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.

Presentation Date: Monday, October 12, 2020

Session Start Time: 1:50 PM

Presentation Time: 3:55 PM

Location: 362C

Presentation Type: Oral

Keywords:
production monitoring, production control, reservoir characterization, vertical seismic profile, reservoir surveillance, upstream oil & gas, variation, production logging, das cable, exploration geophysicist 10
Subjects:
Well & Reservoir Surveillance and Monitoring, Reservoir Characterization, Non-Traditional Resources, Information Management and Systems, Production logging, Near-well and vertical seismic profiles, Seismic processing and interpretation, Geothermal resources
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2020. Society of Exploration Geophysicists
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