A fibre optic multi-component ocean bottom seismic system, for permanent installations, has been developed and pilot test data from the system have been acquired and subject to analysis. The cable system contains high reliability fibre optic three-axis (3C) accelerometers and hydrophones, fiber Bragg grating (FBG) based sensor network and an electro-optic interrogation and read-out system for the sensors. The sensors, fiber network, in-sea components and the topside instrumentation system have been subjected to significant qualification programs. The results of analysis of the data from the pilot tests confirms the systems high degree of vector fidelity, high signal-to-noise ratio, very good ground-station coupling, reliability and excellent response in general to wave modes in connection with ocean-bottom seismic. Fibre optic sensor technology, for applications within permanently buried seismic acquisition systems, is viable and is now introduced to the industry. These systems can potentially be very valuable tools for the oil companies in their work for optimization of hydrocarbon recovery and production throughout the life of a field.
展开▼
