Seismic data inversion method and system

An inversion and data technology, applied in the field of geophysical exploration data processing, can solve the problems of high difficulty in determining scale factors and cycle jumps, and achieve the goals of avoiding the selection of non-physical scale factors, accurate long-wavelength static correction, and saving memory Effect

Inactive Publication Date: 2017-11-10
UNIV OF SCI & TECH OF CHINA
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Problems solved by technology

[0004] In order to solve the problem of period jumping, researchers have proposed many methods, one of which is the joint inversion method, which is realized by performing waveform inversion and traveltime tomography simultaneously. The physical scale factor has a decisive influence on the final inversion result, so it is necessary to choose a non-physical scale factor for different inversion problems. However, the determination of the scale factor is relatively difficult, which brings challenges to the inversion

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  • Seismic data inversion method and system
  • Seismic data inversion method and system
  • Seismic data inversion method and system

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example ( 1

[0098] Example (1) Synthetic test:

[0099] refer to figure 2 (a), figure 2 (a) is the artificially synthesized real velocity model, where the points at the top of the model in the figure represent the shot point and the receiver point respectively. The horizontal distance and depth of the model are 5000 meters and 600 meters respectively, and the grid is 10 meters square. The observation system includes 80 guns and 160 geophones, and the distance between the guns and the geophones is 60 meters and 30 meters, respectively. First arrival traveltime data and waveform data are obtained by ray tracing and finite difference methods, respectively.

[0100] refer to figure 2 (b), figure 2 (b) The initial model used in the subsequent inversion, which was established by first-arrival traveltime tomography. Seismic waveform data is decomposed into 8 scales by wavelet transform, the maximum scale is 8, the minimum scale is 1, let scale 0 be the original data. In this synthetic ...

example ( 2

[0104] Example (2) Actual data test:

[0105] This example uses a 2D land data set from a region. The geology of this region is very complex, making it difficult to image the region by seismic methods. The topography of the area varies drastically, with elevation changes ranging from 3,500 to 2,000 meters along the survey line from south to north. The survey line includes 211 shots and 1411 geophones in total, and the shot spacing and geophone spacing are 200 meters and 20 meters respectively. refer to Figure 5 (a), Figure 5 (a) is the initial model built for the subsequent inversion by first-arrival traveltime tomography. In this test, the preprocessed original waveform is divided into 10 scales, and the scales used for inversion are 6, 5, 4 and 0 respectively. Figure 5 (b) shows the results of individual inversions, Figure 5 (c) shows the final result of the interactive inversion based on the method of the present invention.

[0106] Image 6is a quality monitor ...

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Abstract

The invention discloses a seismic data inversion method and a system. A preset number of interactive inversion operations are carried out through iteration. During the interactive inversion operation through iteration each time, the travel-time inversion and the waveform inversion are executed alternately. Namely, the travel-time inversion and the waveform inversion are alternately solved. Meanwhile, the model of the latest inversion operation, namely the travel-time inversion or the waveform inversion, is adopted as an inversion input model for the current travel-time inversion or the current waveform inversion. Based on the above alternate execution and mutual feedback manner of the two inversion operations, the memory is saved and the selection of non-physical scale factors is avoided compared with the joint inversion in the prior art. Through simultaneously fitting travel-time and waveform data, a more reliable seismic velocity model is provided for the near-earth surface, so that obtained long-wavelength static correcting values are more accurate.

Description

technical field [0001] The invention belongs to the technical field of geophysical exploration data processing, and in particular relates to a seismic data inversion method and system. Background technique [0002] In the process of seismic data processing of land and shallow sea, it is very important to solve the problem of near-surface static correction. [0003] At present, the standard method to obtain the near-surface velocity structure is first-arrival traveltime tomography, which benefits from its high efficiency and simple method of use. However, due to theoretical limitations, travel-time tomography cannot solve the problem of hidden formations; at the same time, the resolution of the results is also very limited, and usually cannot obtain detailed, high-resolution structural information. Full waveform inversion was born to solve the above problems. However, there are a large number of local minimum solutions in the objective function of full waveform inversion, wh...

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Application Information

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IPC IPC(8): G01V1/30
CPCG01V1/307G01V2210/67
Inventor 孙梦瑶张捷
Owner UNIV OF SCI & TECH OF CHINA
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