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A post-stack seismic wave relative wave impedance inversion method and system

A wave impedance inversion and seismic wave technology, which is applied in the field of oil and gas exploration geophysical processing, can solve the problems that cannot be realized, there is a lot of known information, and it is difficult to obtain high-resolution wave impedance information, etc., to achieve strong anti-noise performance and ensure accuracy Effect

Active Publication Date: 2022-06-28
CHENGDU UNIVERSITY OF TECHNOLOGY
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Problems solved by technology

The main disadvantage of this type of method is that it requires a lot of known information such as well data, and it is difficult to verify the accuracy of statistical logging characteristics and seismic characteristics.
[0007] Conventional post-stack wave impedance inversion techniques such as deconvolution, wave equation, stochastic process, feature analysis, and dynamic features are limited by seismic wave frequency bandwidth, and it is difficult to obtain high-resolution wave impedance information, or require well information More, not possible in some regions

Method used

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  • A post-stack seismic wave relative wave impedance inversion method and system
  • A post-stack seismic wave relative wave impedance inversion method and system
  • A post-stack seismic wave relative wave impedance inversion method and system

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Embodiment 1

[0053] like figure 1 As shown in the figure, the present embodiment provides a method for inversion of relative impedance of post-stack seismic waves, specifically a method for inversion of relative acoustic impedance of post-stack seismic waves based on synchronous squeeze wavelet packet transform, including:

[0054] S1: Obtain the post-stack seismic wave data of the target horizon;

[0055] S2: perform synchronous squeezing wavelet packet transformation on the post-stack seismic wave data track by track, so as to extract the modulo maximum curve within the preset threshold range in the time-frequency domain;

[0056] S3: According to the pre-selected shrunken parent wavelet parameters, use the inverse synchronous squeeze wavelet packet transform to reconstruct the post-stack seismic wave data from the modulus maximum curve;

[0057] S4: Band-pass integration is performed on the reconstructed post-stack seismic wave data to obtain the relative wave impedance.

[0058] The ...

Embodiment 2

[0080] This embodiment provides a post-stack seismic wave relative wave impedance inversion system, including:

[0081] a data acquisition module, configured to acquire post-stack seismic wave data of the target horizon;

[0082] The synchro-squeezed wavelet packet transform module is configured to perform synchro-squeezed wavelet packet transform on the post-stack seismic wave data trace by trace, so as to extract the modulo maximum curve within the preset threshold range in the time-frequency domain;

[0083] The data reconstruction module is configured to reconstruct the post-stack seismic wave data from the modulus maximum curve by using the inverse synchronous squeezed wavelet packet transform according to the preselected shrunken parent wavelet parameters;

[0084] An inversion module configured to perform bandpass integration on the reconstructed post-stack seismic wave data to obtain relative wave impedance.

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Abstract

The invention discloses a post-stack seismic wave relative wave impedance inversion method and system, comprising: acquiring post-stack seismic wave data of a target layer; performing synchronous squeezing wavelet packet transformation on the post-stack seismic wave data track by track to extract in the time-frequency domain The modulus maximum curve within the preset threshold range; according to the pre-selected contraction mother wavelet parameters, the post-stack seismic wave data is reconstructed from the modulus maximum curve by using the synchronous squeeze wavelet packet inverse transform; the reconstructed post-stack seismic wave data Seismic wave data are band-pass integrated to obtain relative wave impedance. No well location information is required, avoiding the defects of traditional wave impedance inversion technology limited by the seismic wave frequency bandwidth and requiring a large amount of well location information, and can be applied to seismic data with low signal-to-noise ratio.

Description

technical field [0001] The invention relates to the technical field of geophysical processing methods for oil and gas exploration, in particular to a method and system for inversion of relative wave impedance of post-stack seismic waves. Background technique [0002] The statements in this section merely provide background information related to the present invention and do not necessarily constitute prior art. [0003] Post-stack seismic impedance inversion is an important technology for oil and gas reservoir prediction. Common post-stack impedance inversion techniques, such as band-limited inversion, are mainly based on the recursive calculation of reflection coefficients based on formation deconvolution, or the use of seismic The waveform is approximated as the reflection coefficient, or the emission coefficient is solved layer by layer by establishing a recursive relationship between the wave impedance and the reflection coefficient. The disadvantage of this type of met...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01V1/28G01V1/30G01V1/36
CPCG01V1/28G01V1/301G01V1/362G01V2210/514
Inventor 王兴建薛雅娟曹俊兴廖万平李卿武王崇名
Owner CHENGDU UNIVERSITY OF TECHNOLOGY
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