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Le Coz M., Genthon Pierre, Adler P. M. Multiple-point statistics for modeling facies heterogeneities in a porous medium : the Komadugu-Yobe alluvium, Lake Chad Basin. Mathematical Geosciences, 2011, 43 (7), p. 861-878. ISSN 1874-8961
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doi:10.1007/s11004-011-9353-6| Titre | Multiple-point statistics for modeling facies heterogeneities in a porous medium : the Komadugu-Yobe alluvium, Lake Chad Basin |
| Année de publication | 2011 |
| Type de document | Article référencé dans le Web of Science WOS:000296796200007 |
| Auteurs | Le Coz M., Genthon Pierre, Adler P. M. |
| Source | Mathematical Geosciences, 2011, 43 (7), p. 861-878. ISSN 1874-8961 |
| Résumé | Multiple-point statistics are used to model facies heterogeneities in the vadose zone of the Komadugu-Yobe River valley (southeastern Niger) which is presently submitted to an undergoing intensive agricultural development; therefore, increasing quantitative and qualitative pressures are exerted on groundwater resources. The sand-clay heterogeneities are analyzed by means of a Landsat image acquired during a high flow period over a 160 km stretch in the downstream part of the valley and a set of 50 boreholes drilled near the town of Diffa (4 km x 4 km area). The horizontal variograms of heterogeneities are characterized by a noticeably constant length scale of 380 m and clayey objects are shown to be randomly distributed in space according to a Poisson process. A set of two-dimensional vertical images is built based on a Boolean procedure and the Snesim algorithm is used to simulate synthetic three-dimensional media. When the vertical correlation length is fitted, the three-dimensional model satisfactorily reproduces the second order statistics of heterogeneities and the specific facies patterns. |
| Plan de classement | 064 ; 020 |
| Localisation | Fonds IRD [F B010054170] ; Niamey |
| Identifiant IRD | fdi:010054170 |
| Lien permanent | http://www.documentation.ird.fr/hor/fdi:010054170 |
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