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Workshop description

Pressure changes in the reservoir, being caused either by sudden effects of hydraulic fracturing or by a long term pressure depletion, can result in broadly felt induced seismicity. The detailed relationship between pressure changes and felt seismicity is not always understood. Assessing the risk requires monitoring schemes with a diversity of technologies including the assessment of subsidence, fault mapping and - in general - the understanding of the causes of induced felt seismicity.

In this workshop, we want to bring together geophysicists, reservoir and geomechanical engineers and scientists, as well as earthquake seismologists to explore theories, diagnostic methods and prediction methodology in the field of production induced seismicity. Our interest is on case studies, methods for monitoring reservoir (e.g. seismic, InSAR, 4D seismic, permanent monitoring), and linking these to geomechanical behavior as well as to theoretical and practical developments, which may be of interest in this field.
 

Workshop objectives and set-up

The key objective of this workshop is to give those involved in industry and academia the opportunity to share and discuss recent advances in the study of induced seismicity.
To achieve this objective, the workshop has a set-up roughly similar to the set-up of a scientific paper: One part in which the problem is raised and described, one part describing the state of the art and recent work, and then one part where avenues to the future are laid out, ending with conclusions (and debate).

There are four sessions:

  • A. Observations on the landscape. Measurement technologies are available and being used (with progress being made on accuracy and precision), while regulatory bodies are pressing for action to reduce and mitigate risks of production and injection induced seismicity. Within these two boundaries, physical understanding and interpretations are yet not fully clear.
  • B. Geomechanical analysis. While uncertainties persist, geomechanical analysis methods have been the cornerstone of our understanding of injection and production induced seismicity. A number of techniques have been applied in the past, and new methods are developing to discriminate natural seismicity from production induced seismicity.
  • C. Measurement and mitigation. With increasing understanding, new techniques are being developed to predict seismicity, which may be more widely applicable.
  • D. Conclusion. In order to bring all material of the workshop together, all speakers of the day join in a panel to discuss outstanding issues, the way forward and so to come to conclusions.

The workshop offers ample opportunity for discussions.
 

Programme

Session Observations on the Landscape
09:30 Introduction to the workshop and its objectives
09:45

WS07-A01 Some History - Injection Induced versus Depletion Induced

F.B. Kets* (University of Leeds) & L. Eisner (Czech Academy of Sciences)

09:55

WS07-A02 Analysis and Interpretation of Induced Micro-seismicity by Flooding of the Gardanne Coal Basin (Provence – Southern France)

E. Matrullo* (INERIS), I. Contrucci (INERIS), P. Dominique (BRGM - Bureau de Recherches Géologiques et Minière), M. Bennani (INERIS), H. Aochi (BRGM - Bureau de Recherches Géologiques et Minière), J. Kinsher (INERIS), P. Bernard (IPGP - Institut de Physique du Globe de Paris) & P. Bigarré (INERIS)

10:20

WS07-A03 Induced Seismicity in Underground Gas Storage - The Case of Castor, Offshore NE Spain

R. del Potro* (Geostock Iberia) & M. Diez (University of Bristol)

10:45

WS07-A04 Cross-correlation - An Objective Tool to Indicate Induced Seismicity

L. Eisner* (Czech Academy of Sciences) & I. Oprsal (Seismik s.r.o.)

11:00 Discussion session
11:25 Coffee break
Session Geomechanical Analysis
11:40

WS07-B01 Production-induced Fault Reactivation and Seismicity in The Netherlands - From Quick Scan to 3D Geomechanical Modelling

B.B.T. Wassing* (TNO), L. Buijze (TNO), P. Fokker (TNO), B. Orlic (TNO), K. Van Thienen-Visser (TNO) & J.D. van Wees (TNO)

12:05

WS07-B02 Case Studies of Depletion Induced Seismicity Using Rate & State Modeling for Probabilistic Discrimination and Hazard

T. Dahm* (GFZ German Research Centre for Geosciences), S. Cesca (GFZ) & S. Hainzl (GFZ)

12:30 Discussion session
12:55 Lunch break
Session Measurement and Mitigation
13:55

WS07-C01 InSAR for Induced Seismicity Monitoring 

A.R. Rucci* (TRE), A.F. Ferretti (TRE) & A.T. Tamburini (TRE)

14:20

WS07-C02 Geomechanical Assessment of Seismic Potential from Hydraulic Fracturing 

S.C. Maxwell* (IMaGE), F. Zhang (IMaGE) & B. Damjanac (IMaGE)

14:45

WS07-C03 Real Time Forecasting of Maximum Expected Induced Seismicity

J.P. Verdon* (University of Bristol), M.J. Werner (University of Bristol), A.L. Stork (University of Bristol) & J.M. Kendall (University of Bristol)

15:10 Discussion session
15:35 Coffee break
Session Conclusions
15:50 Introduction to the speaker forum & Report on earlier workshops on induced seismicity
16:00 Speaker forum - Wrap up and debate
16:50 Closing