地震映像法在某跨海大桥水上勘查中的应用

采用地震映像法对某海湾进行了海上勘测,目的是查明轴线处水深界面、岩面埋深、起伏及构造带情况。在建立反射波运动学数学模型基础上,通过解平面波波动方程,对偏移距的选择进行了探讨。并对地震映像资料解释结果和海上钻孔资料结果进行了综合分析对比。结果表明,地震映像法在进行海上探测时,必须安排偏移距使入射角小于40度,否则难以获得较大的穿透系数,也就不能很好地分辨浅部地层,地震映像资料解释结果与海上钻孔资料基本一致,地震映像法是一种用于海上探测的行之有效的方法。

APPLICATION OF SEISMIC IMAGING METHOD IN WATER EXPLORATION TO ACROSSING SEA BRIDGE

In this paper,seismic imaging method was adopted for water exploration in a certain bay.The purpose is to find out the instance of the water bottom interface,rock base overburden,undulation and the structural belt in the axes.Based on establishing a mathematical model of the reflected wave,discuss the choice of offset from the result of flat wave equation;and make a comprehensive comparison between the seismic imaging interpretation result and the drilling data result.The results show that if the method of seismic imaging is used in sea exploration,the offset adopted must be ensured incidence angle less than 40 degrees.Otherwise,it is hard to get an ideal penetration coefficient,and can not distinguish the shallow layer clearly.The seismic imaging interpretation results are the same as the drilling data results mostly and the seismic imaging method is effective in sea exploration.