Fast static correction methods for high-frequency multichannel marine seismic reflection data: A high-resolution seismic study of channel-levee systems on the Bengal Fan

摘要: Very high-frequency marine multichannel seismic reflection data generated by small-volume air- or waterguns allow detailed, high-resolution studies of sedimentary structures the order one to few metres wavelength. The content, however, requires (1) a very exact knowledge source and receiver positions, (2) development processing methods which take this geometry into account. Static corrections are crucial for quality stacked because static shifts caused variations streamer depths half dominant wavelength, so that they can lead destructive interference during stacking CDP sorted traces. As common surface-consistent residual correction developed land require fixed shot locations two simple fast techniques have been with moving sources receivers correct such shifts. first method – called is based on simultaneous recording Parasound sediment echosounder data. It compares depth information derived from arrivals both sets calculate time each channel relative water depths. second average utilises fact mainly controlled bird units, keep in predefined at certain increments but do not prevent being slightly buoyant in-between. In case calm weather conditions these bendings contribute overall shifts, whereas negligible. Hence, mean calculated averaging values determined geophone group position several subsequent shots. Application survey channel-levee systems Bengal Fan shows section be improved significantly compared results achieved without preceding corrections. optimised records show features great detail, visible Limitations only result sea floor topography. generally provides more coherent reflections than applied areas rather flat floor, where no diffraction hyperbolae occur. contrast, also used regions rough morphology, coherency reduced method.