Authors:

Erin Duell

Date Created:

Not specified

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About Paper:

A goal of geophysical monitoring of geothermal systems is to detect changes in the permeability of the network during shear stimulation. The Collab Project at the Sanford Underground Research Facility (SURF) in Lead, South Dakota performed continuous active-source seismic monitoring during an experiment to stimulate fractures at the 4100 foot level in the mine. The Collab data interpretation suggests that the fracture intersection angle varies along the intersection from 55 - 85 degrees. This raised the question of how intersections and intersection angles affect coda wave generation, i.e., late arriving energy composed of multiple internal reflections. This project aims to advance current understanding of the effect of intersecting fractures on coda wave generation. A replicate fracture system was fabricated from acrylic sheets in a water bath to create an impedance contrast that would give rise to multiple reflections. A water-coupled piezoelectric source transducer was placed at a fixed location (opposite or offset from the intersection) while the receiving transducer was translated to record coda waves at various locations. Data sets will be collected for different intersection angles, source locations and number of fractures to determine the impact on coda wave components. The results from the experiments will be presented on the poster, as data collection and analysis is currently underway. Keywords: Geophysics; Fractures; Wave Propagation; Laboratory Experimentation

Source:

Purdue University / 2024

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Co-authors:

Erin Duell