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Prestack seismic signal multi harness radial median filtering method

Author: NieAiLan
Tutor: LiuYongHua
School: Chang'an University
Course: Earth Exploration and Information Technology
Keywords: The sweep Median filter Prestack denoising Seismic reflection Near-surface probe
CLC: P631.4
Type: Master's thesis
Year: 2005
Downloads: 248
Quote: 2
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Abstract


Improve the signal to noise ratio seismic record section and resolution seismic exploration has been an important research topic. In recent decades, seismic exploration technology in the field of many technical and indoor reception processing technology, its main purpose is to highlight the significant wave and wave interference suppression, and efforts to put some of the original wave interference effect only play into useful signal to the earthquake gather information to take advantage of the information in order to more effectively describe the underground geology. Therefore, how to solve both suppress interference wave, but also highlight the significant wave, seismic exploration industry has been an extremely important issue. This article describes the energy seismic data processing used several filter denoising techniques, and analyzes their advantages and disadvantages. On this basis, for the class of near-surface engineering geophysical seismic reflection data signal noise separation situation, studied for prestack gathers information and more sophisticated signal noise separation harness radial median filtering method and its practical processing technology. Because median filtering is a nonlinear filtering technique, which is more complex mathematical theory, this paper has only its statistical properties of the theory with the mean filter (linear filtering) in de-noising were compared. This thesis work of the multi-harness radial median filtering technology is used to be regarded as an interference signal surface, refraction, such as the direct wave linear coherence interference signal can be used as a separation or extraction, the wave field record in favor of the structure of the surface low velocity, which has the potential to provide low-cost static correction parameter information. Reflection seismic data processing objectives, these linear interference waves will naturally raise the effective separation of the information reflected wave signal to noise ratio and resolution. And, the paper work of the multi-harness radial median filter, either extracted or linear interference suppression, in any direction, not only to meet the radial filter, the filtering effect can be limited to a specified range ( such fan-shaped, triangular, etc.). Test data through the model, as well as instances of near-surface seismic prestack data processing surface wave suppression test research work, verify the multi-harness radial median filtering method is feasible and practical. In addition, the method is used down the line wave VSP data separation has also made good results. In short, multi-harness radial median filtering method can effectively separate linear interferences in any direction, with a signal to noise separation ability, amplitude fidelity, do not reduce the resolution and other characteristics.

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CLC: > Astronomy,Earth Sciences > Geology > Geology, mineral prospecting and exploration > Geophysical exploration > Seismic exploration
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