Nicolas Beaudoin, Olivier Lacombe, Nicolas Bellahsen, Khalid Amrouch, and Jean-Marc
Danie

Amrouch, K.

Beaudoin, N.

Bellahsen, N.

Daniel, J.-M.

Lacombe, O.

Adelaide Research &amp; Scholarship

PUBLISHED VERSION   Nicolas Beaudoin, Olivier Lacombe, Nicolas Bellahsen, Khalid Amrouch, and Jean-Marc Daniel Fluid pressure evolution in overpressured limestone reservoir at basin-scale: example of the Bighorn Basin (Wyoming, USA) and lessons from comparison with other reservoirs Geophysical Research Abstracts, 2014 / vol.16, pp.3497   © Author(s) 2014. CC Attribution 3.0 License              http://hdl.handle.net/2440/92216             http://hdl.handle.net/2440/92298  PERMISSIONS https://creativecommons.org/licenses/by/3.0/au/   Date viewed 14 June, 2015       Geophysical Research AbstractsVol. 16, EGU2014-3497, 2014EGU General Assembly 2014© Author(s) 2014. CC Attribution 3.0 License.Fluid pressure evolution in overpressured limestone reservoir atbasin-scale: example of the Bighorn Basin (Wyoming, USA) and lessonsfrom comparison with other reservoirsNicolas Beaudoin (1,2,3), Olivier Lacombe (2,3), Nicolas Bellahsen (2,3), Khalid Amrouch (4), and Jean-MarcDaniel (5)(1) University of Glasgow, School of Geographical and Earth Sciences, Glasgow, United Kingdom(nicolas.beaudoin@glasgow.ac.uk), (2) UPMC Univ Paris 06, UMR 7193, ISTEP, F-75005, Paris, France, (3) CNRS, UMR7193, F-75005, Paris, France, (4) Australian School of Petroleum, Centre for Tectonics, Resources and Exploration (TRaX),University of Adelaide, North Terrace, Adelaide, SA 5005, Australia, (5) Geology Geochemistry Geophysics Direction, IFPEnergies Nouvelles, Rueil-Malmaison, FranceIn many natural cases, an hydrostatic gradient prevails in strata, and some oil-producing basins are the locationof underpressured reservoirs. This contribution presents the fluid paleo-(over)pressure evolution in a carbonatereservoir, reconstructed using a paleo-stress dataset and novel methodology. The case study of the Madison-Phosphoria reservoir (Bighorn Basin, Wyoming, USA) is an interesting example to assess the problem of the fluidoverpressure evolution in deforming media. Indeed it proposes among the first paleo-overpressure reconstructionin strata regarding both burial and subsequent compressional deformation. Results point out that in the BighornBasin, supra-hydrostatic pressure values prevail in the Madison-Phosphoria reservoir during most of its wholeSevier-Laramide history, except during the stage of Sevier foreland flexure/forebulge. At the basin-scale, theevolution of fluid overpressure can easily be related to large-scale fluid migrations characterized independentlyusing geochemistry of vein-filling cements.We propose a comparison of the reconstructed fluid overpressure values with in situ measurements in vari-ous overpressured reservoirs in other oil-producing basins with respect to burial depth. The comparison withnatural pressure data measured in several basins suggests the existence of a mean gradient of overpressure level incarbonates, and the pressure values reconstructed in vertical veins that accommodated the layer-parallel shorteningrespect this mean gradient. Strikingly, the fluid overpressure measured or recorded in porous media like sandstonesare systematically beyond this mean gradient, as are the fluid pressure values related to extensional stress regimes.On the opposite, when the stress regime become compressional, we observe that fluid pressure is above the meangradient, illustrating that during orogenic stress build-up, the supra-hydrostatic fluid pressure may gradually reachand exceed the lithostatic value, marked by the development of reverse faults and horizontal veins parallel tobedding.Thus, the difference between this mean gradient and the reconstructed pressure values may be related tothree main parameters: the lithology and the vertical permeability of fractures (i.e. the mechanical stratigraphy),and the local stress regime. The hydraulic permeability related to mechanical stratigraphy and/or to stress regimeseems to impact more the fluid pressure level than the chemical compaction related to hydrocarbon generation, orto differential compaction related to sedimentation rates.

Fluid pressure evolution in overpressured limestone reservoir at basin-scale: example of the Bighorn Basin (Wyoming, USA) and lessons from comparison with other reservoirs

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Fluid pressure evolution in overpressured limestone reservoir at basin-scale: example of the Bighorn Basin (Wyoming, USA) and lessons from comparison with other reservoirs

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Fluid pressure evolution in overpressured limestone reservoir at basin-scale: example of the Bighorn Basin (Wyoming, USA) and lessons from comparison with other reservoirs

Abstract

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Adelaide Research &amp; Scholarship

Adelaide Research & Scholarship