用低频信息改善地震成像质量  

Using low-frequency information to improve the quality of seismic imaging

作　　者：郭树祥[1] 

机构地区：[1]胜利油田分公司物探研究院

出　　处：《油气地球物理》2008年第4期5-8,共4页Petroleum Geophysics

摘　　要：地震勘探中的地震波频率范围一般为0～80Hz。由于大地的吸收及高速地层的影响,地震波在传播过程中的高、低频率成分衰减程度存在较大差异。通常,地震波的高频成分衰减严重,低频信息保留相对完整。在模型论证的前提下,研究了利用地震低频信息改进深层速度精度与提高高速层下伏地层成像质量的方法,并应用实际资料的处理进行了验证。研究表明,地震低频信息比高频信息具有更高的抗屏蔽及吸收能力,利用地震低频信息能够提高深层速度的精度和成像质量。The range of seismic wave frequency is generally 0-80Hz in seismic exploration. As the seismic wave absorbed by the earth and impacted by high-velocity formation, the attenuation extent of high-frequency component and low-frequency component is different in seismic waves spreading process. Usually, the high frequency component attenuate more than low-frequency component, the low-frequency information is kept relatively integrated. Under the model demonstration, the method to improve the precision of velocity in deep bed and the imaging of bed under high velocity bed by using seismic low frequency information is researched, and it is demonstrated by processing actual data. The result shows that the low-frequency seismic information have higher capacity in anti-shield and anti-absorption, the precision of velocity in deep bed and the imaging of bed under high velocity bed can be improved by using low-frequency seismic information.

关 键 词：地质模型 记录模拟 速度分析 低频成像 

分 类 号：P315.3[天文地球—地震学] TP751.1[天文地球—固体地球物理学]