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VSP wave field separation method and device based on median filtering

A wave field separation and wave field technology, applied in the field of improved VSP wave field separation devices, can solve problems such as complex processing steps, and achieve the effects of avoiding errors and simplifying complexity

Active Publication Date: 2017-11-03
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the existing technology, it is necessary to preprocess the wave field to be separated in the data first (such as event flattening), then apply median filtering to separate the corresponding wave field, and finally perform reverse processing relative to the preprocessing (such as event flattening). back-pull processing) to restore the separated gathers, the processing steps are more complicated and unsatisfactory

Method used

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  • VSP wave field separation method and device based on median filtering
  • VSP wave field separation method and device based on median filtering
  • VSP wave field separation method and device based on median filtering

Examples

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Embodiment 1

[0023] Figure 4 A flow chart of an improved VSP wavefield separation method based on median filtering according to an embodiment of the present invention is shown. In this embodiment, the method includes:

[0024] Step 401, identifying the wave field information to be separated based on the VSP data, the wave field information to be separated includes the position of the point to be separated in each seismic trace;

[0025] Step 402, in each seismic trace, use the point to be separated in the seismic trace as the center point of the initial time window for one-dimensional median filtering, and perform one-dimensional median filtering on the seismic trace to separate the to-be-separated point Separated wavefield information.

[0026] In this embodiment, the initial time window of the one-dimensional median filter is directly determined centering on the wave field information to be separated, and there is no need to perform preprocessing such as flattening the event before se...

Embodiment 2

[0030] In this embodiment, an improved VSP wave field separation device based on median filtering is disclosed, the device includes: a wavelength information identification unit for identifying wave field information to be separated based on VSP data, and the wave field information to be separated The wave field information includes the position of the point to be separated in each seismic trace; the median filtering unit is used to use the point to be separated in the seismic trace as the center point of the initial time window for one-dimensional median filtering, performing one-dimensional median filtering to separate the wave field information to be separated.

[0031] In an example of this embodiment, the wavefield information to be separated may include an event.

[0032] In an example of this embodiment, the length of the time window may range from 7 to 13.

[0033] Application example

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PUM

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Abstract

The invention discloses a VSP wave field separation method and device based on median filtering. The method comprises steps of recognizing to-be-separated wave field information based on VSP data, wherein the to-be-separated wave field information comprises positions of to-be-separated points in each earthquake channel; in each earthquake channel, using the to-be-separated points in the earthquake channel as center points of initial time windows of one-dimensional median filtering, and carrying out the one-dimensional median filtering on the earthquake channel so as to separate the to-be-separated wave field information. According to the invention, there is no need to carry out preprocessing of flattening co-phase axes and the corresponding reversed recovering after separation before the separation, so complexity of the wave field separation is greatly reduced, and unnecessary errors caused by the preprocessing and the reversed recovering can be avoided.

Description

technical field [0001] The present invention relates to the field of seismic data processing, more specifically, to an improved VSP wave field separation method based on median filtering and an improved VSP wave field separation device based on median filtering. Background technique [0002] Wave field separation is a very important link in VSP data processing. Accurate wavefield separation is the basis of VSP data processing. VSP data contain a variety of wave field information, and specific wave field information often has specific geological significance, so fine wave field separation can provide support for subsequent anisotropy parameter extraction, velocity modeling, and migration imaging. and help, and improve the end result. [0003] The precise separation of wave field information such as upgoing waves, downgoing waves, and converted waves in the VSP data gather is conducive to obtaining better subsurface medium attribute information, providing good prerequisites ...

Claims

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Application Information

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IPC IPC(8): G01V1/36
CPCG01V1/36G01V1/364
Inventor 宋林徐兆涛李栋刘旭跃
Owner CHINA PETROLEUM & CHEM CORP
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