Evaluating Micro-Seismic Events Triggered by Reservoir Operations at the Geothermal Site of Groß Schönebeck (Germany)

Blöcher, Guido; Cacace, Mauro; Jacquey, Antoine B.; Zang, Arno; Heidbach, Oliver; Hofmann, Hannes; Kluge, Christian; Zimmermann, Günter

doi:10.1007/s00603-018-1521-2

Cited by 36 publications

(23 citation statements)

References 47 publications

(56 reference statements)

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“…The maximum fluid pressure should be maintained below the critical effective stress state for fault activation. This can be estimated from slip tendency analysis of nearby faults (e.g., Blöcher et al 2018). If the confidence on in situ stress state and fault geometries is low, it is recommended to apply the lowest possible pressures that lead to a stimulation effect and to avoid excessive overpressures.…”

Section: Low Pressuresmentioning

confidence: 99%

Cyclic soft stimulation (CSS): a new fluid injection protocol and traffic light system to mitigate seismic risks of hydraulic stimulation treatments

et al. 2018

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Economic production of a variety of geological resources, such as shale gas, tight oil, coal bed methane and geothermal heat using enhanced geothermal systems (EGS), relies on hydraulic stimulation treatments. These are reservoir enhancement methods where fluid is injected into a reservoir to increase its productivity by a combination of developing new tensile and shear fractures, and tensile opening and shearing of pre-existing fractures. Stimulated fractures may stay open naturally through the self-propping effect or they have to be kept open artificially by proppants, such as sands or ceramics that are injected together with the stimulation fluid to achieve a permanent productivity enhancement. Details about hydraulic fracturing and other reservoir stimulation methods can be found in an abundance of textbooks and other publications (e.g., Bunger et al. 2013; Economides and Nolte 2000; Economides and Martin 2007; Huenges and Ledru 2010). While improving the hydraulic reservoir performance, hydraulic stimulation treatments also cause fluid-injection-induced seismicity. On the one hand, induced seismicity

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Section: Low Pressuresmentioning

confidence: 99%

Cyclic soft stimulation (CSS): a new fluid injection protocol and traffic light system to mitigate seismic risks of hydraulic stimulation treatments

et al. 2018

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“…Break the core and recover it to the surface sufficient for the stress magnitude determination if (1) the rock is homogeneous and linearly viscoelastic, (2) the viscoelasticity of the rock can be characterized by one viscoelastic parameter, (3) Poisson's ratio is not time-dependent, (4) the in situ stresses are removed instantaneously. In case of transversely isotropic cores, at least one additional viscoelastic parameter is required (Blanton 1983).…”

Section: Tests On Core Samples In Laboratorymentioning

confidence: 99%

“…Other examples of induced seismicity that affected commercial activities are the stoppage of gas production in the Groningen field (NOS: Nederlandse Omroep Stichting 2019) and repeated stoppages of hydraulic fracture stimulation conducted for shale gas production near Blackpool in the United Kingdom (Clarke et al 2014;Hicks et al 2019). In terms of mitigating these kinds of induced hazards, knowledge of 3-D stress state is required to estimate how far it is from a given failure criterion (Blöcher et al 2018;Morris et al 1996). The distance between the stress state and failure indicates how much stress changes are permitted due to induced or natural processes before reactivation of pre-existing faults or creation of new fractures occurs (Morris et al 1996;Schoenball et al 2018;Walsh and Zoback 2016).…”

Section: Introductionmentioning

confidence: 99%

An open-access stress magnitude database for Germany and adjacent regions

Morawietz

Heidbach

Reiter³

et al. 2020

Geotherm Energy

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Knowledge of the crustal stress state is important for the assessment of subsurface stability. In particular, stress magnitudes are essential for the calibration of geomechanical models that estimate a continuous description of the 3-D stress field from pointwise and incomplete stress data. Well established is the World Stress Map Project, a global and publicly available database for stress orientations, but for stress magnitude data only local data collections are available. Herein, we present the first comprehensive and open-access stress magnitude database for Germany and adjacent regions, consisting of 568 data records. In addition, we introduce a quality ranking scheme for stress magnitude data for the first time.

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“…Uncontrollable subsurface parameters include the initial state of stress and pore pressure, size and density of pre-existing faults/fractures, fault/fracture orientation and shear strength, and other geomechanics parameters [55]. Figure 5 shows the effect of the pressure increase on the fault reactivation in the deep doublet geothermal Groß Schönebeck project in the North German Basin, where fluid-injection-induced seismicity is recorded [56]. The stress state at the injection depth of 4035 m is a normal faulting regime with S v = 100 MPa, S Hmax = 98 MPa, S hmin = 55 MPa, and P p = 43 MPa [56].…”

Section: δSmentioning

confidence: 99%

Well-Doublets: A First-Order Assessment of Geothermal SedHeat Systems

Mahbaz

Yaghoubi

Sarvaramini³

et al. 2021

Applied Sciences

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Renewable and sustainable energy sources can play an important role in meeting the world’s energy needs and also in addressing environmental challenges such as global warming and climate change. Geothermal well-doublet systems can produce both electrical and thermal energy through extracting heat from hot-water aquifers. In this paper, we examine some potential challenges associated with the operation of well-doublet systems, including heat conductivity, chemical, and mechanical issues. In these systems, geomechanics issues such as thermal short-circuiting and induced seismicity arise from temperature and pressure change impacts on the stress state in stiff rocks and fluid flow in fractured rock masses. Coupled chemical processes also can cause fluid channeling or formation and tubular goods plugging (scaling) with precipitates. Mechanical and chemical disequilibrium conditions lead to increased production uncertainties; hence risk, and therefore coupled geo-risk assessments and optimization analyses are needed for comparative commercialization evaluations among different sites. The challenges related to heat transfer processes are also examined. These studies can help better understand the issues that may arise during the operation of geothermal well-doublet systems and improve their effectiveness, subsequently reducing associated costs and risks.

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Evaluating Micro-Seismic Events Triggered by Reservoir Operations at the Geothermal Site of Groß Schönebeck (Germany)

Abstract: Rock Mechanics and Rock Engineering manuscript No.

Cited by 36 publications

References 47 publications

Cyclic soft stimulation (CSS): a new fluid injection protocol and traffic light system to mitigate seismic risks of hydraulic stimulation treatments

Cyclic soft stimulation (CSS): a new fluid injection protocol and traffic light system to mitigate seismic risks of hydraulic stimulation treatments

An open-access stress magnitude database for Germany and adjacent regions

Well-Doublets: A First-Order Assessment of Geothermal SedHeat Systems

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