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Multiscale Seismic Full Waveform Inversion Method Based on Local Adaptive Convexification Method

A full waveform inversion and local self-adaptive technology, applied in the field of seismic exploration, can solve problems such as data mismatch, inaccurate source function inversion, missing low frequency seismic data, etc.

Active Publication Date: 2019-01-11
CHINA NAT OFFSHORE OIL CORP +1
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Problems solved by technology

[0005] In view of the above problems, the object of the present invention is to provide a multi-scale seismic full waveform inversion method based on the local adaptive convexization method, which can solve the problem of inaccurate source function inversion, missing low frequencies in seismic data, and low-pass filtering. Data Mismatch Problem

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  • Multiscale Seismic Full Waveform Inversion Method Based on Local Adaptive Convexification Method
  • Multiscale Seismic Full Waveform Inversion Method Based on Local Adaptive Convexification Method
  • Multiscale Seismic Full Waveform Inversion Method Based on Local Adaptive Convexification Method

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[0093] The present invention will be described in detail below in conjunction with the accompanying drawings and embodiments.

[0094] The present invention proposes a multi-scale seismic full waveform inversion method based on a local adaptive convexization method, which includes the following steps:

[0095] 1) Preprocessing the seismic data collected in the field, including removing surface multiples, reverberation, and protecting low frequency denoising;

[0096] 2) Take the Lake wavelet as the real source function (such as Figure 2a , Figure 2b shown), and use the zero value sequence as the source function to invert the initial value (such as Figure 5a , Figure 5b shown);

[0097] 3) Use existing methods to establish an initial velocity model based on the geological background and velocity analysis results of the work area, and use this initial velocity model as the initial value of the full waveform inversion (such as Figure 11a , Figure 11b shown); 4) intercep...

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Abstract

The invention relates to a multi-scale seismic full-waveform inversion method based on a local adaptive convexification method. The method comprises steps: pre-processing is carried out, a zero value sequence serves as an initial value, and an initial speed model serves as a starting value; direct wave information is intercepted; forward modeling direct waves are obtained; an objective function inverted by a seismic source function is built; a direct wave residual and a direct wave residual back propagation wave field are obtained; an updating gradient and an updating direction of the seismic source function are calculated, and a step length is searched; the high-precision seismic source function obtained through inversion is outputted; attenuation time window processing is carried out; seismic data in the time window are simulated; local convexification processing and separation processing are carried out; a high-frequency component in an observation record is removed; a least square objective function is built, and a wave field residual is obtained; a residual back propagation wave field of the model space is obtained; the model updated gradient is obtained; the model updated direction is calculated, and the step length is searched; a multi-scale seismic full-waveform inversion result is outputted; and a final inversion result is outputted. The method is widely applied in the technical field of seismic exploration.

Description

technical field [0001] The invention relates to a multi-scale seismic full waveform inversion method based on a local self-adaptive convexization method, belonging to the technical field of seismic exploration. Background technique [0002] In the 1990s, Pratt extended the full waveform inversion to the frequency domain, and proposed that only a few discrete frequencies are needed to obtain high-precision inversion results, and the multi-scale inversion strategy from low frequency to high frequency can solve the problem of falling into local extremes. problem with small values. However, full waveform inversion is a strongly nonlinear problem, which is very sensitive to noise, initial model, low-frequency components and source functions (Wang, Y., Rao, Y., 2006; Virieux and Operto, 2009). The complexity of propagation, that is, the complex relationship between seismic data and physical parameters of underground media (Jannane et al., 1989; Dong Liangguo, 2013). When the low...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01V1/30
CPCG01V1/303G01V2210/6222
Inventor 刘春成韩立国张益明牛聪王者江胡勇黄饶凌云叶云飞仝中飞
Owner CHINA NAT OFFSHORE OIL CORP
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