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http://hdl.handle.net/2122/10266
Authors: | Carcione, J.* Da Col, F.* Currenti, G.* Cantucci, B.* |
Title: | Modeling techniques to study CO 2-injection induced micro-seismicity | 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 Micro-seismicity |
Subject Classification: | 04. Solid Earth::04.06. Seismology::04.06.99. General or miscellaneous | 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: | Article published / in press |
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File | Description | Size | Format | Existing users please Login |
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Carcione et al IJGGC 2015.pdf | 2.55 MB | Adobe PDF | ||
Carcione et al 2015-MS.pdf | Open access | 3.31 MB | Adobe PDF | View/Open |
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