EGS Collab Experiment 1: SIMFIP Notch-164 GRL Paper

Abstract

Characterizing the stimulation mode of a fracture is critical to assess the hydraulic efficiency and the seismic risk related to deep fluid manipulations. We have monitored the three-dimensional displacements of a fluid-driven fracture during water injections in a borehole at ~1.5 km depth in the crystalline rock of the Sanford Underground Research Facility (USA). The fracture initiates at 61% of the minimum horizontal stress by micro-shearing of the borehole on a foliation plane. As the fluid pressure increases further, borehole axial and radial displacements increase with injection time highlighting the opening and sliding of a new hydrofracture growing ~10 m away from the borehole, in accordance with the ambient normal stress regime and in alignment with the microseismicity. Our study reveals how fluid-driven fracture stimulation can be facilitated by a mixed-mode process controlled by the complex hydromechanical evolution of the growing fracture.

The data presented in this submission refer to the SIMFIP measurements and analyses of the stimulation tests conducted on the 164 ft (50 m) notch of the Sanford Underground Research Facility (SURF), during the EGS-Collab test 1. In addition to the datafiles, there is the draft of a manuscript submitted to Geophysical Research Letters (GRL).

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Additional Info

DOE Project Name: EGS Collab
DOE Project Number: EE0032708
DOE Project Lead: Lauren Boyd
DOI: 10.15121/1737366
Last Updated: 30 days ago
Sep
2020
Data from September, 2020
Submitted Sep 24, 2020

Contact

Lawrence Berkeley National Laboratory


510.486.7626

Status

Publicly accessible License 

Authors

Yves Guglielmi
Lawrence Berkeley National Laboratory

Keywords

geothermal, energy, SIMFIP, New borehole instrument, hydrofracture, EGS Collab, nucleate, anisotropy, shear displacement, wellbore, experiment, stimulation, seismic, seismicity, fracture, hydraulic conductivity, stress, shear, borehole, micro-shearing, foliation, injection test, Sanford Underground Research Facility, SURF, EGS, hydraulic, geophysics, displacement, flow rate

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