1887

Abstract

Summary

Distributed Acoustic Sensing (DAS) is an innovative technique which has been recently employed for near-surface geophysics purposes. It involves the analysis of a fibre-optic cable by sending a laser pulse from an interrogator unit. The phase of the backscattered signal contains the information of the strain on the cable, enabling the detection of a passing seismic wave. Allowing the interrogation of long profiles and the generation of a dense spatial sampling, uneasy to obtain with classic techniques, DAS instrumentation proved its relevance for seismic applications. DAS measurements rely on the estimation of the difference in the phase of the studied backscattered light between two positions on the fibre. The distance separating those two positions is called gauge length.

Because the signal to noise ratio values obtained with DAS appear generally low when compared with values acquired with geophones, it is required to know the optimal gauge length value to use in order to obtain the best data quality.

In this paper, the impact of gauge length variations on DAS data quality is explored on the same set of data acquired during a well-to-well seismic survey along a fibre-optic cable running in four different monitoring wells.

Loading

Article metrics loading...

/content/papers/10.3997/2214-4609.202011724
2020-12-08
2024-03-28
Loading full text...

Full text loading...

References

  1. Sladen, A., Rivet, D., Ampuero, J. P., De Barros, L., Hello, Y., Calbris, G. and Lamare, P.
    [2019] Distributed sensing of earthquake and ocean-solid Earth interactions on seafloor telecom cables, Nature Communications
    [Google Scholar]
  2. Dean, T., Hartog, A., Cuny, T. and Englich, F.
    [2016] The effects of pulse width on fibre-optic distributed vibration sensing data.78th EAGE Conference & Exhibition, Vienna, Austria.
    [Google Scholar]
  3. Dean, T., Tertyshnikov, K., Pevzner, R., Calbris, G., Jestin, C. and Lanticq, V.
    [2019] Experimental Measurement of the Effects of Acquisition Parameters on DAS Data Quality, 81st EAGE Conference & Exhibition, London, UK
    [Google Scholar]
http://instance.metastore.ingenta.com/content/papers/10.3997/2214-4609.202011724
Loading
/content/papers/10.3997/2214-4609.202011724
Loading

Data & Media loading...

This is a required field
Please enter a valid email address
Approval was a Success
Invalid data
An Error Occurred
Approval was partially successful, following selected items could not be processed due to error