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Method for self-adaptively removing strong reflection of earthquake

A strong reflection, self-adaptive technology, applied in seismic signal processing and other directions, can solve the problem of not specifically removing strong seismic reflection.

Active Publication Date: 2015-04-29
CHINA PETROLEUM & CHEM CORP +1
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Problems solved by technology

[0005] There is currently no method for specifically removing strong seismic reflections

Method used

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  • Method for self-adaptively removing strong reflection of earthquake
  • Method for self-adaptively removing strong reflection of earthquake
  • Method for self-adaptively removing strong reflection of earthquake

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Embodiment Construction

[0038] Below in conjunction with accompanying drawing, the present invention is described in further detail:

[0039] A method for adaptively removing seismic strong reflections. The method first calculates the instantaneous phase cosine of the entire three-dimensional seismic data volume; for the instantaneous phase cosine data volume, the cross-correlation method is used to automatically pick up the reflection time of the specified strong reflection; Time, according to the principle of maximum matching projection to find the optimal wavelet for each trace, subtract the corresponding optimal wavelet from the seismic data of each trace, and obtain the seismic data volume without the specified strong reflection.

[0040] Such as figure 1 As shown, the method for adaptively removing seismic strong reflection of the present invention comprises the following steps:

[0041] (1) Input the 3D seismic data volume, calculate the instantaneous phase cosine cosθ(t) of each seismic sign...

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Abstract

The invention provides a method for self-adaptively removing strong reflection of an earthquake and belongs to the field of pre-treatment of seismic data in exploration and development of oil and gas field. The method comprises the following steps: (1) inputting a three-dimensional seismic data body and calculating instantaneous phase cosine costhea(t) of each seismic signal in the whole three-dimensional seismic data body by Hilbert transform to obtain an instantaneous phase cosine data body; (2) aiming at the instantaneous phase cosine data body, automatically picking up the layer where an appointed point is by virtue of a cross-correlation method and recording the reflection time ti of each strong reflection layer, wherein the appointed point is the time of strong reflection corresponding to some channel pre-set by a user; (3) matching the optimal wavelet for input seismic data according to layer time of the channel which is automatically picked up in light of the maximum matching projection principle; then subtracting the matched optimal wavelet from the seismic data of the channel to obtain the seismic data removing appointed strong reflection of the channel.

Description

technical field [0001] The invention belongs to the field of seismic data preprocessing in the exploration and development of oil and gas fields, and in particular relates to a method for adaptively removing strong seismic reflections. Background technique [0002] In seismic exploration, the dominant frequency of seismic data is usually not high and the resolution is low, and most of the reservoirs are thin reservoirs, and at the same time, they are affected by the invalid strong reflection of the target layer (such as coal seam, strong reflection of the seabed, etc.) The effective reflection of the target layer is submerged in the strong reflection, and it is difficult to identify the target sand body from the conventional seismic data. [0003] Usually horizon interpretation is aimed at the original seismic section, and the strength of the amplitude energy in the original seismic section will affect the direction of the traced horizon. In the process of interpretation, t...

Claims

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Application Information

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IPC IPC(8): G01V1/36
Inventor 陈科王鹏燕庞锐
Owner CHINA PETROLEUM & CHEM CORP
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