3D modelling of grain size distribution in Quaternary deltaic deposits (Llobregat Delta, NE Spain)
Cabello López, Patricia (Universitat de Barcelona. Departament d'Estratigrafia, Paleontologia i Geociències Marines)
Cuevas, J. L.
Ramos Guerrero, Emilio (Universitat de Barcelona. Departament d'Estratigrafia, Paleontologia i Geociències Marines)
Universitat de Barcelona. Departament d'Estratigrafia, Paleontologia i Geociències Marines
Universitat de Barcelona. Geomodels-Group of Geodynamics and Basin Analysis

Date:	2007
Abstract:	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 to D), 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 sandy lenticular bodies (up to 20 m wide, up to a few decimetres thick), within a homogenous, medium-grained sandy background, interpreted as prograding foreshore bars. 3D facies models, built by using the sequential conditional indicator simulation method, reproduced the sedimentary heterogeneities identified in Unit B, using as input data the sedimentary body geometry and its correlation with sandstone grain size values, with the grain size modes taken as a continuous, quantitative proxy for facies distribution. The simulations not only reproduced satisfactorily the significant sedimentary heterogeneities generated by the facies arrangement, but also predicted and described the spatial relation and the three-dimensional shape of sedimentary bodies accurately. Quality of the models should be ensured by a consistent prior analysis of the spatial structure of the grain size mode based on semivariogram models.
Rights:	Aquest document està subjecte a una llicència d'ús Creative Commons. Es permet la reproducció total o parcial, la distribució, la comunicació pública de l'obra i la creació d'obres derivades, sempre i quan aquestes es distribueixin sota la mateixa llicència que regula l'obra original i es reconegui l'autoria.
Language:	Anglès
Document:	Article ; recerca ; Versió publicada
Subject:	Llobregat delta ; Physical properties ; Facies modelling ; Sequential conditional indicator simulation
Published in:	Geologica acta, Vol. 5, Núm. 3 (2007) , p. 231-244, ISSN 1696-5728

Adreça alternativa: https://raco.cat/index.php/GeologicaActa/article/view/82360
Adreça alternativa: https://revistes.ub.edu/index.php/GEOACTA/article/view/105.000000296
Adreça alternativa: https://revistes.ub.edu/index.php/GEOACTA/article/view/1905
DOI: 10.1344/105.000000296

14 p, 1.5 MB

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