f Industrial and seismic noise removal in marine processing

3D marine surveys often take place in regions cluttered with oil rigs and sometimes other seismic vessels. The acoustic environment is therefore not very conducive to the acquisition of accurate seismic data. The oil rig may be in the process of drilling and there fore creating a great deal of vibration. It may have engines or noisy pumps. It may even read to the seismic arrival by diffracting part of the energy. The other seismic vessels may also be shooting. Numerous attempts have been made to demonstrate that these kinds of noise can be attenuated efficiently by methods based on the levels of amplitudes or on randomization of this noise within certain groups of traces. Apparently the concerns of the industry have not been allayed by these method sand, as a result, drilling and seismic acquisition must be planned on a regional scale (time-sparing), so that each activity respects the silence required by the other. In certain cases, this time-sparing is uneconomic and therefore impracticable.