--> Abstract: Sandbody Architecture of Basin Margin Shallow-Marine Delta Systems: The Eocene Roda Sandstone, Tremp-Graus Basin, Spain and the Cemalettin Formation, Boyabat Basin, Turkey, by Beate L. S. Leren, John Howell, Ediz Kirman, Allard W. Martinius, and W. Nemec; #90039 (2005)

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Sandbody Architecture of Basin Margin Shallow-Marine Delta Systems: The Eocene Roda Sandstone, Tremp-Graus Basin, Spain and the Cemalettin Formation, Boyabat Basin, Turkey

Beate L. S. Leren1, John Howell1, Ediz Kirman2, Allard W. Martinius3, and W. Nemec1
1 Bergen University, Bergen, Norway
2 Ankara University, Ankara, Turkey
3 Statoil, Trondheim, Norway

Shallow marine sandstones deposited at the margins of tectonically active basins form important but potentially complex reservoirs. This study demonstrates two outcrop case studies that characterise key issues relating to heterogeneity at the reservoir scale. Reservoir modelling of outcrop data has also highlighted the effects of these heterogeneities on fluid flow.

The Roda Sandstone of the southern Pyrenean foreland basin (Spain) comprises three seaward and southward stepping, delta-front packages that have been previously studied. Up dip to these delta-front systems are alluvial fan, fan-delta and lagoonal deposits. Bioturbated shorefaces lie along strike. Correlations from the medial to proximal sections indicates the importance of sediment portioning in fan and fan-delta systems during episodic base-level rise.

The Cemalettın Formation which crops-out in the Eocence Boyabat foreland basin of northern Turkey represents a shallow marine system that includes shoreface and mouthbar systems. Locally the shoreface deposits are cut by incised valleys. This study has focused on one of the incised valleys that is comprised of two “branches” each filled with their own Gilbert delta system that partly merge, and onlap each other. This part of the study highlights complexity associated with frequent minor uplifts and relative level falls.

The studied outcrop examples provide high 3D resolution and illustrate the complexity that can occur within delta systems in compressional settings. These complexities arise from the interplay between sedimentation and tectonics and are recorded by multiple phases of delta progradation and incisions. The analogue potential of these systems is also discussed.

AAPG Search and Discovery Article #90039©2005 AAPG Calgary, Alberta, June 16-19, 2005