论文部分内容阅读
多次波衰减问题仅得到部分解决。一种最常见的多次波衰减方法是以拉冬变换为基础的。一个普遍接受的观点是抛物线型拉冬变换只能衰减具有较大时差的多次波。我们提出一种新的2-D方法,它能够在抛物线型τ-ρ域衰减与表面有关的多次波和层间多次波。该方法是以从一次波的波前特征得到的多次波模型预测为基础的。多次被预测包括以下几步: (1)对于一给定的多次波型式,对共炮点道集中每个接收器的一次反射估算出射角和波前曲率的半径; (2)对每个地检对确定组成一特定多次波至的中间点; (3)计算多次波的旅行时。预测的旅行时曲线附近时窗内的波场可以认为是我们用于多次波衰减处理的多次波模型。使用预测的多次波旅行时,我们可以确定包括多次波至主要能量的τρ域范围。通过τ-ρ空间每个样值与一非线性相似函数的简单相乘能够改善抛物线型拉冬算子的解。在本项研究中,我们通过将多次波模型的能量与τ-ρ空间的原始输入数据相比较来自动确定多次波抑制区。我们图示说明了此多次波衰减算法对合成资料和实际资料的应用。
The problem of multiple attenuation is only partially solved. One of the most common methods of multipath attenuation is based on the dragons transformation. A generally accepted view is that the parabolic dragons transform attenuates only multiples with large time differences. We propose a new 2-D method that attenuates surface-related multiples and interplastibubles in a parabolic τ -ρ domain. The method is based on the prediction of multiple model from the wavefront characteristics of the primary wave. The multiple predictions include the following steps: (1) For a single reflection of each receiver in a common shot gathers for a given multiple pattern, estimate the radii of the exit angles and wavefront curvatures; (2) for each A check to determine the composition of a specific multiple to the midpoint; (3) calculation of multiple travel time. The wave field in the time window near the predicted travel time curve can be considered as our multiple-wave model for multiple attenuation. With the predicted multiples traveling, we can determine the τρ domain range from multiples to main energies. The simple multiplication of each sample in τ-ρ space with a nonlinear similarity function can improve the solution of the parabolic-type dragwin operator. In this study, we automatically determine the multiple rejection region by comparing the energy of the multiple model with the raw input data in τ-ρ space. We illustrate the application of this multiple-wave attenuation algorithm to synthetic and actual data.