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Sedimentation and subsidence in the South Caspian Basin, Azerbaijan

By
Tim Green
Tim Green
1
BP Caspian Ltd
,
Chertsey Road, Sunbury TW 16 7LN, Middlesex
,
UK
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Nazim Abdullayev
Nazim Abdullayev
1
BP Caspian Ltd
,
Chertsey Road, Sunbury TW 16 7LN, Middlesex
,
UK
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Jake Hossack
Jake Hossack
2
BP
,
Chertsey Road, Sunbury TW 16 7LN, Middlesex
,
UK
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Greg Riley
Greg Riley
1
BP Caspian Ltd
,
Chertsey Road, Sunbury TW 16 7LN, Middlesex
,
UK
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Alan M. Roberts
Alan M. Roberts
3
Badley Geoscience Ltd
,
North Beck House, North Beck Lane, Hundleby, Spilsby, Lincolnshire, PE23 5NB
,
UK
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Published:
January 01, 2009

Abstract

The South Caspian Basin is believed to contain more than 20 km of Mesozoic and Tertiary sediments deposited on oceanic or thinned continental crust. Mesozoic, Palaeogene and Oligo-Miocene sediments have not been penetrated within the South Caspian Basin itself but are exposed onshore in the basin margins. The Pliocene–Recent sequence has been mapped on a regionally extensive grid of two-dimensional (2D) seismic data and penetrated by recently drilled exploration wells, and is over 7 km thick. Most of this sequence (6 km) is formed of fluvial–lacustrine deltaic sediments of the Pliocene Productive Series that are deposited unconformably above a marine Miocene shale sequence and form the principal hydrocarbon reservoirs in the basin. The Productive Series is overlain by about 1 km of Late Pliocene–Recent marine sediments

The thickness of the Pliocene sedimentary sequence implies that relatively rapid, late Tertiary subsidence occurred in the South Caspian Basin; however, there is no geological evidence of a tectonic event capable of generating a major thermal subsidence event at this time. Modelling presented in this paper suggests that it is possible to account for the observed pattern of subsidence and sedimentation in the South Caspian Basin by a process of sediment loading and compaction on a thermally subsiding, late Mesozoic crust without the need for additional Tertiary subsidence mechanisms. Crucially, this model interprets the Pliocene Productive Series to have been deposited in a topographic depression, isolated from the global oceanic system, in which base level was controlled by local factors rather than by global sea level.

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Contents

Geological Society, London, Special Publications

South Caspian to Central Iran Basins

M.-F. Brunet
M.-F. Brunet
CNRS-INSU and Université Pierre et Marie Curie, France
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M. Wilmsen
M. Wilmsen
Senckenberg Naturhistorische Sammlungen Dresden, Museum für Mineralogie und Geologie, Germany
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J. W. Granath
J. W. Granath
Granath & Associates Consulting Geology, USA
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Geological Society of London
Volume
312
ISBN electronic:
9781862395602
Publication date:
January 01, 2009

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