【摘要】 常规叠加速度分析方法虽然业已成熟,然而常规动校正方程是基于炮、检点处于同一水平基准面的假设,在地表起伏较大的地区,即使采用浮动基准面的方法,其速度分析误差也不容忽视。本文提出的基于起伏地表的叠加速度分析方法,应用双平方根方程计算反射波的旅行时间,可适用于地形起伏剧烈地区。文中用模型数据和野外地震资料对该法进行了测试,结果表明:与常规的固定基准面静校正法相比,用该法计算的叠加速度比较可靠,所得速度谱的聚焦效果更好,能获得较多的浅层速度信息,构造特征也刻画得更清晰。文中方法为地表起伏剧烈地区地震资料的速度分析提供了一种手段。更多还原

【Abstract】 Although the ordinary stack velocity analysis method has already matured,the ordinary NMO equation is based on the supposal that the shot and receiver points are located a same horizontal datum plane.In surface-relief area,the error of velocity analysis is unable to be negligible even using floating datum method.The method of stack velocity analysis based on relief surface presented in the paper uses double-square-root equation to compute the travel time of reflections,which is suitable to use in the area where the topography is severely relief.The tests were carried out for the method by model data and field seismic data,which showed that in combination with common fix datum static correction method,the stack velocity computed by the method is more reliable and resulted velocity spectrum has better focus effect,which can obtain more velocity information in shallow layer and clearly demonstrate the structural feature.The method presented in the paper provided a tool for velocity analysis of seismic data in the area where the surface is severely relief.更多还原