基于正演模拟的横向变速介质叠加速度误差分析

速度是地震勘探中最重要的参数之一,直接关系到叠加和偏移的质量。在常规的速度分析过程中,为了使CMP道集中的反射同相轴对的最齐而提取的叠加速度,是将地层假设成均匀介质,这在地层复杂地区会引起较大的误差。首先阐述了横向变速介质中叠加速度产生误差的原因,然后对天山南缘地区实际过井剖面进行波动方程正演模拟,分析了叠加速度误差产生的原因和大小,并探讨了消除误差的方法,为变速成图提供了更可靠的速度场。

Analysis on Stack Velocity Error of Lateral Variable Medium Based on Forward Simulation

Velocity was one of the important parameters in seismic exploration, it was directly related to the quality of super position and offset, by which high errors were caused in complicated seismic areas. The reason of stack velocity errors in lateral variable medium is denoted, a forward simulation of wave equation is conducted on actual well profile from the south margine of Tianshan, the reason and size of the stack velocity errors are analyzed and the methods for avoiding them are discussed, and more reliable velocity field is provided for variable diagram.