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Speaker: Giorgos Papageorgiou, University of Edinburgh

Recent experimental work has highlighted the problems associated with understanding seismic signatures of CO2 injection scenarios. The physical properties of supercritical CO2 are very sensitive to pressure and temperature. Unlike conventional scenarios, the principal difference between the background and injected fluid is often the viscosity. Pore-scale distribution of the fluids is complex with two seismic properties sensitive to permeability changes and fluid pressure. We argue that traditional workflows based on fluid systems with a strong bulk modulus contrast and where the fluids have been mixed over geological timescales are poorly suited to this injection scenario. We introduce a novel set of practical tools which have been tested on laboratory data and which can be used to support CO2 monitoring. The importance of the work is illustrated through consideration of "tuning analysis" of thin attenuating CO2 layers.

Speaker Biography: Giorgos Papageorgiou, University of Edinburgh
Giorgos Papageorgiou has a background in theoretical physics with a PhD in mathematical physics from Heriot-Watt University. He first became interested in geophysics in 2011 where he worked as a postdoctoral researcher on seismic amplitude versus offset classification of subglacial sediments and its potential to determine the ice-bed boundary condition. He has since worked on rock physics modelling of partially saturated CO2 rocks with a short stint in Trondheim  (NTNU) where he worked on seismic modelling of anisotropic, partially saturated thin layers and their effects in seismic wave propagation before returning to the University of Edinburgh to work on Seismic Rock Physics as a research associate where he is currently based.
His interests span theoretical rock physics, numerical modelling, rock-physics based seismic inversion, fluid substitution and wave propagation in layered media.

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