Detection of seismic signals using fiber optic distributed sensors
US9470807B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Nov 6, 2013 |
| Grant date | Oct 18, 2016 |
| Priority date | — |
| Expiry date | May 24, 2034 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01V1/40
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A fiber optic distributed vibration system for detecting seismic signals in an earth formation is provided. The system includes a fiber optic cable deployed in a borehole that extends into the earth formation and which is configured to react along its length to a seismic wave incident on the fiber optic cable from outside the borehole. An optical source launches an optical signal into the fiber optic cable while the seismic wave is incident thereon. A receiver detects coherent Rayleigh noise (CRN) produced in response to the optical signal. A processing circuit processes the detected CRN signal to determine characteristics of the earth formation.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.