research techniques using cords at different depths

摘要

research techniques using cords at different depths. The present invention relates to geophysical survey and data processing techniques using strands at different depths. in one embodiment, one method includes obtaining geophysical data that is specific to a geophysical formation and representative of: a particle motion signal recorded using sensors at first depth, a first pressure signal recorded using sensors towed at first depth, and a second pressure signal recorded using sensors towed to a second greater depth. In this embodiment, the method includes modifying a low frequency range of the particle motion signal using estimated particle motion information based on the second pressure signal. The modified particle motion signal can then be used to separate rising and falling wave fields. In some embodiments, geophysical data are obtained by towing a first strand at the first depth and a second strand at the second depth. In some embodiments, the second bead does not include particle motion sensors.