Investigation of the time-lapse changes with the DAS borehole data at the Brady geothermal field using deconvolution interferometry
Name
segam2020-3426023.1.pdf
Description
Published version
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3.37 MB
Format
Adobe PDF
Checksum (MD5)
7fe675415f23ff728bcca822f1ff79ee
Author(s)
Chang, Hilary
Nakata, Nori
Date Issued
September 30, 2020
Journal
SEG Technical Program Expanded Abstracts 2020
Publisher
Society of Exploration Geophysicists
Citation
Hilary Chang, Nori Nakata; September 1, 2020. "Investigation of the time-lapse changes with the DAS borehole data at the Brady geothermal field using deconvolution interferometry." Proceedings of the SEG Technical Program Expanded Abstracts 2020. SEG Technical Program Expanded Abstracts 2020. (pp. pp. 3417-3421). ASME.
Version
Final published version
Abstract
The distributed acoustic sensor (DAS) has great potential for monitoring natural-resource reservoirs. In this study, we investigate the DAS borehole data at the Brady geothermal field. We analyze the seismic velocity perturbations of the waves propagating along the borehole during an eight-day period and analyze the velocity variations across depth, time, temperature, and pressure. The results suggest that this reverberation is caused by poor coupling between the cable and the well-casing, and the reverberations provide useful information to measure the time-lapse changes of the observation system and potentially the surrounded structure. This type of signal can occur when the cable is not fixed to the well-casing even with good cement condition.
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DOI of Published Version
https://doi.org/10.1190/segam2020-3426023.1
