三维地震勘探双船作业中炮船的应用

在三维地震勘探中,有时工区内会有平台、礁石、小岛等障碍,使用双船作业(Undershooting)是获得该障碍区域优良地震资料的一个好方法。根据三维地震勘探原理,只要在勘探面积上获得分布均匀的地下数据点,且具有足够的覆盖次数;检波器网格的大小满足空间采样定理,则三维地震勘探的数据采集就可以满足要求。所以海上的地震电缆(检波点)就可以绕过障碍区而获得足够的地下三维数据。阐述了双船作业的方法原理,就炮船(Source vessel)震源与导航系统的配置,以及近场检波器的安装方法作了详细说明。在实践中,应用该方法使炮船取得了很好的作业效果。

APPLYING SOURCE VESSEL TO UNDERSHOOTING IN3-D MARINE SEISMIC SURVEY

During the process of acquiring 3-D seismic data, there wil be platform, reef or small island in the work area sometimes.Undershooting is a good way to acquire the data of that obsta cle. By principle of acquiring 3-D seismic data, it is acceptabl to get enough data of underground in the explore surface if thdata with enough coverage and the gridnet of geophone is satified the 3-D sampling principle. The principle of undershootin and the configurations of source and navigation system and in stallation of near field hydrophone of source vessel have been explained. In practice, source vessel with this way has gotten excellent effect.