Abstract
Using seismic geophones to get stratum information is a common method of petroleum geophysical exploration technology. Optical fibre distributed acoustic sensor (DAS) is one of the most advanced sound field detection technologies. It has most advantages of distributed continuous monitoring, such as deployment, high cost performance ratio, wide range measurement and so on. In this paper, a distributed acoustic sensing technology using interferometric demodulation is researched. Basic principal of the DAS, demodulation algorithm, and parameter test are introduced in detail. Ground geophysical prospecting test for petroleum is designed and carried out and a very clearly seismic section image is drawn out. DAS system performance and test data are discussed in detail. The research provides a new approach to petroleum geophysical prospecting using optical fiber sensor technology. Convenient, big coverage and large data make it potentially better suited for geophysical prospecting applications.
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