Monitoring spatiotemporal evolution of fractures during hydraulic stimulations at the first EGS collab testbed using anisotropic elastic-waveform inversion

Feng, Zongcai; Huang, Lianjie; Chi, Benxin; Gao, Kai; Li, Jiaxuan; Ajo-Franklin, Jonathan; Blankenship, Douglas A.; Kneafsey, Timothy J.

doi:10.1016/j.geothermics.2024.103076

Monitoring spatiotemporal evolution of fractures during hydraulic stimulations at the first EGS collab testbed using anisotropic elastic-waveform inversion

Journal Article · Tue Jun 18 00:00:00 EDT 2024 · Geothermics

DOI:https://doi.org/10.1016/j.geothermics.2024.103076· OSTI ID:2480478

Feng, Zongcai ^[1]; ^[1]; Chi, Benxin ^[1]; Gao, Kai ^[1]; Li, Jiaxuan ^[1]; Ajo-Franklin, Jonathan ^[2]; Blankenship, Douglas A. ^[3]; Kneafsey, Timothy J. ^[4]

Los Alamos National Laboratory (LANL), Los Alamos, NM (United States)
Rice Univ., Houston, TX (United States)
Sandia National Lab. (SNL-NM), Albuquerque, NM (United States)
Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States)

The EGS Collab project acquired continuous active-source seismic monitoring (CASSM) data before, during, and after hydraulic stimulations at the first testbed at the depth of 4850 ft (1478 m) at the Sanford Underground Research Facility in Lead, South Dakota, for monitoring fracture creation and evolution. CASSM acquisition was conducted using 24 hydrophones, 18 accelerometers, and 17 piezoelectric sources within four fracture-parallel wells and two orthogonal wells. 3D anisotropic traveltime tomography and anisotropic elastic-waveform inversion of the campaign cross-borehole seismic data show that the rock within the stimulation region is a heterogeneous horizontal transverse isotropic medium. Here we use these inversion results as the initial models and apply 3D anisotropic first-arrival traveltime tomography and 3D anisotropic elastic-waveform inversion to the CASSM data acquired after each stimulation in May, 2018 and December, 2018. We observe the spatiotemporal evolution of seismic velocities and anisotropic parameters caused by hydraulic fracture stimulations, showing the regions of rock alternation caused by hydraulic fracture stimulation.

View Accepted Manuscript (DOE)

Research Organization:: Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States)

Sponsoring Organization:: USDOE Office of Energy Efficiency and Renewable Energy (EERE), Renewable Power Office. Geothermal Technologies Office

Contributing Organization:: EGS Collab Team

Grant/Contract Number:: AC02-05CH11231

OSTI ID:: 2480478

Alternate ID(s):: OSTI ID: 2375574

Journal Information:: Geothermics, Journal Name: Geothermics Vol. 122; ISSN 0375-6505

Publisher:: ElsevierCopyright Statement

Country of Publication:: United States

Language:: English

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Monitoring spatiotemporal evolution of fractures during hydraulic stimulations at the first EGS collab testbed using anisotropic elastic-waveform inversion

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