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10/14/2013

Fiber-Optic Seismic Monitoring

Source:  Dan Hawkes

Fibr_optic_daley
Figure 1. Flatpack with DAS cable photo (a) and schematic (b). Note that the geophone tubing encapsulated conductor (TEC) cable was deployed separately from the flatback. (c) Flatpack and walllocking geophone clamped on tubing.
Distributed acoustic sensing (DAS) is a relatively new development in the use of fiber-optic cable for measurement of ground motion. Discrete fiber-optic sensors have been in research and development and field testing for more than 15 years, with geophysical applications at least 12 years old. ESD’s Tom Daley recently led a group of researchers (including ESD’s Barry Freifeld, Jonathan Ajo-Franklin, and Shan Dou) in a series of field tests examining the application of this methodology to borehole and surface measurements, focusing on the DAS data collected and the initial results from each test. Taken together, these tests, which were all part of CO2 storage monitoring pilots, demonstrated many potential applications of DAS technology, as well as some current limitations in sensitivity compared with conventional geophone recording.

 

To read further, go to: http://tle.geoscienceworld.org/content/32/6/699.full.pdf+html

Citation: Daley, T.M., B.M. Freifeld, J. Ajo-Franklin, S. Dou, R. Pevzner, V. Shulakova, S. Kashikar, D.E. Miller, J. Goetz, J. Henninges, and S. Lueth (2013), Field testing of fiber-optic distributed acoustic sensing (DAS) for subsurface seismic monitoring. The Leading Edge, 32 (6), 699-706; DOI:10.1190/tle32060699.1

Funding: FE, SECARB, GEO-SEQ, NETL, CO2 Capture Project (CCP)