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Reservoir properties and petrophysical modelling of carbonate sand bodies: outcrop analogue study in an epicontinental basin (Triassic, Germany)

By
Denis Palermo
Denis Palermo
Department of Geosciences, Centre of Applied Geosciences, University of Tübingen, Sigwartstr. 10, D-72076 Tübingen, GermanyEni S.p.A. – Exploration & Production Division, via Emilia 1, 20097 San Donato Milanese, Italy
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Thomas Aigner
Thomas Aigner
Department of Geosciences, Centre of Applied Geosciences, University of Tübingen, Sigwartstr. 10, D-72076 Tübingen, Germany
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Bjoern Seyfang
Bjoern Seyfang
Department of Geosciences, Centre of Applied Geosciences, University of Tübingen, Sigwartstr. 10, D-72076 Tübingen, GermanyPresent address: Centre Scientifique et Technique Jean Feger (CSTJF), Avenue Larribau, F-64018 Pau Cedex, France
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Sergio Nardon
Sergio Nardon
Eni S.p.A. – Exploration & Production Division, via Emilia 1, 20097 San Donato Milanese, Italy
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Published:
January 01, 2012

Abstract

This paper represents the second part of an integrated study that is focussed on the development and distribution of reservoir bodies and properties in epeiric carbonate systems. It is based on outcrop analogue data from Triassic ‘layer-cake’ carbonates in the South German Basin, which were deposited along an epicontinental, very gently inclined carbonate ramp. The reservoir facies consists of skeletal and oolitic carbonate grainstones (Φmax 23%, Kmax 700 mD), which are organized in a pronounced hierarchy of stratigraphic cycles. Based on outcrops, cores, gamma ray (GR) logs and thin sections, a high-resolution, geocellular 3D facies model was generated, which covers the area of a Middle East giant gas field (25×36 km). The spatial distribution of reservoir properties was systematically investigated on different scales. The lateral distribution of reservoir properties remains in the same order of magnitude for hundreds of metres, within in the same stratigraphic position. However, on a kilometre scale, facies bodies, diagenetic trends and thus reservoir properties show gradual lateral changes. Vertically, in contrast, properties change commonly on a decimetre scale and are largely controlled by stratigraphic cycles. Petrophysical modelling enhanced the understanding of key factors and processes controlling both reservoir quality and quantity.

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Contents

Geological Society, London, Special Publications

Advances in Carbonate Exploration and Reservoir Analysis

J. Garland
J. Garland
Cambridge Carbonates Ltd, UK
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J. E. Neilson
J. E. Neilson
University of Aberdeen, UK
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S. E. Laubach
S. E. Laubach
University of Texas at Austin, USA
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K. J. Whidden
K. J. Whidden
USGS, USA
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Geological Society of London
Volume
370
ISBN electronic:
9781862396180
Publication date:
January 01, 2012

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