地震反射波CDP叠加技术在海域花岗岩孤石探测中的应用

台山核电站取水隧洞海域部分采用盾构法施工,在盾构掘进前,应尽可能地探查清楚掘进区域的大直径球状风化物的赋存情况,尤其是直径大于1m的孤石,以便尽早采取措施进行清除或制定穿越该处的方案。本文介绍了海域地震反射波多次覆盖CDP叠加技术,阐述了海上单道地震与CDP叠加技术的差别,从方法原理、震源选择、观测系统等方面分析了探测小尺寸异常体的关键技术,通过钻探验证了该技术在探测风化残留体中孤石的良好效果。

Marine Seismic Reflection for the Detection of the Weathering Residues in the Granite

Shield excavation method is adopted for the marine intake tunnel project of the Taishan nuclear power.Before the excavation,it is necessary to ensure the distribution of weathered granite residual in the tunnel,especially boulder with diameter larger than 1m,so that construction plan can be established as soon as possible.The thesis introduces the multichannel CDP stack technique in marine seismic reflection,explains the difference of the CDP stack method to the single-channel seismic method,analyzes the ke...