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Numerical investigation of hydraulic stimulation and related induced seismicity in Pohang fractured geothermal reservoir, South Korea

Authors
/persons/resource/farkas

Farkas,  Marton Pal
2.6 Seismic Hazard and Risk Dynamics, 2.0 Geophysics, Departments, GFZ Publication Database, Deutsches GeoForschungsZentrum;

/persons/resource/hannes

Hofmann,  Hannes
4.8 Geoenergy, 4.0 Geosystems, Departments, GFZ Publication Database, Deutsches GeoForschungsZentrum;

/persons/resource/zimm

Zimmermann,  G.
4.8 Geoenergy, 4.0 Geosystems, Departments, GFZ Publication Database, Deutsches GeoForschungsZentrum;

/persons/resource/zang

Zang,  A.
2.6 Seismic Hazard and Risk Dynamics, 2.0 Geophysics, Departments, GFZ Publication Database, Deutsches GeoForschungsZentrum;

Bethmann,  Falko
External Organizations;

Meier,  Peter
External Organizations;

External Ressource

https://doi.org/10.2312/GFZ.4.8.2019.017
(Supplementary material)

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Citation

Farkas, M. P., Hofmann, H., Zimmermann, G., Zang, A., Bethmann, F., Meier, P. (2019): Numerical investigation of hydraulic stimulation and related induced seismicity in Pohang fractured geothermal reservoir, South Korea - Abstracts, 13th EURO-Conference on Rock Physics and Geomechanics (Potsdam 2019).


Cite as: https://gfzpublic.gfz-potsdam.de/pubman/item/item_4651901
Abstract
In this study, we investigate numerically the hydro-mechanical behaviour of fractured crystalline rock due to hydraulic stimulations at the Pohang Enhanced Geothermal site in South Korea. Several hydraulic stimulations were performed in wells PX-1 and PX-2. Based on the well test analysis of these stimulations the fracturing mechanism is associated with hydro-shearing in well PX-1. We use the commercial code FracMan (Golder Associates) that enables studying dynamic hydro-mechanical coupled processes in fractured media in three dimensions combining the finite element method with a discrete fracture network. The software is used to simulate fluid pressure perturbation and related stress redistribution at fractures during hydraulic stimulation in PX-1. This can be combined with critical stress analysis on fracture surface to derive location and magnitude of microseismic events. The calibrated reservoir model allows different injection strategies to be tested. Ahead of future field applications, this methodology may be applied at other sites to optimize stimulation strategies, if sufficient data are available.