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A Method of Adaptive Removal of Strong Earthquake Reflection

A strong reflection and self-adaptive technology, applied in seismic signal processing and other directions, can solve the problem of not specifically removing strong seismic reflection, and achieve the effect of reasonable local structural characteristics

Active Publication Date: 2017-05-03
CHINA PETROLEUM & CHEM CORP +1
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  • Abstract
  • Description
  • Claims
  • Application Information

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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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  • A Method of Adaptive Removal of Strong Earthquake Reflection
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  • A Method of Adaptive Removal of Strong Earthquake Reflection

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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 strong seismic 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; According to the maximum matching projection principle, the optimal wavelet is searched for each trace, and the seismic data volume of each trace is subtracted from the corresponding optimal wavelet to obtain the seismic data volume with the specified strong reflection removed.

[0040] like figure 1 As shown, the method for adaptively removing strong seismic reflections of the present invention includes the following steps:

[0041] (1) Input the three-dimensional seismic data volume, and use the Hilbert transform to calculate...

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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 oil and gas field exploration and development, and particularly relates to a method for adaptively removing strong seismic reflection. Background technique [0002] In seismic exploration, the main frequency of seismic data is usually not high and the resolution is low, but most of the reservoirs are thin reservoirs, and at the same time, they are affected by ineffective strong reflections (such as coal seams, seabed strong reflections, 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] The horizon interpretation is usually aimed at the original seismic section, and the intensity of the amplitude energy in the original seismic section will affect the trend of the traced horizon. In the interpretation process or referring to the instantaneous phase pr...

Claims

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Application Information

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