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Amplitude versus offset (AVO) characteristic-based common reflection point (CRP) gather true amplitude recovery method

A recovery method and true amplitude technology, applied in the field of geological exploration, can solve the problems of CRP gather amplitude data error noise influence, error, etc.

Active Publication Date: 2014-03-05
成都晶石石油科技有限公司
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  • Abstract
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Problems solved by technology

[0011] In order to overcome the technical defect of the existing technology that the CRP gather amplitude data error is easily affected by noise and produce errors, the present invention discloses a CRP gather true amplitude restoration method based on AVO features

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  • Amplitude versus offset (AVO) characteristic-based common reflection point (CRP) gather true amplitude recovery method
  • Amplitude versus offset (AVO) characteristic-based common reflection point (CRP) gather true amplitude recovery method
  • Amplitude versus offset (AVO) characteristic-based common reflection point (CRP) gather true amplitude recovery method

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Embodiment Construction

[0037] The specific embodiment of the present invention will be further described in detail below in conjunction with the accompanying drawings.

[0038] The pre-stack CRP gather is the common reflection point gather after pre-stack time migration. Using the offset and amplitude measured in the pre-stack CRP gather, the incident angle and reflection coefficient of each trace can be obtained. Using the AVO attribute analysis Technology (Amplitude Versus Offset, the amplitude varies with the offset), the incident angle and the physical law of the reflection coefficient can be described by the Zoeppritz (Zoepritz) equation. After obtaining the determined relationship between the angle of incidence and the reflection coefficient, the prestack attributes can be obtained.

[0039] Due to the existence of clutter signals, the regularity of the pre-stack CRP gather data is covered by the clutter signals. The present invention restores the true amplitude of the pre-stack CRP gathers ba...

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Abstract

The invention discloses an amplitude versus offset (AVO) characteristic-based common reflection point (CRP) gather true amplitude recovery method which comprises the following steps: 1. performing data processing on pre-stack CRP gather E1 so as to obtain a data set consisting of an incident angle and a reflection coefficient; 2. removing data points with a large relative error until a removal ratio reaches a preset value; 3. fitting R, W and V by utilizing the incident angle and the reflection coefficient; and 4. correcting a to-be-corrected subset E4 in the pre-stack CRP gather through the R, W and V obtained through fitting. According to the AVO characteristic-based CRP gather true amplitude recovery method disclosed by the invention, a Zoeppritz elastic wave kinetic theory is taken as the basis, so that a relationship of changing the pre-stack amplitude along with geophone offset is taken as a target. The seismic data is subjected to removal fitting through a Shuey equation, and an accurate true amplitude effective signal is acquired.

Description

technical field [0001] The invention belongs to the field of geological prospecting and relates to early data processing of seismic prospecting methods, in particular to a method for recovering true amplitude of CRP gathers based on AVO features. Background technique [0002] CRP gathers are common reflection point gathers after pre-stack time migration, which basically eliminates the influence of interface bending and inclined formations on amplitude. In the pre-processing, all kinds of true amplitude recovery work are generally done. Theoretically speaking, the variation of reflected wave amplitude with offset is close to the application conditions of the Zobritz equation. At present, the theoretical basis of pre-stack attributes and inversion is the Zoblitz equation and its various simplified formulas. It believes that the effective signal should behave as a parabola as the offset changes. Due to the fidelity of the gather, the AVO dispersion The points do not satisfy t...

Claims

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Application Information

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IPC IPC(8): G01V1/28
Inventor 刘力辉
Owner 成都晶石石油科技有限公司
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