Slip tendency analysis, fault reactivation potential and induced seismicity in the Val d'Agri oilfield (Italy)

2020 ◽  
Author(s):  
L. Vadacca ◽  
D. Rossi ◽  
A. Scotti ◽  
M. Buttinelli
Keyword(s):  
Induced Seismicity ◽  
Fault Reactivation ◽  
Slip Tendency ◽  
Tendency Analysis

Slip-tendency analysis and fault reactivation

Geology ◽  
1996 ◽  
Vol 24 (3) ◽  
pp. 275 ◽  
Author(s):  
Alan Morris ◽  
David A. Ferrill ◽  
D.Brent Brent Henderson
Keyword(s):  
Fault Reactivation ◽  
Slip Tendency ◽  
Tendency Analysis

scholarly journals Modelling fault reactivation with characteristic stress-drop terms

2019 ◽  
Vol 49 ◽  
pp. 1-7 ◽  
Author(s):  
Martin Beck ◽  
Holger Class
Keyword(s):  
Induced Seismicity ◽  
Shear Failure ◽  
Fault Reactivation ◽  
Mechanical Responses ◽  
Flow Processes ◽  
Failure Event ◽  
Characteristic Values ◽  
Shear Slip ◽  
Stress Drops ◽  
Characteristic Stress

Abstract. Predicting shear failure that leads to the reactivation of faults during the injection of fluids in the subsurface is difficult since it inherently involves an enormous complexity of flow processes interacting with geomechanics. However, understanding and predicting induced seismicity is of great importance. Various approaches to modelling shear failure have been suggested recently. They are all dependent on the prediction of the pressure and stress field, which requires the solution of partial differential equations for flow and for geomechanics. Given a pressure and corresponding mechanical responses, shear slip can be detected using a failure criterion. We propose using characteristic values for stress drops occurring in a failure event as sinks in the geomechanical equation. This approach is discussed in this article and illustrated with an example.

scholarly journals Induced seismicity in geologic carbon storage

Solid Earth ◽  
2019 ◽  
Vol 10 (3) ◽  
pp. 871-892 ◽  
Author(s):  
Víctor Vilarrasa ◽  
Jesus Carrera ◽  
Sebastià Olivella ◽  
Jonny Rutqvist ◽  
Lyesse Laloui
Keyword(s):  
Carbon Storage ◽  
Induced Seismicity ◽  
Public Perception ◽  
Fault Reactivation ◽  
Wellbore Stability ◽  
Rock Properties ◽  
Geologic Carbon Storage ◽  
Stress Changes ◽  
The Impact ◽  
Injection Formation

Abstract. Geologic carbon storage, as well as other geo-energy applications, such as geothermal energy, seasonal natural gas storage and subsurface energy storage imply fluid injection and/or extraction that causes changes in rock stress field and may induce (micro)seismicity. If felt, seismicity has a negative effect on public perception and may jeopardize wellbore stability and damage infrastructure. Thus, induced earthquakes should be minimized to successfully deploy geo-energies. However, numerous processes may trigger induced seismicity, which contribute to making it complex and translates into a limited forecast ability of current predictive models. We review the triggering mechanisms of induced seismicity. Specifically, we analyze (1) the impact of pore pressure evolution and the effect that properties of the injected fluid have on fracture and/or fault stability; (2) non-isothermal effects caused by the fact that the injected fluid usually reaches the injection formation at a lower temperature than that of the rock, inducing rock contraction, thermal stress reduction and stress redistribution around the cooled region; (3) local stress changes induced when low-permeability faults cross the injection formation, which may reduce their stability and eventually cause fault reactivation; (4) stress transfer caused by seismic or aseismic slip; and (5) geochemical effects, which may be especially relevant in carbonate-containing formations. We also review characterization techniques developed by the authors to reduce the uncertainty in rock properties and subsurface heterogeneity both for the screening of injection sites and for the operation of projects. Based on the review, we propose a methodology based on proper site characterization, monitoring and pressure management to minimize induced seismicity.

scholarly journals Coulomb Threshold Rate-and-State Model for Fault Reactivation: Application to induced seismicity at Groningen

2021 ◽  
Author(s):  
Elias Heimisson ◽  
Jonathan Smith ◽  
Jean-Philippe Avouac ◽  
Stephen Bourne
Keyword(s):  
Induced Seismicity ◽  
Fault Reactivation ◽  
State Model ◽  
Threshold Rate

scholarly journals Slip tendency analysis of major faults in Germany

2021 ◽  
Vol 1 ◽  
pp. 77-78
Author(s):  
Luisa Röckel ◽  
Steffen Ahlers ◽  
Sophia Morawietz ◽  
Birgit Müller ◽  
Karsten Reiter ◽  
...  
Keyword(s):  
Stress Field ◽  
Stress Tensor ◽  
Anthropogenic Activities ◽  
Friction Angle ◽  
Tectonic Activity ◽  
Normal Faults ◽  
Nuclear Waste Repository ◽  
Fault Surface ◽  
Slip Tendency ◽  
Tendency Analysis

Abstract. Natural seismicity and tectonic activity are important processes for the site-selection and for the long-term safety assessment of a nuclear waste repository, as they can influence the integrity of underground structures significantly. Therefore, it is crucial to gain insight into the reactivation potential of faults. The two key factors that control the reactivation potential are (a) the geometry and properties of the fault such as strike direction and friction angle, and (b) the orientations and magnitudes of the recent stress field and future changes to it due to exogenous processes such as glacial loading as well as anthropogenic activities in the subsurface. One measure of the reactivation potential of faults is the ratio of resolved shear stress to normal stresses at the fault surface, which is called slip tendency. However, the available information on fault properties and the stress field in Germany is sparse. Geomechanical numerical modelling can provide a prediction of the required 3D stress tensor in places without stress data. Here, we present slip tendency calculations on major faults based on a 3D geomechanical numerical model of Germany and adjacent regions of the SpannEnD project (Ahlers et al., 2021). Criteria for the selection of faults relevant to the scope of the SpannEnD project were identified and 55 faults within the model area were selected. For the selected faults, simplified geometries were created. For a subset of the selected faults, vertical profiles and seismic sections could be used to generate semi-realistic 3D fault geometries. Slip tendency calculations using the stress tensor from the SpannEnD model were performed for both 3D fault sets. The slip tendencies were calculated without factoring in pore pressure and cohesion, and were normalized to a coefficient of friction of 0.6. The resulting values range mainly between 0 and 1, with 6 % of values larger than 0.4. In general, the observed slip tendency is slightly higher for faults striking in the NW and NNE directions than for faults of other strikes. Normal faults show higher slip tendencies than reverse and strike slip faults for the majority of faults. Seismic events are generally in good agreement with the regions of elevated slip tendencies; however, not all seismicity can be explained through the slip tendency analysis.

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