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Acoustic impedance inversion method and system for q absorption attenuation compensation

A technology of absorption attenuation and acoustic impedance, which is applied in the field of acoustic impedance inversion methods and systems, and can solve problems such as large errors

Inactive Publication Date: 2019-05-31
CHINA UNIV OF GEOSCIENCES (WUHAN)
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Problems solved by technology

[0008] Comparing Figure 3(b) and Figure 3(a), it can be seen that the reflection coefficient inverted by NSRI is almost the same as the real reflection coefficient, but when the acoustic impedance result is recursively obtained from the inverted reflection coefficient and the initial impedance model , inevitably produces the error accumulation amplification effect of the recursive formula
From the acoustic impedance results obtained by recursion in Figure 3(c), it can be seen that the impedance results obtained by recursion of reflection coefficients appear "noodles" and "strips", and there is a large gap compared with the real impedance model. error

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  • Acoustic impedance inversion method and system for q absorption attenuation compensation
  • Acoustic impedance inversion method and system for q absorption attenuation compensation
  • Acoustic impedance inversion method and system for q absorption attenuation compensation

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[0084] In order to have a clearer understanding of the technical features, purposes and effects of the present invention, the specific implementation manners of the present invention will now be described in detail with reference to the accompanying drawings. The following uppercase and bold letters represent vectors or matrices.

[0085] Simulate Q-filtered seismic data

[0086] Based on the one-dimensional wave equation, the formula for simulating the seismic data s(t) after Q absorption attenuation filtering is:

[0087]

[0088] in, is the Fourier transform spectrum of the input seismic wavelet w(t), ω=2πf is the angular frequency, r(z) is the reflection coefficient at depth z, α(ω,τ z ,Q z ) is the Q absorption attenuation factor, e is an exponential function, t represents time, τ z For propagation travel, it is defined as:

[0089]

[0090] x is the integration variable related to depth, v r is the reference frequency ω r related phase velocity. According t...

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Abstract

The invention specifically provides an acoustic wave impedance inversion method and system for Q absorption attenuation compensation. Impedance inversion is one of the important methods for seismic oil and gas resource exploration. Stratum Q absorption attenuation and frequency dispersion factors are integrated to a convolution model and, through the method of iterative inversion, a high resolution impedance result is obtained directly through inversion from unsteady state seismic record data of absorption attenuation. The method avoids an error accumulation effect in a conventional recursiveprocess and the problem of numerical instability in a conventional inverse Q filtering method; namely, the Q value compensation technology of the invention is unconditionally stable and can compensatefor frequency components higher than those in the conventional technology, so that the resolution of seismic exploration data can be further improved.

Description

technical field [0001] The invention belongs to the field of seismic signal processing in seismic exploration technology, and in particular relates to an acoustic impedance inversion method and system for Q absorption attenuation compensation. Background technique [0002] Post-stack wave impedance inversion technology is an important step in the process of oil and gas seismic exploration data processing. The input of the technology is the post-stack seismic data and the corresponding seismic wavelet. That is, the product of velocity and density. Impedance difference is one of the important methods for oil and gas detection. The difference in impedance between the upper and lower formations determines the reflection coefficient at the formation interface. In the process of seismic exploration, the wave propagates in the stratum. Due to the incomplete elasticity (ie, viscoelasticity) of the stratum medium, the wave absorbs attenuation and disperses during the propagation pr...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01V1/28G01V1/30
CPCG01V1/282G01V1/30
Inventor 柴新涛唐跟阳王尚旭
Owner CHINA UNIV OF GEOSCIENCES (WUHAN)
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