Seismic data multiple elimination method

A seismic data and multiple wave technology, applied in the field of exploration seismic signal processing, can solve the problems of non-amplitude preservation, low resolution, and no consideration of lateral amplitude changes, achieve good energy concentration, improve calculation efficiency, and avoid resolution. Effect

Active Publication Date: 2019-11-15
CHINA NAT OFFSHORE OIL CORP +1
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Problems solved by technology

The two-dimensional Radon transform algorithm does not consider the three-dimensional effect of seismic wave propagation. The conventional three-dimensional Radon transform algorithm does not consider the anisotropy of formation properties, an

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[0049] In order to make the objectives, technical solutions and advantages of the present invention clearer, the technical solutions of the present invention will be described clearly and completely with reference to specific embodiments of the present invention and the corresponding drawings. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative work shall fall within the protection scope of the present invention.

[0050] Combine figure 1 As shown, in a homogeneous medium, the front of the seismic wave is a spherical surface. When the wave front of the effective wave is reflected by the underground reflecting surface, the front of the reflected wave is also a standard spherical surface. After the seismic reflection is received, the reflection time is the same , The g...

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Abstract

The invention discloses a seismic data multiple elimination method. The method comprises the following steps: S1, inputting three-dimensional data d(offx,t), and according to three-dimensional space coordinate information, extracting channel sets as three-dimensional surface element channel sets dbin(y,x,t); S2, calculating nonlinear trend fitting coefficients p(x) and p(y), writing out conversionoperators Lx, Ly and Lxy, and calculating Radon domain data M; S3, cutting the Radon domain data to obtain a multiple model mra, and performing calculation and conversion to obtain a time-space domain multiple model; S4, performing subtraction to obtain three-dimensional surface element channel sets p after multiple elimination; and S5, sequentially arranging the channel sets according to scalaroffsets to obtain three-dimensional data after multiple elimination. The high-frequency calculation is restrained through a low-frequency result; the low-frequency result does not generate an alias frequency in operation, so that a relatively good high-resolution effect still can be achieved under the condition of sampling sparseness; and meanwhile, the process of improving the resolution by a conventional iterative method is avoided, so that the calculation efficiency is greatly improved.

Description

technical field [0001] The invention relates to the field of seismic signal processing for exploration, in particular to a seismic data multiple wave suppression method. Background technique [0002] During the acquisition of marine seismic data, due to the influence of the strong reflection coefficient of the seawater surface, there will be strong multiple waves in the marine seismic data; the existence of multiple waves seriously affects the velocity analysis and imaging of seismic data; how to effectively remove multiple waves is An important research content in seismic data processing. [0003] Radon transform is one of the most commonly used effective methods for multiple wave suppression in the industry, and it is also widely used in seismic data reconstruction, wave field separation, velocity analysis, etc. The two-dimensional Radon transform algorithm does not consider the three-dimensional effect of seismic wave propagation. The conventional three-dimensional Radon...

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Application Information

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IPC IPC(8): G01V1/36
CPCG01V1/36
Inventor 刘仕友张迎朝邓勇孙万元汪锐廖键
Owner CHINA NAT OFFSHORE OIL CORP
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