At the end of 2002, permanent fiber-optic sensors were first used to carry out seismic recordings on the Izaute gas storage field. This successful experiment illustrates the potential applications of this technology; these include measurement of pressure, constraints, temperature, and seismic that can be used in such applications as microseismic monitoring and multiphase metering.

Fiber optics as sensors have numerous advantages—reliability at high pressure and over a very wide range of temperatures, signal unaffected by outside disturbances, compactness, even when an array of sensors are included. These sensors are also capable of repeat measurements such as those needed for reservoir...

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