| 摘要 |
FIELD: physics.SUBSTANCE: disclosed is a skeg that is mounted from the stern of a towing vessel and extends below the waterline. A channel in the skeg protects cables for steamers and a source of a seismic system deployed from the vessel. Tow points on the skeg lie below the water surface and connect to tow lines to support the steamers and source. A floatation device supports the source and tows below the water surface to avoid ice floes. The streamers can have vehicles deployed thereon for controlling a position on the streamer. To facilitate locating the streamers, these vehicles on the streamers can be brought to the surface when clear of ice floes so that GPS readings can be obtained and communicated to a control system. After obtaining readings, the vehicles can be floated back under the surface. When deploying, using and selecting the system in an icy region, ice at the surface is taken into account. In addition, noise generated by ice impact events is taken into account when handling the seismic record.EFFECT: high quality of seismic survey.41 cl, 68 dwg |
