高分辨率抛物Radon变换法速度分析

Velocity analysis using high resolution parabolic Radon transform

叠加速度谱是当前速度分析的主要方法,该方法需进行人工速度谱解释且分辨率较低。抛物Radon变换法在模型空间域有较高的分辨率,这一特点为该方法应用于地震资料速度分析提供了前提。给出了用高分辨率抛物Radon变换进行叠加速度拾取的方法,基于水平或中等倾角地层CMP道集时距曲线为双曲线的假设,给出抛物Radon变换法叠加速度求取的基本原理和推导过程。方法求取叠加速度计算流程简单,运算效率较高,而且可逐一CMP道集自动实现速度求取,理论数据试算结果表明高分辨率抛物Radon变换速度分析是可行的和有效的,同时具有高精度。

Stack velocity spectra are commonly-used for velocity estimation, however this approach requires artificial velocity spectra interpretation and its resolution is low. Parabolic Radon Transform （PTR） has a high resolution of the spatial domain of a model, and this provides a premise for velocity estimation of seismic data. The method of picking stack velocity by PTR is introduced in this paper, based on the hypothesis that the time-distance curve is hyperbolic in CMP gather for lateral and medium dip formation, the principle and derivation of velocity estimation using high PTR is given. The velocity estimation flowchart is simple, and the calculation has high efficiency, another advantage of the proposed technique is velocity picked automatically for every CMP gather. The result of theoretical data demonstrated high resolution PRT is valid and applicable, and it has high precision for stack velocity analysis.