Discussion on Induced Seismicity
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1 Discussion on Induced Seismicity Michael Manga & Antonio P. Rinaldi 4 th Cargèse Summer School: Flow and Transport in Porous and Fractured Media Cargèse, Corsica (France),
2 On the maximum magnitude of induced event PAW=Pawnee, M max =5.8 BAS=Basel, M max =3.4 CAR=Cardston, M max = 3 GFS=In-Situ experiment, aseismic McGarr & Barbour, 2018
3 The case of Pohang, South Korea Grigoli et al., 2018
4 The case of Pohang, South Korea Two papers recently published on Science raised the questions on caon earthquake being induced/triggered by injection activity. The European paper Grigoli et al. Independent analysis of seismicity from regional network and InSAR ground uplift. Complex source mechanism Analysis of Coulomb Failure Stress shows that little changes can be attribute to recent (one year before) seismicity The Korean paper Kim et al. Analysis of aftershocks using local network Correlate net injected volume with seismicity
5 The case of Pohang InSAR modeling Grigoli et al., 2018
6 The case of Pohang regional network seismicity Grigoli et al., 2018
7 The case of Pohang Coulomb Failure Stress Grigoli et al., 2018
8 The case of Pohang local network seismicity Kim et al., 2018
9 The case of Pohang injection activity and seismicity Kim et al., 2018
10 On the maximum magnitude of induced event PAW=Pawnee, M max =5.8 BAS=Basel, M max =3.4 CAR=Cardston, M max = 3 GFS=In-Situ experiment, aseismic Pohang, M max =5.4(5.5) McGarr & Barbour, 2018
11 St. Gallen Deep Geothermal System project timeline 2009 Feasibility study for geothermal project D seismic survey 270 km 2 (Heuberger et al., 2016) 2012 SED starts seismic monitoring 2013 Mar-Jul: Borehole drilling Jul: Stimulation of Malm inducing ML 3.5 earthquake Sep-Oct: Fishing for lost equipment and mud losses Oct: Production test (seismicity ceased) since Nov: shut-in of well 2014 May: Geothermal project suspended 22 November, , Stadt St.Gallen / St.Galler Stadtwerke
12 The case of St. Gallen DGS July 2013 injection test 14 July Injection test (175 m 3 ) Time Catalog of located events - Diehl et al., 2017 Pressures and injection rates - Wolfgramm (GTN), 2014
13 The case of St. Gallen DGS July 2013 acid jobs 14 July Injection test (175 m 3 ) 17 July Acid stimulations (290 m 3 ) Time Catalog of located events - Diehl et al., 2017 Pressures and injection rates - Wolfgramm (GTN), 2014
14 The case of St. Gallen DGS July 2013 gas kick and well control 12:00 gas kick 14 July Injection test (175 m 3 ) 17 July Acid stimulations (290 m 3 ) 19/20 July Gas kick and well control measures (700 m 3 ) Time Catalog of located events - Diehl et al., 2017 Pressures and injection rates - Wolfgramm (GTN), 2014
15 The case of St. Gallen DGS July 2013 gas kick and well control 12:00 gas kick 15:00 well control 14 July Injection test (175 m 3 ) 17 July Acid stimulations (290 m 3 ) 19/20 July Gas kick and well control measures (700 m 3 ) Time Catalog of located events - Diehl et al., 2017 Pressures and injection rates - Wolfgramm (GTN), 2014
16 The case of St. Gallen DGS July 2013 gas kick and well control 12:00 gas kick 15:00 well control 05:30 ML 3.5 induced 14 July Injection test (175 m 3 ) 17 July Acid stimulations (290 m 3 ) 19/20 July Gas kick and well control measures (700 m 3 ) Time Catalog of located events - Diehl et al., 2017 Pressures and injection rates - Wolfgramm (GTN), 2014
17 The case of St. Gallen DGS Spatial distribution of seismicity Diehl et al., 2017
18 The case of St. Gallen DGS Temporal evolution of seismicity Stimulation period July 2013 Time Catalog of located events - Diehl et al., 2017 Pressures - Wolfgramm (GTN), 2014
19 The case St. Gallen DGS The conceptual model Injection test (14 July) induces minor seismicity and opens up fractures 14 July Injection test (175 m 3 ) Time
20 The case of St. Gallen DGS The conceptual model Acid stimulations (17 July) induce further seismicity and increase fracture permeability so that gas can migrate upwards 14 July Injection test (175 m 3 ) July Acid stimulations and gas kick Time
21 The case of St. Gallen DGS The conceptual model Well control measures (700 m 3 injected) induces main sequence 14 July Injection test July Acid stimulations and gas kick Time 20 July Well control measures
22 On the maximum magnitude of induced event PAW=Pawnee, M max =5.8 BAS=Basel, M max =3.4 CAR=Cardston, M max = 3 GFS=In-Situ experiment, aseismic Pohang, M max =5.4(5.5) St. Gallen, M max =3.5 McGarr & Barbour, 2018
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