岩性油气藏 ›› 2026, Vol. 38 ›› Issue (1): 115125.doi: 10.12108/yxyqc.20260110
• 地质勘探 • 上一篇
FENG Yancang1(
), LIU Wenqing1, ZHANG Huixing2, WU Jie1, LI Dongsheng1
摘要:
弹性波逆时偏移技术在面对复杂地质构造时,背向发育的反射波与正常传播的波场互相关易产生较强振幅的低频噪声。为了解决常规Poynting矢量的行波分离逆时偏移算法计算不稳定、行波分离精度不高等问题,开展了基于光流矢量的TI 介质逆时偏移方法研究,通过将光流学与各向异性介质弹性动力学相结合,经过多次迭代运算得到一个更逼近于真实波场传播方向信息的精确矢量,有效压制了偏移噪声。研究结果表明:①利用光流法相邻时间内波场不变的假设和在空间方向上波场光滑的假设得到的TI 介质的光流矢量可以有效避免Poynting矢量的不稳定隐患,能精确指示TI 介质中纵横波的传播方向。②基于光流矢量的行波分离方法可以精确地分离出波场的上、下、左、右行波。③基于光流矢量的TI 介质逆时偏移算法可以有效避免同路径波场的互相关成像,可压制偏移噪声。
中图分类号:
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