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A Modeling Method for Spherical pp-wave Reflection Coefficient in Viscoelastic Media

A modeling method and viscoelastic technology, applied in the field of petroleum geophysical exploration, can solve the problem of not comprehensively considering the characteristics of spherical wave reflection coefficient, and achieve the effect of accurate physical characteristics

Active Publication Date: 2017-10-27
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 coefficient in viscoelastic media that comprehensively considers the above two situations in the world.

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  • A Modeling Method for Spherical pp-wave Reflection Coefficient in Viscoelastic Media
  • A Modeling Method for Spherical pp-wave Reflection Coefficient in Viscoelastic Media
  • A Modeling Method for Spherical pp-wave Reflection Coefficient in Viscoelastic Media

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Embodiment Construction

[0062] Below in conjunction with accompanying drawing, the present invention is described in further detail:

[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, according to the White model and the Zeoppritz equation of viscoelastic medium, the plane wave reflection coefficient in the dispersed porous medium is obtained, and then the AVAF (amplitude varies with frequency and angle) of the spherical wave reflection coefficient in the dispersed porous medium is obtained based on the plane wave decomposition algorithm of the spherical wave feature.

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

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

[0066] Starting from the reservoir...

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Abstract

The invention provides a spherical PP wave reflection coefficient modeling method in a viscoelastic medium, which belongs to the field of petroleum geophysical exploration. The method includes: (1) calculating the P-wave phase velocity υp and the quality factor Q-1 based on the White model: starting from the reservoir parameters, calculating the P-wave phase velocity υp and the quality factor Q-1 based on the White model; (2) calculating the frequency Reflection coefficient of plane PP wave in diffuse porous medium; substituting the longitudinal wave phase velocity υp and quality factor Q‑1 obtained in step (1) into the Zoeppritz equation of dispersive medium, and calculating the Reflection coefficient (3) Calculation of spherical wave reflection coefficient: After the plane PP wave reflection coefficient is obtained in step (2), the spherical PP wave reflection coefficient in the dispersed porous medium is modeled according to the plane wave decomposition algorithm of spherical wave , to obtain the spherical PP wave reflection coefficient in the dispersed porous medium

Description

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

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Application Information

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