LONG OFFSET LOW FREQUENCY SEISMIC SURVEYS USING OPTICAL FIBERS

Abstract: described herein is a method for performing a long offset refraction seismic survey of a subsurface area of interest using a fiber-optic cable () positioned on or under the earth's surface and extending between a first cable end () closer to the area of interest and a second cable end further from the area of interest, the method comprising: connecting an interrogator to an end of the fiber-optic cable, wherein the interrogator is configured to emit light into the cable through the end and detect reflected light from the cable; simultaneously steering and activating a low frequency seismic source and operating the interrogator to collect seismic refraction data; wherein steering the source comprises directing the source along a travel path that extends between a first source position closer to the area of interest and a second source position further from the area of interest, wherein the second source position is horizontally offset at least 9 km from the first cable end, and the cable and source travel path extend in opposite directions away from the area of interest, and processing the collected refraction data to build up an image of or extract information about the subsurface area of interest.

Inventor(s): Thomas ELBOTH, Kambiz IRANPOUR, Susann WIENECKE, Svein Arne FRIVIK, Jan Kristoffer BRENNE, Martin LANDRØ

CPC Classification: G01V1/226 (Transmitting seismic signals to recording or processing apparatus)

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