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Inversion method of frequency dispersion amplitude versus offset (AVO)

A dispersion and inversion technology, applied in the field of seismic exploration, can solve the problems of ignoring the variation characteristics of amplitude with frequency and unreliable results, so as to achieve reliable results, reduce risk costs, and improve oil and gas recovery efficiency

Active Publication Date: 2012-05-30
BC P INC CHINA NAT PETROLEUM CORP +1
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Problems solved by technology

[0023] The current AVO inversion analysis ignores the variation of amplitude with frequency, so for fluid media or two-phase media, the obtained results are not reliable enough

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  • Inversion method of frequency dispersion amplitude versus offset (AVO)
  • Inversion method of frequency dispersion amplitude versus offset (AVO)
  • Inversion method of frequency dispersion amplitude versus offset (AVO)

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Embodiment Construction

[0032] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.

[0033] According to Smith&Gidlow's AVO approximation formula, combined with modern spectrum analysis technology, the embodiment of the present invention theoretically deduces the dispersion AVO inversion formula based on spectrum analysis technology, that is, the reflection coefficient in Smith&Gidlow's AVO approximation formula is considered to be related to frequency function, extend the AVO approximation formula to the amplitude of the spectrum...

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Abstract

The invention discloses an inversion method of frequency dispersion amplitude versus offset (AVO). The inversion method comprises the following steps: acquiring a pre-stack trace gather; carrying out spherical diffusion compensation and dynamic correction on the pre-stack trace gather, and carrying out instant spectrum analysis on the pre-stack trace gather, so as to generate amplitude spectra under different frequencies; carrying out amplitude spectrum balancing on the amplitude spectra; acquiring a stacking velocity of sampling points in the pre-stack trace gather; generating a layer velocity of the sampling points according to the stacking velocity; generating speed variation rate of the velocity of vertical and horizontal waves under a set frequency and frequency dispersion degree of the sampling points according to the amplitude spectra after amplitude spectrum balancing, the layer velocity of the sampling points, and least square inversion; and ranking the generated frequency dispersion degree according to the trace gather serial number, so as to generate an attribute section of the frequency dispersion degree. By utilizing the inversion method of frequency dispersion AVO provided by the embodiment of the invention, the influence of a strong amplitude energy group caused by impedance difference of an elastic interface wave can be eliminated, and the false 'frequency abnormality' caused by the stacking when post-stack seismic data spectrum is analyzed can be avoided, so that the obtained result is more reliable.

Description

technical field [0001] The invention relates to the technical field of seismic exploration, and is a new seismic attribute used to describe the degree of dispersion of seismic signals, specifically a dispersion AVO (Amplitude Versus Offset) inversion method. Background technique [0002] The current P-wave AVO inversion technology only considers the variation of seismic wave amplitude information with offset, and believes that changes in fluid properties and fluid saturation in reservoirs lead to differences in wave impedance in formations, thereby causing changes in seismic wave reflection amplitudes. And this change is independent of frequency. However, both sandstone reservoirs and carbonate reservoirs are two-phase media composed of solid and liquid, and the existence of fluid causes different degrees of dispersion and attenuation of seismic waves. The current AVO analysis ignores the characteristics of the variation of amplitude with frequency, which is affected by the...

Claims

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Application Information

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IPC IPC(8): G01V1/28G01V1/30G01V1/36
Inventor 李向阳陈双全吴小羊张峰
Owner BC P INC CHINA NAT PETROLEUM CORP
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