Abstract:Influenced by current, tide, cable,etc., the final position of submarine cable or node geophone would drift from the designed position in offshore seismic survey, so that it is necessary to determine the exact position of the receiver point on the seabed through secondary positioning. A first-break positioning method, namely a vector superposition method, is proposed in this paper. The exact coordinates of the receiver point can be obtained by constructing the vector of each source-receiver pair and vector superposition. And integrating with the quantitative evaluation index of positioning accuracy, we get a positioning method involving first break picking, positioning calculation and posi-tioning accuracy evaluation. Applications to raw data have proved that the method can provide accurate secondary positioning results of submarine cable or node geophone, and quantitatively evaluate the positioning accuracy. It has a wide application in marine seismic survey.
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