Abstract：For seismic data collected by ocean bottom cable (OBC) in shallow water area, key processing techniques such as first-break based second positioning, and dual-sensor (hydrophone and geophone) data summation are widely used. First-break based second positioning is mainly applied to solve the position deviating problem of OBC which happened during the process of cable drop from sea surface to seabed. Usually, this problem is occurred due to ocean current. Based on known source positions, we can accurately determine OBC receiver positions with the relation among first break time, speed of ocean current, and offset. Dual-sensor data summation is used to eliminate ghost and ringing on seismic records. According to the scalar property of piezoelectric detector (hydrophone) and the vector property of velocity detector (geophone), the ratio of seismic wave pressure-to-velocity is calculated with wavefield separation and Gauss-Seidel iteration. Seismic data collected by dual sensors is summated based on the calculated optimum ratio.
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