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| Formato: | Artículo científico |
| Lenguaje: | en |
| Publicado: |
Universitat de Barcelona
2007
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| Acceso en línea: | https://www.redalyc.org/articulo.oa?id=50550302 |
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- 3D modelling of grain size distribution in Quaternary deltaic deposits (Llobregat Delta, NE Spain) P. Cabello J. L. Cuevas E. Ramos Ciencias de la Tierra Llobregat delta Facies modelling Physical properties Sequential conditional indicator simulation The Llobregat delta constitutes a Pliocene-Quaternary sequence recording progradation. An 8 meter-thick,delta-plain succession temporarily accessible in the subaerial delta plain was sub-divided into four units (A toD), which constitute a shallowing upwards sequence recording sedimentation from shoreface at the bottom(Unit A) to lacustrine settings at the top (Unit D). Unit B basically comprises gravelly, coarse-grained sandylenticular bodies (up to 20 m wide, up to a few decimetres thick), within a homogenous, medium-grained sandybackground, interpreted as prograding foreshore bars. 3D facies models, built by using the sequential conditionalindicator simulation method, reproduced the sedimentary heterogeneities identified in Unit B, using as inputdata the sedimentary body geometry and its correlation with sandstone grain size values, with the grain sizemodes taken as a continuous, quantitative proxy for facies distribution. The simulations not only reproducedsatisfactorily the significant sedimentary heterogeneities generated by the facies arrangement, but also predictedand described the spatial relation and the three-dimensional shape of sedimentary bodies accurately. Quality ofthe models should be ensured by a consistent prior analysis of the spatial structure of the grain size mode basedon semivariogram models 2007 artículo científico 1695-6133 https://www.redalyc.org/articulo.oa?id=50550302 en http://www.redalyc.org/revista.oa?id=505 Geologica Acta: an international earth science journal application/pdf Universitat de Barcelona Geologica Acta: an international earth science journal (España) Num.3 Vol.5