University of Cambridge > Talks.cam > BPI Seminar Series > Ed Hinton -Injection of a fluid into a confined aquifer with a vertical gradient of permeability. Alex Gutai - Formation and eruption of silicic magmas by crustal melting.

Ed Hinton -Injection of a fluid into a confined aquifer with a vertical gradient of permeability. Alex Gutai - Formation and eruption of silicic magmas by crustal melting.

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Ed Hinton -Injection of a fluid into a confined aquifer with a vertical gradient of permeability

We consider the flow of viscous fluid in a confined horizontal aquifer. The novel feature of the analysis is that we allow the permeability to vary vertically across the aquifer. We show that, depending on the magnitude of the permeability gradient across the formation, the structure of the front may involve shocks of constant shape, a spreading rarefaction type wave, or a mixture of the two. The classical solutions in a two-dimensional aquifer of constant permeability in which there is no viscosity ratio between the fluids lead to an interface which spreads laterally at a rate proportional to t^(1/2). However, these solutions are unstable to cross-layer variations in the permeability owing to the vertical shear which develops in the flow, causing the structure of the interface to evolve to the rarefaction wave or shock-like structure. We consider the implications of our results for the prediction of storage efficiency during CO2 sequestration.

Alex Gutai – Formation and eruption of silicic magmas by crustal melting.

An intrusion of hot mafic melt into continental crust may cause partial melting of the surrounding crust and formation of an overlying silicic magma body. This process has been modelled using idealised fluid dynamic and heat transfer arguments, building on the previous work of Huppert and Sparks (1988). Thermal and physical evolution of the system are modelled and processes such as overturn and/or mingling of magmas are predicted. This model has been applied in the context of the El Hoyazo eruption in SE Spain, using MELTS modelling to help constrain how the composition and physical properties of the magmas change with temperature. Current work involves analogue experiments to gain insight into roof melting, crystal sedimenting and magma mingling processes.

This talk is part of the BPI Seminar Series series.

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