A Broadband Seismic Multi-Domain Joint AVO Inversion Method
An inversion, broadband technology, applied in seismic signal processing, seismology for logging records, etc., can solve the problem that it is difficult to establish an initial model in the target area, and achieve full-band inversion prediction of elastic parameters, reasonable and stable estimated effect
Active Publication Date: 2018-11-13
CHINA UNIV OF PETROLEUM (EAST CHINA)
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Problems solved by technology
Conventional seismic exploration low-frequency models mainly use known logging data in the target area, and are established by interpolation or extrapolation under geological or horizon constraints. Obtain good modeling results, but it is difficult to establish a reasonable initial model in the target area with complex geological conditions and large lateral changes
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[0061] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments, so that those skilled in the art can better understand the present invention and implement it, but the examples given are not intended to limit the present invention.
[0062] The low-frequency end of the effective frequency band of broadband seismic data can be as low as 2 Hz, which brings new opportunities for the establishment of low-frequency models for AVO inversion, that is, the effective low-frequency information of broadband seismic data can be fully utilized for low-frequency model prediction. The invention makes full use of the advantages of Laplace-Fourier domain inversion in mining low-frequency information, and proposes a broadband seismic multi-domain combined AVO inversion method.
[0063] Such as figure 1 As shown, a kind of broadband seismic multi-domain joint AVO inversion method proposed by the present invention mainly includes...
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The invention discloses a wideband seismic multi-domain combined AVO inversion method, and relates to the field of seismic prospecting. The method comprises the steps that 1) Laplace-Fourier domain AVO inversion is carried out to predict an elastic parameter low-frequency model; 2) time-domain AVO inversion is carried out to predict full-frequency-band of elastic parameters by utilizing the elastic parameter low-frequency model obtained in the step 1) as an initial model of time-domain AVO inversion, and realizing full-frequency-band inversion prediction of the elastic parameters in the time domain. According to the invention, wideband seismic data is utilized, the elastic parameter low-frequency model is predicted via inversion in the Laplace-Fourier domain, the disadvantage that routine seismic AVO invention by means of logging information modeling is hard to obtain a reasonable result under a complex geological condition is overcome, the parameter low-frequency model is estimated reasonably and stably, the low-frequency model serves as an initial model of inversion, and full-frequency-band inversion prediction of the elastic parameters in the time domain is realized.
Description
technical field [0001] The invention relates to the field of seismic exploration, in particular to a broadband seismic multi-domain joint AVO inversion method. Background technique [0002] AVO inversion is an important means to obtain elastic parameters of subsurface media. Conventional seismic AVO inversion mainly uses the change information of seismic data with offset to establish the quantitative relationship between seismic reflection coefficient and elastic parameters of underground medium as well as offset or incident angle, and realizes elastic Medium parameter inversion prediction. Conventional AVO inversion mainly includes several steps of wavelet extraction, low-frequency model construction, elastic parameter establishment of inversion target function, and optimization inversion. Among them, whether the construction of the low-frequency model is reasonable is an important factor in evaluating the rationality of the inversion. [0003] The frequency band of conv...
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IPC IPC(8): G01V1/48G01V1/50
CPCG01V1/48G01V1/50
Inventor 宗兆云印兴耀吴国忱李坤
Owner CHINA UNIV OF PETROLEUM (EAST CHINA)