Effects of progressive burial on matrix porosity and permeability of dolostones in the foreland basin of the Alpine Orogen, Switzerland

Aschwanden, Lukas; Diamond, Larryn W.; Adams, Arthur

doi:10.1016/j.marpetgeo.2018.10.055

Cited by 21 publications

(5 citation statements)

References 20 publications

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“…other hydrochemical indicators (particularly high 40 Ar/ 36 Ar and He contents) led Biehler et al [22] and Waber et al [21] to suggest that such waters near Baden (i.e., in the area of Riniken; Figure 1(a)) may have ascended into the Muschelkalk along faults from the underlying crystalline basement. Numerous faults that link the basement with the Muschelkalk or that even rise up through the overlying Jurassic and Cretaceous sediments are documented in the region by seismic surveys [15,23,24].…”

Section: Geofluidsmentioning

confidence: 99%

“…Oxygen isotope ratios of porefilling quartz and kaolinite, as well as hydrogen isotopes of kaolinite, were analysed by conventional bulk techniques at several laboratories: the Scottish Universities Environmental Research Centre (SUERC) in East Kilbride; the Department of Geosciences, University of Lorraine; and the Institute of Earth Surface Dynamics, University of Lausanne (methods described by Sharp [26], Fallick et al [27], Kasemann et al [28], Tarantola et al [29], Jourdan [36]. The dissolution of anhydrite nodules was found to have increased bulk porosity by up to 15 vol.…”

Section: Isotope Investigationsmentioning

confidence: 99%

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Creation of Secondary Porosity in Dolostones by Upwelling Basement Water in the Foreland of the Alpine Orogen

et al. 2019

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Creation of secondary dissolution porosity in carbonate rocks during deep burial has the potential to improve reservoir properties for hydrocarbons, gas storage, and geothermal applications. However, the occurrence and mechanisms of such porosity enhancement are controversial. Here, we present compelling evidence for generation of deep burial porosity from the Swiss Molasse Basin, where dissolution of eogenetic anhydrite nodules in dolostones of the Middle Triassic Muschelkalk increased the matrix porosity by up to 15 vol.%. We reconstruct the genesis and evolution of the anhydrite-dissolution porosity based on petrography, porosity determinations, analyses of stable and radiogenic isotopes (δ2H, δ18O, δ34S, and 87Sr/86Sr), fluid inclusion studies, and laser U–Pb geochronology of secondary calcite. The results show that modified meteoric waters derived from the Variscan crystalline basement ascended via basement–cover cross-formational faults into the overlying Muschelkalk, where they dissolved the anhydrite nodules throughout an area of at least 55 km2 at 700–2300 m depth and 40–160°C. Secondary calcite in anhydrite moulds yields Late Eocene to Middle Miocene U–Pb ages, which coincide with the timing of basement uplift in the foreland bulge of the Swiss Alpine Orogen. This uplift provided the hydraulic gradients to drive meteoric water deep into the adjacent Molasse basin. Similar enhancement of reservoir properties can be expected in dolostones in other foreland basins that are bordered by a foreland bulge in which fractured basement rocks are exhumed.

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Section: Geofluidsmentioning

confidence: 99%

Section: Isotope Investigationsmentioning

confidence: 99%

Creation of Secondary Porosity in Dolostones by Upwelling Basement Water in the Foreland of the Alpine Orogen

et al. 2019

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“…Further to the east, this formation is also present at various depths in the Swiss Molasse Basin (Figures 3 and 5). Opalinus Clay is a laterally continuous, lithologically homogeneous formation with a regionally comparable diagenetic evolution (Figure 5A) [22,27]. Mazurek et al [22] used data from apatite fission track analysis, vitrinite reflectance, and biomarker isomerization to constrain peak burial temperatures from boreholes.…”

Section: Geological Setting and Samplingmentioning

confidence: 99%

A Magnetic Geothermometer in Moderately Buried Shales

et al. 2021

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Shales contain magnetic minerals generally at very low concentrations. In the early stages of diagenesis, the inherited magnetic minerals are altered, while magnetic nanominerals are formed. In this study, we proposed a study of shales over a stratigraphic thickness of 1.3 km from a borehole in the Paris basin (Borehole EST 433, France), and shales from the same formation (Opalinus Clay) collected in seven boreholes in the Jura molasse basin (Swiss). Magnetic measurements at experimental temperatures <30 K allowed the formation of a proxy of magnetite nanograins named PM. We showed that some of these nanograins formed around the pyrite grains, probably under the action of temperature and organic matter. PM was then compared to the maturity values of the organic matter. We found a correlation between PM and the percentage of reflectance of vitrinite. The shales from both Paris and molassic Swiss basins showed very comparable magnetic characteristics for a given maturity level. The magnetic study therefore provided constraints on the maturity level of the shales in the oil window area. Our study showed that PM can be used as a geothermometer in shales in which CaCO3 is lower than 60%.

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“…The particle size of the debris is 0.02-0.05 mm; the mineral structure is granular, flaky and tabular; the particle size of the filler is 0.05 mm; the mineral structure is granular, bladed and elongated; the porosity is 0.86%. tests have been conducted to estimate the effect of burial depth on the physical and mechanical properties of rock [17][18][19][20]. The residual stress and peak deviatoric stress, as well as the corresponding axial strain and volumetric strain, increase with the increase of confining pressure and burial depth.…”

Section: Experimental Materials and Proceduresmentioning

confidence: 99%

“…• d= dd can be obtained by solving the plastic consistency condition (Equation (19)) and damage criterion (Equation (20)).…”

Section: Formulation Of Elastoplastic Damage Coupling Modelmentioning

confidence: 99%

Mechanical Behavior of Coupled Elastoplastic Damage of Clastic Sandstone of Different Burial Depths

Wang

Zhang

2020

Energies

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Clastic sandstone is widely distributed in oil and gas reservoirs; its internal structure has many micro-defects. Under different stress environments of burial depth, significant damage evolution and plastic deformation easily occur. A series of triaxial compression tests were performed to study the coupled elastoplastic damage mechanical behavior of clastic sandstone samples at different burial depths ranging from 581.28 m to 979.82 m. Results reveal that the stress-strain responses of clastic sandstone samples exhibit significant nonlinear and softening characteristics. The mechanical behavior is due to the coupling of plastic deformation and mechanical damage. Plastic and damage internal variables cause damage stiffness degradation and plastic flow. Considering the coupling of elastoplastic damage in the loading process, an elastoplastic damage coupling model is proposed to study the mechanical behavior of different burial depth clastic sandstones. The model can effectively describe the mechanical behavior of clastic sandstone, such as the volume compression and dilatancy transformation, plastic hardening and damage softening, which are in good agreement with the experimental results. Furthermore, the mechanical behavior of the clastic sandstone shows a dependency on the confining pressure and burial depth. The load-bearing capacity and the ability to resist deformation of the clastic sandstone are improved as the confining pressure and burial depth increase. Relevant results can provide reliable basis for the safe exploitation of oil and gas engineering.

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Effects of progressive burial on matrix porosity and permeability of dolostones in the foreland basin of the Alpine Orogen, Switzerland

Cited by 21 publications

References 20 publications

Creation of Secondary Porosity in Dolostones by Upwelling Basement Water in the Foreland of the Alpine Orogen

Creation of Secondary Porosity in Dolostones by Upwelling Basement Water in the Foreland of the Alpine Orogen

A Magnetic Geothermometer in Moderately Buried Shales

Mechanical Behavior of Coupled Elastoplastic Damage of Clastic Sandstone of Different Burial Depths

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