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Book Chapter

Salt pillows and localization of early structures: case study in the Ucayali Basin (Peru)

By
I. Moretti
I. Moretti
1
IFP Energies Nouvelles, Direction Geology-Geochemistry-Geophysics, 4 Avenue de Bois Préau, 92852 Rueil Malmaison, France
2
GDFSUEZEPI, DEG, 1 Place Samuel de Champlain, 92930 Paris La Défense Cedex, France
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J. P. Callot
J. P. Callot
1
IFP Energies Nouvelles, Direction Geology-Geochemistry-Geophysics, 4 Avenue de Bois Préau, 92852 Rueil Malmaison, France
3
LFCR, IPRA, avenue de l'Université, Université de Pau et des Pays de l'Adour, 64013, Pau, France
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M. Principaud
M. Principaud
1
IFP Energies Nouvelles, Direction Geology-Geochemistry-Geophysics, 4 Avenue de Bois Préau, 92852 Rueil Malmaison, France
4
Present address: Université Bordeaux 1, UMR 5805 – EPOC, Bat B18, Avenue des Facultés, 33405 Talence, France
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D. Pillot
D. Pillot
1
IFP Energies Nouvelles, Direction Geology-Geochemistry-Geophysics, 4 Avenue de Bois Préau, 92852 Rueil Malmaison, France
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Published:
January 01, 2013

Abstract

In many compressive zones, there is a risk of undercharged hydrocarbon prospects as a result of timing, that is, the growth of the structure is younger than the main fluid migration phase. The North Ucayali Basin represents a setting of this type, where locating the earliest structures is crucial for well placement. In the North Ucayali Basin, the variable amount of erosion at the top of the structures shows that they are not uniformly recent. Although the growth of early structures may be explained by the reactivation of inherited features during shortening, evaporitic pillows may represent an alternative factor controlling the localization of deformation in the studied area. Indeed, subsurface data reveal the presence of flat salt domes that have an influence on thrust localization. The existence and tips of such efficient gliding surfaces concentrate the strain and, as a result, localize the early zones of deformation. Analogue models designed to study these phenomena highlight the crucial role of salt pillows as potential weak zones localizing deformation ahead of the propagating wedge. These models also emphasize the need to constrain certain parameters that have been previously disregarded, including the thickness of the brittle layers between the main décollement level (if present) and the pillows, as well as their burial depth.

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Contents

Geological Society, London, Special Publications

Thick-Skin-Dominated Orogens: From Initial Inversion to Full Accretion

M. Nemčok
M. Nemčok
EGI, University of Utah, USA
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A. Mora
A. Mora
Ecopetrol S. A., Colombia
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J. W. Cosgrove
J. W. Cosgrove
Royal School of Mines, UK
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Geological Society of London
Volume
377
ISBN electronic:
9781862396388
Publication date:
January 01, 2013

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