3D modelling of grain size distribution in Quaternary deltaic deposits (Llobregat Delta, NE Spain)

Geologica Acta

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Title 3D modelling of grain size distribution in Quaternary deltaic deposits (Llobregat Delta, NE Spain)
 
Creator Cabello López, Patricia
Cuevas, J. L.
Ramos Guerrero, Emilio
 
Subject Llobregat delta. Physical properties. facies modelling. Sequential conditional indicator simulation.
 
Description 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.
 
Publisher Geologica Acta
Geologica Acta
Geologica Acta
 
Contributor
 
Date 2007-01-13
 
Type info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion

 
Format application/pdf
 
Identifier http://revistes.ub.edu/index.php/GEOACTA/article/view/105.000000296
10.1344/105.000000296
 
Source Geologica Acta; Vol 5, No 3; 231-244
Geologica Acta; Vol 5, No 3; 231-244
Geologica Acta; Vol 5, No 3; 231-244
1696-5728
1695-6133
 
Language eng
 
Relation http://revistes.ub.edu/index.php/GEOACTA/article/view/105.000000296/4232
 
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