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Spontaneous fluid emissions in the Northern Apennines: geochemistry, structures and implications for the petroleum system

By
Rossella Capozzi
Rossella Capozzi
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Vincenzo Picotti
Vincenzo Picotti
Dipartimento di Scienze della Terra e Geologico-Ambientali
,
University of Bologna
,
Via Zamboni 67, 40127 Bologna
,
Italy
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Published:
January 01, 2010

Abstract

Natural seeps in the Northern Apennines document a variability of fluids and reservoirs in terms of origin, age and evolution. Their spatial distribution appears controlled by the presence or absence of the tectonic overburden provided by the Ligurian nappe. The general trend of deepening of the Mesozoic basement toward the internal part of the thrust belt is reflected by the nature of the seeps, characterized by thermogenic methane and oil at the foothills, whereas the innermost seeps show occurrence of dry thermogenic gas suggesting overcooking of the residual oil. At the front of the Ligurian nappe, or in places never covered by it, the seepages are associated with biogenic methane related to bacterial degradation of the organic-rich intervals occurring in the Pliocene and Pleistocene marine succession. The coupling of geochemical and structural analysis allows reconstructing the tectono-thermal evolution of the belt, improving our knowledge on the processes acting within the reservoir and controlling important parameters of the petroleum system, such as the reservoir porosity and its modifications, and the migration patterns.

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Contents

Geological Society, London, Special Publications

Hydrocarbons in Contractional Belts

G. P. Goffey
G. P. Goffey
PA Resources UK Ltd, UK
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J. Craig
J. Craig
Eni Exploration and Production Division, Italy
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T. Needham
T. Needham
Needham Geoscience Ltd, UK
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R. Scott
R. Scott
CASP, University of Cambridge, UK
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Geological Society of London
Volume
348
ISBN electronic:
9781862395961
Publication date:
January 01, 2010

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