Pre-stack seismic AVA inversion method based on cross gradient regularization constraints

A pre-stack seismic and cross-gradient technology, which is applied in the field of petroleum geophysical exploration, can solve the problems of seismic AVA inversion instability and achieve the effect of improving stability

Active Publication Date: 2020-07-03
CHINA WEST NORMAL UNIVERSITY
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Problems solved by technology

[0004] Due to the band-limited characteristics of the seismic data itself and the inherent ill-conditioned nature of the inversion problem, the pre-stack seismic AVA inversion is ill-posed

Method used

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  • Pre-stack seismic AVA inversion method based on cross gradient regularization constraints
  • Pre-stack seismic AVA inversion method based on cross gradient regularization constraints
  • Pre-stack seismic AVA inversion method based on cross gradient regularization constraints

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Embodiment Construction

[0023] The specific technical solutions of the present invention are described in conjunction with the examples.

[0024] Taking the Aki-Richards approximate formula as an example, the process of the present invention will be further described in detail, as shown in his 1.

[0025] Step 1: Input the pre-stack seismic data volume, which can be non-stacked pre-stack seismic data, or partially angle-stacked seismic data.

[0026] Step 2: Extract the angle seismic wavelet. The seismic wavelets are extracted according to the incident angles, and the seismic wavelets on the pre-stack seismic data with different incident angles are obtained.

[0027] According to the acoustic logging, shear wave logging and density logging data, the compressional wave velocity v p , shear wave velocity v s and density ρ data and other elastic parameters, the longitudinal wave reflection coefficients at different incident angles are calculated by the Aki-Richards approximation formula, namely

[0...

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Abstract

The invention discloses a pre-stack seismic AVA inversion method based on cross gradient regularization constraint. The method comprises the steps of extracting angle seismic wavelets, establishing aninversion objective function, constructing an initial model and a prior constraint model, and solving by a gradient descent algorithm. According to the method, multiple disciplines such as a geophysical inversion theory and method, an optimization method and geostatistics are integrated, a pre-stack seismic AVA inversion technology, a gradient descent algorithm and a Kriging interpolation methodare organically combined, the stability of a pre-stack seismic AVA inversion result is effectively improved, and the method is suitable for multiple important links such as reservoir prediction and description and fluid identification.

Description

technical field [0001] The invention belongs to the field of petroleum geophysical exploration, and relates to the use of pre-stack seismic data AVA inversion results for multiple links such as reservoir prediction and description, fluid identification, etc. The specific technology is a pre-stack seismic AVA inversion method based on cross-gradient regularization constraints , which can effectively improve the stability of pre-stack seismic AVA inversion results. Background technique [0002] As a core technology of oil and gas reservoir research, seismic inversion plays a huge role in the exploration and development of oil and gas reservoirs. With the deepening of petroleum exploration, exploration and development are gradually developing towards complex subtle and deep unconventional oil and gas reservoirs, and the requirements for seismic inversion accuracy are getting higher and higher. Among many seismic inversion methods and technologies, pre-stack seismic AVA inversi...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01V1/30G01V1/28
CPCG01V1/307G01V1/282
Inventor 代荣获
Owner CHINA WEST NORMAL UNIVERSITY
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