海洋三维地震施工中横向舵鸟存在的问题与处理办法

Problems and Solutions of DigiFin in Marine 3D Seismic Construction

横向舵鸟(DigiFin)设备具有控制电缆横向间距、降低补线率等优点,在海洋三维地震采集施工中得到广泛使用.但在使用过程中会产生影响电缆等浮、尖啸等问题.该文结合舵鸟设备的组成及水下工作原理,针对在施工中舵鸟对电缆等浮影响、舵鸟挂载造成的电缆噪声、舵鸟尖啸故障(FSK Jamming)等实际问题展开分析,并提出相应的处理方案.通过及时更换电量较低、马达故障舵鸟;在水上端的仪器室内,及时断开仪器端DCXU声学线,同时禁止使用预判的故障舵鸟,通过上述方法能快速解决舵鸟产生的问题,减少舵鸟对施工效率、产品质量的影响,保障了海上施工的顺利进行.

DigiFin has the advantages of efficiently controlling the separation between streamers and reducing infill rate,and it has been widely used in the marine 3D seismic acquisition.However,problems affecting cable streamer and screaming will occur during operation.Based on acquaintance of DigiFin structure and its underwater working principle,this paper analyzes the actual issues such as DigiFin's influence on the streamer balance,streamer noise caused by DigiFin mounting,FSK Jamming and so on,and puts forward the corresponding treatment scheme.By replacing the Digifin with low power and motor failure in time,In the instrument room at the water end,disconnecting the dcxu acoustic line at the instrument end in time,and prohibiting the use of prejudged faulty Digifin.The above methods can quickly solve the problems caused by Digifin,reduce the impact of Digifin on construction efficiency and product quality,and ensure the smooth progress of offshore construction.