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Authors: Carcione, J.*
Da Col, F.*
Currenti, G.*
Cantucci, B.*
Title: Modeling techniques to study CO 2-injection induced micro-seismicity
Title of journal: International Journal of Greenhouse Gas Control
Series/Report no.: /42 (2015)
Publisher: Elsevier Science Limited
Issue Date: 2015
DOI: 10.1016/j.ijggc.2015.08.006
Keywords: CO 2 injection and monitoring
Fluid injection
Abstract: CO2 injection in saline aquifers is one solution to avoid the emission of this greenhouse gas to the atmosphere. This process induces a pore-pressure build-up around the borehole that generates tensile and shear micro-earthquakes which emit P and S waves if given pressure thresholds are exceeded. Here, we develop a simple model to simulate micro-seismicity in a layer saturated with brine, based on an analytical solution of pressure diffusion and an emission criterion for P and S waves. The model is based on poroelasticity and allows us to obtain estimations of the hydraulic diffusivity on the basis of the location of the micro-earthquakes (defining the CO2 plume) and the triggering time. Wave propagation of P and S waves is simulated with a full-wave solver, where each emission point is a source proportional to the difference of the pore pressure and the tensile and shear pressure thresholds. Finally a reverse-time migration algorithm is outlined to locate the asynchronous sources induced by the fluid flow, determinated by the maximum amplitude at each cell versus the back propagation time.
Appears in Collections:04.06.99. General or miscellaneous
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