基于射线理论的角度道集提取方法综述

Overview of extraction methods of angle gathers based on ray theory

本文研究了提取角度道集过程中的不同方法对结果的影响,炮检距和入射角之间的转换方法多种多样,需要根据实际资料特征进行合理选取.插值法和菲涅尔带法依然是提取角度道集的基本方略,信噪比高的资料运用插值法可以高精度地还原AVO特性.提取部分叠加道集的方法也有多种,在有噪音的情况下,角度扫描道集上的部分叠加能更加准确得体现AVO信息.

In angle gathers extraction, different methods may lead to different results. There are various methods to transform offset to incidence angle, such as the straight ray and Walden formula, among which one need to select according to the property of data being processed. Interpolation and Fresnel Zone remain the basic strategies in the extraction. Interpolation methods, such as spline interpolation, could provide more accurate AVO property for the data with high SNR, but they are very sensitive to noise. Stacking methods are more feasible for noisy seismic data, which are much more applicable for real data processing. Partial stacks can be extracted from different kinds of gathers, however, method based on scan gathers could provide more accurate AVO information when SNR is relatively low.