BEGIN:VCALENDAR VERSION:2.0 PRODID:-//Talks.cam//talks.cam.ac.uk// X-WR-CALNAME:Talks.cam BEGIN:VEVENT SUMMARY:(De)compaction waves in porous viscoelastoplastic media and focuse d fluid flow - Viktoriya Yarushina (Institutt for energiteknikk — IFE) DTSTART:20160217T100000Z DTEND:20160217T110000Z UID:TALK64715@talks.cam.ac.uk CONTACT:INI IT DESCRIPTION:Co-authors: Yuri Podladchikov (Institut des Sciences de la Te rre\, University of Lausanne)\, Ludovic Raess (Institut des Sciences de l a Terre\, University of Lausanne)\, Nina Simon (Institute for Energy Tech nology)

Understanding of tectonic processes and melt tr ansport in the deep Earth and management of commercially valuable hydroca rbon resources and engineering operations such as CCS in the shallow Eart h are dependent on our knowledge about interaction between rocks and flui ds. Rock-fluid interaction involves heat and mass transfer\, deformation\ , hydrodynamic flow and chemical reactions\, thereby necessitating its co nsideration as a complex process coupling several simultaneous mechanisms . Two most widely used models for coupled fluid flow and rock deformation are poroelastic theory of Biot and poroviscous model of McKenzie. Even t hough many extensions of these two theories were proposed in recent years \, there is still a considerable effort directed towards formulation of n ew two-phase theories. Here\, we present a simple mathematical model for nonlinear porous viscoelastoplastic materials. Our main motivation is to establish a simple unifying theory for porous fluid flow in a deformable m atrix that is able to capture the range of rheological responses expected within the Earth. These responses can vary from elastic small strain con solidation to plastic porosity collapse from tenths to a few percents of porosity in near-surface sediments and up to high-temperature creep durin g extraction of melts and metamorphic fluids. Our model is thermodynamica lly consistent and can be generalized to the more complex multi-phase mul ti-component systems. Developed framework we apply to study focused fluid flow systems that are often evidenced as dikes\, veins or volcanic diatr emes in the deep Earth and fluid escape pipes\, gas conducting chimneys\, mud volcanoes\, sand injectites or pockmarks in the shallow Earth. The p articular attention is to porosity waves as a flow focusing mechanism. LOCATION:Seminar Room 1\, Newton Institute END:VEVENT END:VCALENDAR