Laboratory testing of low frequency strain measured by distributed acoustic sensing
- Matthew W. Becker (California State University Long Beach) | Christopher Ciervo (California State University Long Beach) | Thomas Coleman (Silixa LLC)
- Document ID
- Society of Exploration Geophysicists
- 2018 SEG International Exposition and Annual Meeting, 14-19 October, Anaheim, California, USA
- Publication Date
- Document Type
- Conference Paper
- 2018. Society of Exploration Geophysicists
- DAS (distributed acoustic sensors), Fiber-optic sensors, Fractures
- 2 in the last 30 days
- 64 since 2007
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Recent field experiments have demonstrated that distributed acoustic sensing (DAS) can be used to record strain in fiber optic cable at mHz frequencies. However, the effect of fiber optic cable construction on strain transfer has not been evaluated. The laboratory experiments presented here were designed to mimic fiber optic cable cemented into a borehole that intersects bedrock fractures. Hydraulic stress on the fracture is expected to stretch the cemented borehole which can be sensed by DAS. In the laboratory, we cemented five different fiber optic cable constructions into a pipe and then strained the pipe periodically using stepper motors. Strain was measured with DAS. The magnitude of strain measured by DAS varied by about a factor of two. These results are very preliminary, but demonstrate the importance of cable construction on the interpretation of low-frequency strain measurements
Presentation Date: Wednesday, October 17, 2018
Start Time: 1:50:00 PM
Location: 212A (Anaheim Convention Center)
Presentation Type: Oral
|File Size||336 KB||Number of Pages||4|
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