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3D structural and thermal modelling of Mesozoic petroleum systems in the Po Valley Basin, northern Italy

Claudio Turrini, Barbara Bosica, Paul Ryan, Peter Shiner, Olivier Lacombe and François Roure
Petroleum Geoscience, 12 October 2017, https://doi.org/10.1144/petgeo2017-031
Claudio Turrini
CTGeolConsulting, 78100, St Germain-en-Laye, France
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Barbara Bosica
Petroceltic Italia, Via Ennio Quirino Visconti 20, Roma 00193, Italy
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Paul Ryan
Petroceltic International plc, 3 Grand Canal Plaza, Grand Canal Street Upper, Dublin 4, Ireland
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Peter Shiner
Petroceltic Italia, Via Ennio Quirino Visconti 20, Roma 00193, Italy
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Olivier Lacombe
Sorbonne Universités, UPMC Université Paris 06, CNRS, Institut des Sciences de la Terre de Paris (iSTeP), 4 place Jussieu, 75005 Paris, France
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François Roure
IFP-EN, 1 & 4 avenue de Bois-Préau 92852, Rueil-Malmaison, France Tectonic Group, Faculty of Geosciences, Department of Earth Sciences, Utrecht University, Budapestlaan 4, 3584 CD Utrecht, The Netherlands
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Abstract

1D and 3D basin modelling was performed to investigate the Mesozoic carbonate petroleum systems of the Po Valley Basin (northern Italy), through integration of a recent 3D structural model of the study area with the distribution of potential Triassic source rocks, rock properties and heat flow models.

Results from standard 1D maturity models show significant overprediction of the thermal maturity of deep Triassic carbonates in the western Po Valley, unless the effect of the substantial overpressure observed in these sequences is incorporated into the model. In order to further test this observation, two thermal scenarios were applied to the Po Valley 3D geo-volume: one based on the actual geological heat flow and a second model based on a reduced heat flow as a proxy for the delaying effect of overpressure on hydrocarbon maturation. The predictions of these two models were then compared with the observed hydrocarbon distribution in the western Po Valley.

Both thermal scenarios are broadly consistent with the observed hydrocarbon distribution at the scale of the basin but, in detail, the overpressure model provides a better match between the predicted charge available from the kitchen area's post-critical moment and observed volumes of hydrocarbons initially in place within the traps, as well as with the observed and predicted hydrocarbon phases, as measured by the gas/oil ratio (GOR) of the fluids. Overpressure probably significantly delayed hydrocarbon maturation in the western domain of the basin, confirming results from previous studies.

Beyond regional implications, and despite its relative simplicity and inherent uncertainties, the adopted approach demonstrates the potential of a consistent 3D integration of the thermostructural history of sedimentary basins to constrain the geometry and structural evolution of hydrocarbon-bearing traps, as well as the generation and migration of hydrocarbons into these traps.

  • © 2017 The Author(s)

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3D structural and thermal modelling of Mesozoic petroleum systems in the Po Valley Basin, northern Italy

Claudio Turrini, Barbara Bosica, Paul Ryan, Peter Shiner, Olivier Lacombe and François Roure
Petroleum Geoscience, 12 October 2017, https://doi.org/10.1144/petgeo2017-031
Claudio Turrini
CTGeolConsulting, 78100, St Germain-en-Laye, France
  • Find this author on Google Scholar
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  • Search for this author on this site
  • For correspondence: clturri@wanadoo.fr
Barbara Bosica
Petroceltic Italia, Via Ennio Quirino Visconti 20, Roma 00193, Italy
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Paul Ryan
Petroceltic International plc, 3 Grand Canal Plaza, Grand Canal Street Upper, Dublin 4, Ireland
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Peter Shiner
Petroceltic Italia, Via Ennio Quirino Visconti 20, Roma 00193, Italy
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Olivier Lacombe
Sorbonne Universités, UPMC Université Paris 06, CNRS, Institut des Sciences de la Terre de Paris (iSTeP), 4 place Jussieu, 75005 Paris, France
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François Roure
IFP-EN, 1 & 4 avenue de Bois-Préau 92852, Rueil-Malmaison, France Tectonic Group, Faculty of Geosciences, Department of Earth Sciences, Utrecht University, Budapestlaan 4, 3584 CD Utrecht, The Netherlands
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3D structural and thermal modelling of Mesozoic petroleum systems in the Po Valley Basin, northern Italy

Claudio Turrini, Barbara Bosica, Paul Ryan, Peter Shiner, Olivier Lacombe and François Roure
Petroleum Geoscience, 12 October 2017, https://doi.org/10.1144/petgeo2017-031
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