An elastic wave full-waveform inversion method and apparatus

A full-waveform inversion, elastic wave technology, applied in measurement devices, instruments, scientific instruments, etc., can solve problems such as deficiencies

Active Publication Date: 2016-04-06
BC P INC CHINA NAT PETROLEUM CORP +1
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Problems solved by technology

[0004] In summary, the current research on the wavelet problem of full waveform inversion mainly focuses on the inversion of acoustic wave wavefo...

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  • An elastic wave full-waveform inversion method and apparatus
  • An elastic wave full-waveform inversion method and apparatus
  • An elastic wave full-waveform inversion method and apparatus

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[0074] In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be described in further detail below in conjunction with the embodiments and accompanying drawings. Here, the exemplary embodiments and descriptions of the present invention are used to explain the present invention, but not to limit the present invention.

[0075] The existing full waveform inversion methods mainly focus on the inversion of acoustic waveforms in the frequency domain, and lack of research on the wavelet problem of the full waveform inversion of elastic waves in the time domain. The invention proposes an elastic wave full waveform inversion method, which is used to realize elastic wave full waveform inversion in time domain independent of wavelet, and reduce or eliminate the influence of inaccurate wavelet estimation on the inversion result.

[0076] figure 1 is a processing flow chart of an elastic wave full waveform inversion met...

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Abstract

The invention discloses an elastic wave full-waveform inversion method and apparatus. The method comprise the steps of establishing a convolution-type objective functional according to analog data and observation data; through adoption of an adjoint method based on the Lagrange theory, determining an adjoint equation of a time domain first order rate-stress elastic wave equation, adjoint epicenter items, a gradient expression of a convolution-type objective functional with regard to model parameters; determining a forward-propagating source wavefield according to the time domain first order rate-stress elastic wave equation; determining reverse-time extrapolation accompanying wavefield according to the adjoint equation and the adjoint focus items; determining the gradient of the convolution-type objective functional with regard to the model parameters according to the forward-propagating epicenter wavefield, the reverse-time extrapolation accompanying wavefield and the gradient expression; and carrying out multi-scale full-waveform inversion through utilization of low pass filtering characteristics of the convolution-type objective functional. According to the invention, influences by imprecise estimation of wavelets on inversion results can be eliminated, and problems that wavelets are difficult to accurately extract in practical data are effectively solved.

Description

technical field [0001] The invention relates to the technical field of petroleum seismic exploration velocity modeling, in particular to an elastic wave full waveform inversion method and device. Background technique [0002] The full waveform inversion method has high resolution and has great potential to improve the imaging quality. Since a single longitudinal wave cannot accurately simulate the propagation law of seismic waves in elastic media, and cannot explain and deal with issues such as shear wave conversion, in order to better describe the parameters of the underground medium and reconstruct the information of the underground structure, full elastic wave inversion is very important. important. The traditional elastic wave full waveform inversion method is based on the assumption that the wavelet is known. However, it is difficult to obtain accurate source wavelet in actual exploration. Inaccurate wavelet estimation will lead to phase mismatch between simulated data...

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Application Information

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IPC IPC(8): G01V1/28G01V1/36
CPCG01V1/28G01V1/362
Inventor 周辉张庆臣陈汉明张光超
Owner BC P INC CHINA NAT PETROLEUM CORP
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