Integrated solutions to low signal-to-noise ratio OBC dual-sensor seismic data processing

Geophones in Ocean Bottom Cables (OBC) acquisition are not easily coupled with the sea floor because of the influence of ocean current, seafloor topography and operation method. As a result, geophone data frequently have low signal-to-noise ratios (S/N), which seriously affects the dual-sensor summation processing and greatly hinders the success of Ocean Bottom Cable acquisition technology. Geophone data-coupling correction technique constrained by hydrophone data is used to solve the coupling problem of geophone data. A self-adaptive noise removal technique based on hydrophone and geophone data-matching is used to improve the S/N of the geophone data with an effort to maintain the amplitude relationship between hydrophone and geophone data. A root-mean-square amplitude ratio weighted hydrophone and geophone summation technique is used to improve the summation effect of low S/N for OBC data. The test results demonstrate that our methods are appropriate to solve low S/N OBC dual-sensor summations.