基于共转换点道集的二参数转换波速度分析及动校正方法

Dual-parameter converted wave velocity analysis and dynamic correction based on common-conversion point gather

在不引入介质的各向异性参数并认为共反射点处同时产生波场的反射与转换的状况下,推导P波与P—SV波之间的运动学关系,进而得到转换波时—距曲线方程——转换横波叠加速度分析公式。借助地震全波场数值模拟技术,进行多波波场响应特征的分析研究及多波多分量地震模拟记录的生成,使用计算机C语言编程技术和SU编程技术实现了该方法的软件化。通过模拟数据和实际资料的验证与测试,结果表明所提出的转换波二参数方程精度高、经济实用、效率高,解决了转换波地震资料处理中叠加速度场建立和叠加成像的问题,对多波用于油气勘探具有指导作用。

Assuming that no anisotropy parameters of media are introduced and both reflection and conversion of wave field occur at common reflection points,we deduced the kinematic relation between P-wave and P-SV wave and established the time-distance curve equation of converted wave,i.e.a formula for converted S-wave stack velocity analysis.The full-wave numerical simulation technique was used to analyze the wave field responses of multiwave and to synthesize multiwave multicomponent seismogram.Corresponding software is programmed for this method with C-programming technique and SU-programming technique.Comparison between simulation data and real data shows that the proposed converted wave dual-parameter equation is characterized by high accuracy,practicability and high efficiency.It can solve the problem of stack velocity field building and stack imaging during converted wave seismic processing,and guide the application of multiwave in petroleum exploration.