Median filtering method and system based on vertical earthquake attenuation laws

Abstract

The invention provides a median filtering method and system based on vertical earthquake attenuation laws. The method comprises the following steps: collecting VSP (Vertical Seismic Profiling) data; selecting single component data according to the VSP data; carrying out zero-phasing treatment on the single component data, so as to obtain a profile treated through zero-phasing treatment; obtaining a time curve according to the profile treated through zero-phasing treatment; determining spherical spreading compensation TAR factors according to the profile treated through zero-phasing treatment and the time curve; pulling the profile treated through zero-phasing treatment to be homogeneous along the time curve, and obtaining a homogeneously pulled profile; carrying out directional weight median filtering on the homogeneously pulled profile according to the TAR factors of the VSP data. The median filtering method and system, provided by the invention, solve the problem of no reliable wave field separation method in VSP data processing used for well control.

Description

technical field [0001] The present invention relates to the technical field of geophysical exploration, in particular to the technology of vertical seismic data processing in geophysical exploration, specifically a median filtering method and system based on vertical seismic attenuation law. Background technique [0002] Abundant wave field information is an important feature of vertical seismic profile VSP data. In the profile, we can see the interweaving phenomenon of various wave fields. Usually, VSP data do not have a high coverage of ground earthquakes, so it is difficult to strengthen or attenuate a certain wave field by superposition. Therefore, the application of the wave field separation method in the processing of VSP data is particularly important. [0003] In the prior art, there is no targeted wave field separation method in the VSP data processing scheme, and the wave field separation methods are all borrowed from ground seismic data processing methods, such a...

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Problems solved by technology

[0006] In order to solve the problem that there is no reliable wave field separation method in the VSP data processing for well control in the prior art, the present invention proposes a method based on vertical The median filtering method and system of the seismic attenuation law is an accurate median filtering scheme based on the vertical seismic attenuation law. The single-component data is obtained from the VSP data, and the single-component data is zero-phased. Combined with the time-distance curve Determine the TAR factor, align the profile along the time-distance curve, and perform directional weighted median filtering, which greatly improves the reliability of median filtering

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