells,
depending on the reservoir size or on the desired accuracy of the future representation.
In either way, the grid cells have to be populated with the flow-dependent parameters in
order to conduct the simulation. The base point of generating the needed parameters
starts from the available data points which represents isolated values, given the
comparison between the reservoir and the well size. In many Romanian hydrocarbon
reservoirs, only a single value is used and attributed to the whole reservoir, thus
impeding reservoir characterization. Linear interpolation is often used in pre-processors
to generate such distributions, but one has to be careful and take into account lithology
variation when applying this simple method. We extend the linear interpolation
approach to the situation where values are needed outside the known the data points.
The explanation consists in the fact that the grid has a maximum extension, and for the
zones inside the irregular polygon that is made up of the wells position, the interpolation
is applied on sets of three-points. For the zone outside this irregular polygon, only twopoint
pairs will be used. This latter approach is a bit risky, but if applied on small
distances from the irregular polygon, the errors generated should be within acceptable
ranges.

Keywords: simulation grids, flow parameter generation, two-way linear interpolation,
light risk