Method for modeling reflection coefficient of spherical PP wave in viscoelastic medium

A modeling method and wave reflection technology, which is applied in the field of petroleum geophysical exploration, can solve the problems of not comprehensively considering the characteristics of spherical wave reflection coefficient

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

[0004] At present, there is no research on the characteristics of spherical wave reflection coeff

Method used

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  • Method for modeling reflection coefficient of spherical PP wave in viscoelastic medium
  • Method for modeling reflection coefficient of spherical PP wave in viscoelastic medium
  • Method for modeling reflection coefficient of spherical PP wave in viscoelastic medium

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Embodiment Construction

[0062] The present invention will be described in further detail below in conjunction with the accompanying drawings:

[0063] The invention combines the White model and the plane wave decomposition algorithm of the spherical wave, and comprehensively considers the attenuation and dispersion effects of the viscoelastic medium and the spherical wave effect of seismic wave propagation. First obtain the plane wave reflection coefficient in the dispersive porous medium according to the White model and the Zeoppritz equation of the viscoelastic medium, and then obtain the AVAF of the spherical wave reflection coefficient in the dispersive porous medium based on the plane wave decomposition algorithm of the spherical wave (amplitude varies with frequency and angle) feature.

[0064] Such as Image 6 As shown, this method specifically includes:

[0065] (1) Calculate the longitudinal wave phase velocity υ based on the White model p And quality factor Q -1

[0066] Starting from the reservoi...

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Abstract

The invention provides a method for modeling a reflection coefficient of a spherical PP wave in a viscoelastic medium and belongs to the field of geophysical prospecting for petroleum. The method comprises steps as follows: (1) a longitudinal wave phase velocity vp and a quality factor Q<-1> are calculated on the basis of a White model: the longitudinal wave phase velocity vp and the quality factor Q<-1> are calculated on the basis of the White model and reservoir parameters; (2) a reflection coefficient of a planar PP wave in a dispersive porous medium is calculated: the longitudinal wave phase velocity vp and the quality factor Q<-1> which are obtained in Step (1) are introduced in a Zoeppritz equation of the dispersive medium, and the reflection coefficient R<*>PP of the planar PP wave in the dispersive porous medium is calculated; (3) the reflection coefficient of the spherical wave is calculated: after the reflection coefficient R<*>PP of the planar PP wave is calculated in Step (2), the reflection coefficient of the spherical PP wave in the dispersive porous medium is modeled with a planar wave decomposition algorithm of the spherical wave, and the reflection coefficient R<spherical>PP of the spherical PP wave in the dispersive porous medium is calculated.

Description

Technical field [0001] The invention belongs to the field of petroleum geophysical exploration, and specifically relates to a method for modeling spherical PP wave reflection coefficient in viscoelastic media. Starting from reservoir parameters, the spherical PP in viscoelastic media is calculated based on the White model and the plane wave decomposition algorithm of spherical waves. Modeling of wave reflection coefficient. Background technique [0002] Traditional AVO (amplitude varies with offset) or AVA (amplitude varies with incident angle) is based on the assumption of plane waves (geometric seismology). However, when the source or geophone is very close to the reflection interface or the reflection wave field near the critical angle needs to be studied, the geometric seismological approximation becomes inaccurate. This is because point sources are used in actual seismic exploration, and spherical waves are excited. (1961) first proposed the concept of spherical wave refle...

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Application Information

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IPC IPC(8): G01V1/28
Inventor 杨心超滕龙王世星
Owner CHINA PETROLEUM & CHEM CORP
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