The Study Of Multiple Attenuation Based On High-resolution Radon Transform

Multiple attenuation is one of the most important geophysical problems, especially in marine seismic exploration. Among the multiple attenuation methods, the Radon transform method is one of the most popular commercial processing software modules with the higher computational efficiency.This paper introduces the basic knowledge of multiple and the common attenuation methods. We improve the computational efficiency and precision based on hyperbolic Radon transform. Considering the frequency domain Radon transform has higher computational efficiency compared with time domain Radon transform. While hyperbolic Radon transform operator is time-variant compared with the linear and parabolic Radon transform. This method can effectively improve the computational efficiency especially for 3D data on the basis of the accuracy of the premise. In the process of inversion, regular Radon transform apply conventional least squares inversion method approaching its inverse transform. However, the smooth change of energy model space data points can not be focused to a point because of the damping regularization operator used in the algorithm. It’s unfavorable for the separation of effective signal and interfering signal. We introduce high-resolution Radon transform, which has sparse constraint weighted operator. It can better focus on effective and multiple energy groups. We can remove the multiple energy group in the Radon domain on the basis of valid signal is not lost as more as possible, and finally we can obtained the seismic records without multiple through the inverse transform to the data space. Considering the low accuracy of the signal-domain multiple attenuation, this paper introduce the common scatter points,which obtained by the equivalent offset mapping and apply Radon transform on it. Compared with common midpoint gather, it can achieve a better multiple attenuation effect based on unaffected by dip information and has more folds, higher offset ranges and anti-aliasing effects.This paper mainly research the method of multiple attenuation based on hyperbolic Radon transform, fast butterfly algorithm, sparse inversion theory. And the research route ranges from 2D space to 3D space, from common midpoint gathers to common scatter point gathers with the wider ranges and the richer gathers information, improving the Radon transform computational efficiency and accuracy so as to achieve a better multiple attenuation effect, providing data base for seismic migration imaging, inversion and interpretation, drilling positioning and so on. The test of model and real data proved the effectiveness of the proposed method.