海上地震采集减少潮流影响的方法研究

Method of Reducing the Influence of Tidal Current on Offshore Seismic Data Acquisition

海上地震采集作业中潮流的影响主要表现在影响海底电缆的铺放、海底电缆在海底位置的移动、拖缆的羽角大小及变化、拖缆采集的面元匹配、海底电缆、拖缆采集资料的信噪比等。通过研究潮流对地震采集作业的影响机制和规律，渤海海域地震采集作业中的实际应用，展示了多种控制潮流影响的方法和手段，通过在电缆上配置横向控制器能够将补线率降低5％-10％。实践证明，这些方法的综合利用能够大幅减少潮流对地震采集的影响，提高地震资料的品质。

The influences of tidal current on the offshore seismic data acquisition are mainly： influencing the laying of submarine ca- bles, the change of the submarine cable position, the size and the change of the cable-pulling feathering angle, the surface-element matching in cable-pulling acquisition, the signal to noise ratio in the cable and cable-pulling acquisition, etc. The methods and the means for controlling the influences of the tidal current on the offshore seismic data acquisition are demonstrated through the research of the influence mechanism and law of the tide on the seismic acquisition, and the practical application of the research result in the Bohai sea area. The supplementing ratio of the cable can be reduced by 5%-10% through using the horizontal controller on the cable.