Two-way wave pre-stack depth migration method through one-way wave operator

A pre-stack depth migration and one-way wave technology, applied in the field of migration imaging, can solve the problems that the second-order partial derivative wave equation cannot be solved numerically, and achieve the effect of increasing reliability and high computational efficiency

Active Publication Date: 2016-08-31
CHINA UNIV OF GEOSCIENCES (BEIJING) +1
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Problems solved by technology

[0039] In view of the defects existing in the prior art, the purpose of the present invention is to provide a two-way wave prestack depth migration method u

Method used

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  • Two-way wave pre-stack depth migration method through one-way wave operator
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  • Two-way wave pre-stack depth migration method through one-way wave operator

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example 1

[0147] The purpose of this example is to test the imaging performance of the present invention for complex structures.

[0148] In this example, the following algorithm is used to migrate the shot set records of the Marmousi model forward calculation. See the velocity model figure 1 :

[0149] 1. One-way wave high-order generalized screen prestack depth migration algorithm (Algorithm 1);

[0150] 2. Pre-stack reverse time migration algorithm (algorithm 2);

[0151] 3. Split-step Fourier pre-stack depth migration algorithm with dual detectors (Algorithm 3);

[0152] 4. Double-detector Fourier finite difference pre-stack depth migration algorithm (algorithm 4);

[0153] 5. Double-detector high-order generalized screen pre-stack depth migration algorithm (Algorithm 5).

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Abstract

The invention relates to a two-way wave pre-stack depth migration method through a one-way wave operator. The two-way wave pre-stack depth migration method comprises the following steps that 1. an upper and lower dual detector seismic data acquisition system is adopted so that a detector wave field is formed; 2. seismic wavelet information is extracted so that a seismic source wave field is formed; 3. single-shot seismic data, a speed model and the seismic source wave field are read; 4. Fourier transform is performed on the seismic source wave field and the detector wave field in a time domain so that frequency-space domain wave field data are obtained; 5. depth continuation calculation is performed on the frequency-space domain wave field data; 6. migration imaging is performed by utilizing the principle of cross-correlation imaging or the principle of reflection coefficient imaging; 7. continuation calculation of the steps 4-6 is repeated to the maximum depth, the migration result is saved and the next shot of seismic data are calculated; and 8. the steps 3-7 are repeated to the last shot and a migration profile is outputted. According to the two-way wave pre-stack depth migration method through the one-way wave operator, full wave equation depth migration is performed by utilizing the one-way wave operator so that the rapid and accurate two-way wave depth migration algorithm is realized, and the method has more industrial utilization value.

Description

Technical field [0001] The invention relates to a migration imaging method in seismic exploration, in particular to a two-way wave pre-stack depth migration method using a one-way wave operator. Suitable for oil and gas exploration. One-way wave operator refers to one-way wave continuation operator. Background technique [0002] Seismic exploration methods are currently an important method for oil, natural gas and other energy exploration. Seismic migration (referring to seismic migration imaging technology), as a key link in modern seismic exploration data processing, provides necessary technologies for seismic interpretation and lithological inversion support. Therefore, the development of a true-amplitude seismic migration technology (true-amplitude seismic migration imaging technology) that can not only accurately reflect the shape of the underground structure, but also reflect the lithological changes of the formation, has always been a problem of concern, especially for p...

Claims

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Application Information

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IPC IPC(8): G01V1/30
CPCG01V1/306G01V1/307G01V2210/62G01V2210/63G01V2210/64
Inventor 刘学伟尤加春
Owner CHINA UNIV OF GEOSCIENCES (BEIJING)
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