Publications of the Grimsel ISC Project

The experiments within the Grimsel "In-Situ Stimulation and Circulation (ISC)" project were completed in 2017. Once the processing and interpretation is finished, all data acquired as well as journal and conference contributions, reports and datasets will be made public and appear below. If you have questions related to ISC publications or data, please either contact the respective first authors or the project leader Dr. Joseph Doetsch.

Transmissivity Changes and Microseismicity Induced by Small-Scale Hydraulic Fracturing Tests in Crystalline Rock

Jalali, Mohammadreza; Gischig, Valentin; Doetsch, Joseph; Näf, Rico; Krietsch, Hannes; Klepikova, Maria; Amann, Florian; Giardini, Domenico

The seismo-hydro-mechanical behaviour during deep geothermal reservoir stimulations: open question tackled in a decameter-scale in-situ stimulation experiment

Amann, Florian; Gischig, Valentin; Evans, Keith; Doetsch, Joseph; Jalali, Reza; Valley, Benoît; Krietsch, Hannes; Dutler, Nathan; Villiger, Linus; Brixel, Bernard; Klepikova, Maria; Kittilä, Anniina; Madonna, Claudio; Wiemer, Stefan; Saar, Martin O.; Loew, Simon; Driesner, Thomas; Maurer, Hansruedi; Giardini, Domenico

Permeability and seismic velocity anisotropy across a ductile-brittle fault zone in crystalline rock

Wenning, Quinn C.; Madonna, Claudio; de Haller, Antoine; Burg, Jean-Pierre

On the link between fracture toughness, tensile strength, and fracture process zone in anisotropic rocks

Dutler, Nathan; Nejati, Morteza; Valley, Benoît; Amann, Florian; Molinari, Giulio

Subsurface fluid pressure and rock deformation monitoring using seismic velocity observations

Doetsch, Joseph; Gischig, Valentin S.; Villiger, Linus; Krietsch, Hannes; Nejati, Morteza; Amann, Florian; Jalali, Mohammadreza; Madonna, Claudio; Maurer, Hansruedi; Wiemer, Stefan; Driesner, Thomas; Giardini, Domenico

On the link between stress field and small-scale hydraulic fracture growth in anisotropic rock derived from microseismicity

Gischig, Valentin S.; Doetsch, Joseph; Maurer, Hansruedi; Krietsch, Hannes; Amann, Florian; Evans, Keith Frederick; Nejati, Morteza; Jalali, Mohammadreza; Valley, Benoît; Obermann, Anne Christine; Wiemer, Stefan; Giardini, Domenico

Active seismic monitoring of a hydraulic injection at the Grimsel Test Site

Doetsch, Joseph; Gischig, Valentin Samuel; Villiger, Linus; Krietsch, Hannes; Jalali, Mohammadreza; Amann, Florian

Data collection for the Grimsel In-Situ Stimulation and Circulation (ISC) experiment

Doetsch, Joseph; Gischig, Valentin; Amman, Florian; Jalali, Mohammadreza; Krietsch, Hannes; Giardini, Domenico

Microseismicity observed during hydraulic stimulations at the Grimsel Test Site

Villiger, Linus; Gischig, Valentin; Doetsch, Joseph; Krietsch, Hannes; Jalali, Mohammadreza; Dutler, Nathan; Amann, Florian

Comprehensive geological dataset for a fractured crystalline rock volume at the Grimsel Test Site

Krietsch, Hannes; Doetsch, Joseph; Dutler, Nathan; Jalali, Mohammadreza; Gischig, Valentin; Loew, Simon; Amann, Florian

Dataset for "Permeability and seismic velocity anisotropy across a ductile-brittle fault zone in crystalline rock"

Wenning, Quinn C.; Madonna, Claudio; de Haller, Antoine; Burg, Jean-Pierre

Hydraulic Characterization Data Collected Pre- and Post-hydraulic fracturing experiments for Stress Measurement at Grimsel Test Site

Jalali, Mohammadreza; Klepikova, Maria

Microseismicity observed during small-scale hydraulic fracturing experiments at the Grimsel Test Site

Gischig, Valentin; Doetsch, Joseph; Maurer, Hansruedi; Krietsch, Hannes; Amann, Florian; Evans, Keith Frederick; Jalali, Mohammadreza; Obermann, Anne Christine

An in-situ stimulation experiment in crystalline rock - seismo-hydro-mechanical response during hydraulic fracturing tests

Doetsch, J.; Amann, F.; Gischig, V.; Jalali, M.; Madonna, C.; Evans, K.; Valley, B.; Giardini, D.; Wiemer, S.; Maurer, H. R.

An Interdisciplinary Decameter-scale Reservoir Stimulation Practice at the Grimsel Test Site

Jalali, M.R.; Doetsch, J.; Gischig, V.; Madonna, C.; Amann, F.

A coupled fluid flow - seismicity model for real-time assessment of induced seismic hazard and reservoir creation

Gischig, Valentin; Doetsch, Joseph; Wiemer, Stefan

Reservoir Stimulation Experiments at the Grimsel Test Site: Stress Measurements using Hydraulic fracturing, Hydraulic Tests on Pre-existing Fractures and Overcoring

Doetsch, Joseph; Gischig, Valentin; Amann, Florian; Madonna, Claudio; Jalali, Mohammadreza; Valley, Benoit; Evans, Keith F.

Stress measurements in crystalline rock: Comparison of overcoring, hydraulic fracturing and induced seismicity results

Krietsch, Hannes; Gischig, Valentin; Jalali, M. Reza; Amann, Florian; Evans, Keith F.; Doetsch, Joseph; Valley, Benoit

Geophysical imaging and characterization of the DUG Lab at the Grimsel Test Site

Doetsch, Joseph; Gischig, Valentin; Maurer, Hansruedi

Characterization of the in-situ stress field at Grimsel Test Site

Krietsch, Hannes; Dutler, Nathan; Gischig, Valentin; Valley, Benoît; Evans, Keith F.; Amann, Florian

Permeability Enhancement in Enhanced Geothermal System as a result of Hydraulic Fracturing and Jacking

Jalali, Mohammadreza; Klepikova, Maria; Fisch, Hansruedi; Amann, Florian; Löw, Simon

Geothermal reservoir characterization through active thermal testing

Jung, Martin; Klepikova, Maria; Jalali, Mohammadreza; Fisch, Hansruedi; Löw, Simon; Amann, Florian

An in-situ stimulation experiment in crystalline rock – assessment of induced seismicity levels during stimulation and related hazard for nearby infrastructure

Gischig, Valentin; Broccardo, Marco; Amann, Florian; Jalali, Mohammadreza; Esposito, Simona; Krietsch, Hannes; Doetsch, Joseph; Madonna, Claudio; Wiemer, Stefan; Löw, Simon; Giardini, Domenico

Injection Protocol and First Results of Hydraulic Fracturing Experiments at the Grimsel Test Site

Dutler, Nathan; Valley, Benoît; Villiger, Linus; Krietsch, Hannes; Jalali, Mohammadreza; Gischig, Valentin; Doetsch, Joseph; Amann, Florian SCCER-SoE

The deformation field in a rock mass during an in-situ hydraulic stimulation experiment

Krietsch, Hannes; Gischig, Valentin; Doetsch, Joseph; Valley, Benoît; Amman, Florian

Mechanical response of a decameter-scale reservoir during an in-situ hydraulic stimulation experiment

Krietsch, Hannes; Gischig, Valentin; Doetsch, Joseph; Valley, Benoît; Amman, Florian

Observation of transient seismic velocity variations allow monitoring of field scale pressure changes during high-pressure fluid injection

Doetsch, Joseph; Gischig, Valentin; Villiger, Linus; Krietsch, Hannes; Amann, Florian; Jalali, Mohammadreza; Madonna, Claudio; Maurer, Hansruedi; Wiemer, Stefan; Giardini, Domenico

Pressure propagation during decameter-scale hydraulic stimulation experiments in crystalline rock at the Grimsel Test Site

Gischig, Valentin; Jalali, Mohammadreza; Doetsch, Joseph; Krietsch, Hannes; Villiger, Linus; Amann, Florian

Building a geological model for analysis and numerical modelling of hydraulic stimulation experiments

Krietsch, Hannes; Doetsch, Joseph; Gischig, Valentin; Jalali, Mohammadreza; Dutler, Nathan; Amann, Florian; Loew, Simon

Physical property characterization of a damage zone in granitic rock: Implications for geothermal reservoir properties

Wenning, Quinn; Madonna, Claudio; Amann, Florian; Gischig, Valentin; Burg, Jean-Pierre

Deformation and tilt measurements during the ISC experiment at the Grimsel Test Site

Krietsch, Hannes; Gischig, Valentin; Valley, Benoît; Amann, Florian SCCER-SoE

A Numerical Study on the Hydro - Mechanical Behavior of Conductive Fractures in the Deep Underground Rock Laboratory at the Grimsel Test Site

Jalali, Mohammadreza

Stress Characterisation and stress modeling at the Grimsel Test Site for the In-situ Stimulation and Circulation Project

Dutler, Nathan; Gischig, Valentin; Krietsch, Hannes; Amann, Florian; Valley, Benoît; Evans, Keith F.

Detecting induced seismicity on various scales: Monitoring the Grimsel injections

Gischig, Valentin; Doetsch, Joseph; Kraft, Toni; Maurer, Hansruedi; Wiemer, Stefan

Overview of the hydraulic stimulation experiments at the Grimsel Test Site

Doetsch, Joseph; Amann, Florian; Gischig, Valentin; Jalali, Reza; Krietsch, Hannes; Villiger, Linus; Evans, Keith F.; Valley, Benoît; Dutler, Nathan; Brixel, Bernard; Klepikova, Maria; Kittilä, Anniina; Wiemer, Stefan; Saar, Martin O.; Loew, Simon; Driesner, Thomas; Maurer, Hansruedi; Giardini, Domenico

A Multi-scale Approach toward understanding the Hydraulic Characteristics of the Stimulated Fractured Crystalline Rock

Jalali, Mohammadreza; Brixel, Bernard; Klepikova, Maria; Gischig, Valentin; Doetsch, Joseph; Amann, Florian

Modeling the Hydraulic Fracture Stimulation performed for Reservoir Permeability Enhancement at the Grimsel Test Site, Switzerland

Vogler, D.; Settgast, R.R.; Gischig, V. S.; Jalali, R.; Doetsch, J. A.; Valley, B.; Evans, K.F.; Sherman, C.; Amann, F.; Saar, M.O.

GPR imaging of shear zones in crystalline rock

Doetsch, Joseph; Krietsch, Hannes; Lajaunie, Myriam; Schmelzbach, Cedric; Maurer, Hansruedi; Amann, Florian

Micro-seismic monitoring during hydraulic-shearing experiments at the Grimsel underground laboratory

Villiger, Linus; Gischig, Valentin; Doetsch, Joseph; Dutler, Nathan; Krietsch, Hannes; Amann, Florian; Wiemer, Stefan

Induced micro-seismicity observed during meter-scale hydraulic-fracturing

Gischig, Valentin; Doetsch, Joseph; Krietsch, Hannes; Maurer, Hansruedi; Amann, Florian; Evans, Keith F.; Jalali, Mohammadreza; Obermann, Anne Christine; Nejati, Morteza; Valley, Benoît; Wiemer, Stefan

Flow path characterization using DNA-based smart tracers in the Grimsel Deep Underground Geothermal Laboratory (DUG-Lab)

Kittilä, Anniina; Keith, Evans; Deuber, Claudia; Saar, Martin O.

The use of novel DNA nanotracers to determine Groundwater flow paths - a test study at the Grimsel Deep Underground Geothermal (DUG) Laboratory in Switzerland

Kittilä, Anniina; Evans, Keith; Puddu, Michela; Mikutis, Gediminas; Grass, Robert N.; Deuber, Claudia; Saar, Martin O.

Results from combined characterization based on geological mapping and geophysics: Grimsel Test Site

Krietsch, Hannes; Doetsch, Joseph; Gischig, Valentin; Amann, Florian

Characterizing fractures and shear zones in crystalline rock using seismic and GPR methods

Doetsch, Joseph; Jordi, Claudio; Laaksonlaita, Niko; Gischig, Valentin; Schmelzbach, Cedric; Maurer, Hansruedi

Characterizing fractures and shear zones in crystalline rock using anisotropic seismic inversion and GPR imaging

Doetsch, Joseph; Krietsch, Hannes; Lajaunie, Myriam; Jordi, Claudio; Gischig, Valetin; Schmelzbach, Cédric; Maurer, Hansruedi

In-situ Stimulation and Circulation Experiment - Overview on Phase

Amann, Florian; Gischig, Valentin; Jalali, Mohammadreza; Doetsch, Joseph; Madonna, Claudio; Krietsch, Hannes; Evans, Keith Frederick; Valley, Benoît; Klepikova, Maria

A Multi-Scale Approach to Identify and Characterize Preferential Flow Paths in a Fractured Crystalline Rock

Jalali, Mohammadreza; Klepikova, Maria; Doetsch, Joseph; Krietsch, Hannes; Brixel, Bernard; Dutler, Nathan; Gischig, Valentin; Amann, Florian

A Comparison of FBG- and Brillouin-Strain Sensing in the Framework of a Decameter-Scale Hydraulic Stimulation Experiment

Krietsch, Hannes; Gischig, Valentin; Jalali, Mohammadreza; Doetsch, Joseph; Valley, Benoit; Amann, Florian

Identification and Characterization of Natural and Stimulation Induced Flow Path between two Boreholes using Conductivity Logs

Dutler, Nathan; Brixel, Bernard; Jalali, Mohammadreza; Kittilä, Anniina; Amann, Florian; Valley, Benoît

Petrophysical properties through a Grimsel granodiorite shear zone – Implications for geothermal reservoir evaluation and modeling

Wenning, Quinn C.; Madonna, Claudio; Moulas, Evangelos; Burg, Jean-Pierre

Fracture Transmissivity Development as a Response to Hydraulic Fracturing and Hydraulic Jacking at Grimsel Test Site

Loew, Simon; Jalali, Mohammadreza; Klepikova, Maria; Amann, Florian

Small-scale Reservoir Stimulation Experiments in the Deep Underground Laboratory at the Grimsel Test Site

Gischig, Valentin; Doetsch, Joseph; Jalali, Mohammadreza; Madonna, Claudio; Ammann, Florian

Preliminary stress characterization for an in-situ stimulation experiment at the Grimsel Underground Laboratory

Krietsch, Hannes; Doetsch, Joseph; Gischig, Valentin; Amann, Florian; Jalali, Mohammadreza; Madonna, Claudio; Evans, Keith; Valley, Benoît; Giardini, Domenico; Wiemer, Stefan; Maurer, Hansruedi; Löw, Simon

Modeling the Hydraulic Fracture Stimulation performed for Reservoir Permeability Enhancement at the Grimsel Test Site, Switzerland

Vogler, Daniel; Settgast, Randolph R.; Sherman, Christopher S.; Gischig, Valentin S.; Jalali, Reza; Doetsch, Joseph; Valley, Benoît; Evans, Keith F.; Amann, Florian; Saar, Martin O.

Modeling Induced Seismic Hazard During Geothermal Reservoir Creation

Doetsch, Joseph

On the variability of the seismic response during multiple decameter-scale hydraulic stimulations

Villiger, Linus; Selvadurai, Paul A.; Gischig, Valentin; Doetsch, Joseph; Krietsch, Hannes; Dutler, Nathan; Jalali, Mohammadreza; Valley, Benoît; Amann, Florian; Wiemer, Stefan

Mechanical, Hydraulic and Seismological Behaviour of Crystalline Rock as a Response to Hydraulic Fracturing at the Grimsel Test Site

Jalali, Reza; Gischig, V.; Doetsch, Joseph; Krietsch, Hannes; Amann, F.; Klepikova, Maria

Fully Hydro-Mechanically Coupled Experiments and Simulations on Rough Fractures Subjected to High-Pressure Fluid Injection

Vogler, Daniel; Settgast, Randolph R.; Annavarapu, Chandrasekhar; Madonna, Claudio; Bayer, Peter; Amann, Florian

The measurement of fracture toughness anisotropy in Grimsel Granodiorite using semi-circular samples

Dutler, Nathan; Nejati, Morteza; Amann, Florian; Valley, Benoît

DNA nanotracers characterization of stimulation enhanced pore in fractured rock

Kittilä, Anniina; Evans, Keith Frederick; Jalali, Mohammadreza; Willmann, Matthias; Saar, Martin O.

Tracer based characterization of the connected fracture volume in the DUG Lab at the Grimsel Test Site

Kittilä, Anniina; Evans, Keith; Jalali, Mohammadreza; Willmann, Matthias; Saar, Martin O.

Hydraulic Stimulation of Crystalline Rock – Grimsel Test Site

Jalali, Mohammadreza; Doetsch, Joseph; Gischig, Valentin; Krietsch, Hannes; Amann, Florian

Induced micro-seismicity observed during meter-scale hydraulic-fracturing

Gischig, Valetin; Doetsch, Joseph; Villiger, Linus; Krietsch, Hannes; Maurer, Hansruedi; Amann, Florian; Jalali, Mohammadreza; Obermann, Anne; Wiemer, Stefan

Observations of Fracture Propagation During Decameter-Scale Hydraulic Fracturing Experiments

Dutler, Nathan; Valley, Benoît; Gischig, Valentin; Jalali, Mohammadreza; Doetsch, Joseph; Krietsch, Hannes; Villiger, Linus; Amann, Florian

Injection Protocol and First Results of Hydraulic Fracturing Experiments at the Grimsel Test Site

Dutler, Nathan; Valley, Benoît; Villiger, Linus; Krietsch, Hannes; Jalali, Mohammadreza; Gischig, Valentin; Doetsch, Joseph; Amann, Florian

Monitoring salt tracer transport in granite rock using ground penetrating radar reflection imaging

Giertzuch, Peter-Lasse; Doetsch, Joseph; Kittilä, Anniina; Jalali, Reza; Schmelzbach, Cédric; Maurer, Hansruedi; Shakas, Alexis

Background

The Grimsel ISC project (Demo-1) has been performed between 2014 and 2017 at the Grimsel Test Site by an interdisciplinary team of ETH Zurich and the University of Neuchâtel.

The primary goal is to improve our understanding of geomechanical processes underpinning permeability creation during hydraulic stimulation and related induced seismicity as well as to evaluate the efficiency of the generated underground heat exchanger.

Two hydraulic injection phases were executed to enhance the permeability of the rock mass. They were monitored at a high spatial and temporal resolution, including the following characteristics: rock mass deformation across fractures and within intact rock, pore pressure distribution and propagation as well as micro-seismic response.

A review of scientific research that addresses seismo-hydro-mechanical coupled processes relevant for the development of a sustainable heat exchanger in low permeability crystalline rock and an introduction to the ISC experiments has been published by Amann et al., 2018.