A New Mechanism for Upper Crustal Fluid Flow Driven by Solitary Porosity Waves in Rigid Reactive Media?

Chakraborty, Sumit

doi:10.1002/2017gl075798

Cited by 9 publications

(3 citation statements)

References 37 publications

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“…Another issue is a scaling problem: porosity waves are expected to occur and evolve at scales (meters to kilometers) that do not lend themselves easily to high‐pressure and elevated temperature laboratory experimentation (scales of millimeters to centimeters) under conditions at which the rock and its constituents deform in a viscous or plastic manner. The latter is a prerequisite for modeling (Chakraborty, ). Our preliminary results (Räss et al, ) and the data presented here show that high‐permeabile pathways are most likely to form in low‐permeable clay‐rich materials and that these pathways can be observed at laboratory timescales (weeks to months).…”

Section: Discussionmentioning

confidence: 99%

Experimental Poroviscoelasticity of Common Sedimentary Rocks

Makhnenko

Podladchikov

2018

JGR Solid Earth

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The success of geoenergy applications such as petroleum recovery or geological storage of CO2 depends on properly addressing the physical coupling between the pore fluid diffusion and mechanical deformation of the subsurface rock. Constitutive models should include short‐term hydromechanical interactions and long‐term behavior and should incorporate the principles behind the mathematical models for poroelastic and poroviscoelastic responses. However, the viscous parameters in constitutive relationships still need to be validated and estimated. In this work, we experimentally quantify the time‐dependent response of fluid‐filled sedimentary rocks at room temperature and isotropic stress states. Drained, undrained, and unjacketed geomechanical tests are performed to measure the poroelastic parameters for Berea sandstone, Apulian limestone, clay‐rich material, and Opalinus clay (shale). A poroviscous model parameter, the bulk viscosity, is included in the constitutive relationships. The bulk viscosity is estimated under constant isotropic stress conditions from time‐dependent deformation of rock in the drained regime for timescales ~105 s and from observations of the pore pressure growth under undrained conditions at timescales of ~104 s. The bulk viscosity is on the order of 1015–1016 Pa s for sandstone, limestone, and shale and ~1013 Pa s for clay‐rich material, and it decreases with an increase in pore pressure despite a corresponding decrease in the effective stress. In the long term, fluid pressure can asymptotically approach minimum principal stress, which in natural reservoirs may lead to liquefaction or rock embrittlement, causing slip instabilities and earthquakes and creating high‐permeability channels in low‐permeable rock.

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Section: Discussionmentioning

confidence: 99%

Experimental Poroviscoelasticity of Common Sedimentary Rocks

Makhnenko

Podladchikov

2018

JGR Solid Earth

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“…The application of decompaction weakening (e.g., Connolly & Podladchikov, 1998 and the consideration of viscous shear deformation of the solid (Räss et al, 2019) enables a significant channelization of porosity waves for two-and three-dimensional (2D and 3D) flow. Furthermore, Omlin et al (2017) show that the coupling of the kinetics of chemical reactions with fluid flow may enable porosity waves also to potentially arise in low-temperature regimes, so that the porosity waves are not necessarily limited to the high-temperature viscous regions (Chakraborty, 2017). Moreover, Jordan et al (2018) show that mass, and hence melt, can be transported in 2D and 3D porosity waves; a fact that has been doubted based on 1D porosity wave studies.…”

Section: 1029/2021gc009963mentioning

confidence: 99%

Melt Migration and Chemical Differentiation by Reactive Porosity Waves

Bessat

Pilet

Podladchikov

et al. 2022

Geochem Geophys Geosyst

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The different geodynamic settings with magmatism observed around the world, such as mid-ocean ridges (MORs), volcanic arcs and intraplate volcanism, indicate that asthenospheric melts are extracted under significantly distinct pressure, temperature and rheological conditions (Figure 1a). The main difference between melt extraction at intraplate settings and at MORs is the presence of the lithospheric mantle for the intraplate settings. The geochemical signature of MOR basalt (MORB) presumably depends on magma source composition, melt-extraction and differentiation processes intervening between the magma source and the crust (e.g., Langmuir et al., 1992). MORBs are produced and migrate in the asthenosphere and temperature (T) and pressure (P) variations are,

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“…A key question pertaining to the fluid-assisted formation of the Maiolica breccia is the origin of the hydrothermal fluids for hydraulic fracturing. Recent studies showed that expulsion of fluids from the plastic zone by sudden increases in porosity and permeability can form channelized fluid flows at velocities much greater than the background flow rate determined by Darcy's Law (Connolly and Podladchikov, 2015;Chakraborty, 2017;Jordan et al, 2018). The rapid fluid flow is also found to be associated with high fluid pressure close to lithostatic pressure.…”

Section: Model Of Maiolica Breccia Formationmentioning

confidence: 99%

Fluid-assisted brecciation of Lower Cretaceous Maiolica limestone in the Umbria-Marche Apennines: Hydrodynamical implications

Chan

Álvarez

Geiser

et al. 2022

From the Guajira Desert to the Apennines, and From Mediterranean Microplates to the Mexican Killer Asteroid: Honoring the Caree

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The formation of the “expansion breccia” observed in the Lower Cretaceous Maiolica limestone in the Umbria-Marches region of Italy is attributable to a fluid-assisted brecciation process that occurred during the late Miocene exhumation of the Northern Apennines. The hydrothermal fluids probably originated as brine solutions trapped in the Burano anhydrite while it was in a plastic state. The migration of the Burano from the plastic to the brittle domain during unroofing resulted in liberation and injection of over-pressured hydrothermal fluids into the overlying limestone, causing hydraulic fracturing. Mapping of breccia morphology along a 400-m transect showed structures produced by different flow regimes, with chaotic and mosaic breccia characterizing the core parts of the section and mineral-filled fractures and veins in the margins. Based on the clast size in the chaotic breccia, the estimated velocities for fluidizing the aggregates of clasts and sustaining the clasts in suspension are, respectively, 15 cm/s and 65 cm/s. Crack growth was probably the main mechanism for the fragmentation of the limestone. Explosion fracturing patterns were only sporadically observed in the breccia, indicating substantial heat loss of the over-pressured fluids during their ascent to the Earth’s surface.

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A New Mechanism for Upper Crustal Fluid Flow Driven by Solitary Porosity Waves in Rigid Reactive Media?

Cited by 9 publications

References 37 publications

Experimental Poroviscoelasticity of Common Sedimentary Rocks

Experimental Poroviscoelasticity of Common Sedimentary Rocks

Melt Migration and Chemical Differentiation by Reactive Porosity Waves

Fluid-assisted brecciation of Lower Cretaceous Maiolica limestone in the Umbria-Marche Apennines: Hydrodynamical implications

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