Earthquake prestack migration imaging method

A pre-stack migration imaging and seismic recording technology, applied in seismic signal processing and other directions, can solve problems affecting the development and application of Gaussian beam migration methods, difficult selection of initial parameters, complex algorithms, etc., to ensure correct homing and imaging Effects of accuracy, search volume reduction, and calculation volume reduction

Active Publication Date: 2013-02-27
INST OF GEOLOGY & GEOPHYSICS CHINESE ACAD OF SCI
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  • Application Information

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Problems solved by technology

Although the Gaussian beam migration method has many advantages compared with other migration methods, the development and application of the Gaussian beam as a

Method used

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  • Earthquake prestack migration imaging method
  • Earthquake prestack migration imaging method
  • Earthquake prestack migration imaging method

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Experimental program
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Embodiment 1

[0041] Such as image 3 Shown is the marmousi longitudinal wave velocity model released by the French Petroleum and Natural Gas Research Center. The velocity model has a complex structure and is a classic model for verifying migration algorithms. Such as Figure 4 What is shown is the result of the recording offset of the marmousi shot set by the present invention, which is consistent with the velocity model structure, and proves the feasibility of the present invention.

Embodiment 2

[0043] Such as Figure 5 Shown here is a depth domain velocity model in a certain sea area, which has obvious velocity depressions and high-steep boundaries.

[0044] Such as Image 6 , Figure 7 As shown, it can be seen from the migration results obtained by using the present invention to perform the migration imaging processing on the actual data and the results obtained using the conventional time-domain Kirchhoff pre-stack migration method, it can be seen that the method of the present invention is compared with the conventional time-domain Kirchhoff migration method. Compared with the method, the obtained stratum homing is more accurate, and the result obtained by the present invention is a depth domain result, which can more accurately reflect the geological structure information of the area.

[0045] Such as Image 6 , Figure 8 As shown, it can be seen from the migration results obtained by using the present invention to perform migration imaging processing on the actual da...

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Abstract

The invention relates to an earthquake prestack migration imaging method which includes the following steps: (1) obtaining observing system information and data features by scanning earthquake records, and calculating to obtain migration initial parameters; (2) launching gauss beam central ray from a cannon point, and calculating travel time and amplitude weighting factors in a nearby area of the ray; (3) launching ray from all gauss beam central positions of a demodulator probe wave field, and calculating travel time and amplitude weighting factors in a nearby area of the ray; (4) by using the travel time and the amplitude weighting factors of the gauss beam at the cannon point and the gauss beam at the demodulator probe position to a certain underground point, the earthquake record is returned to the position according to travel time information and amplitude weighting factor information; (5) repeating the step (1) to the step (4) for each cannon earthquake record, migration results of all canons are obtained and stacked according to corresponding positions to obtain a migration stacking result of a cannon set, and a final migration result is obtained by filtering false appearances on a wave field path. The earthquake prestack migration imaging method can obtain migration imaging in a key target area fast and can be widely applied to various oil gas exploration processes.

Description

Technical field [0001] The invention relates to an underground structure imaging method, in particular to a seismic pre-stack migration imaging method used in the field of oil and gas exploration. Background technique [0002] Seismic exploration is one of the most important methods in the field of oil and gas exploration. The seismic wave data obtained by seismic exploration needs to undergo a series of processing to finally obtain the seismic profile reflecting the information of the underground structure, and the seismic migration imaging technology is the final process of seismic data processing. An important part of obtaining a seismic imaging profile. With the needs of the oil and gas exploration situation and the development of computer software and hardware, seismic migration imaging technology has been updated accordingly. Seismic migration imaging technology has experienced from manual migration to computer digital migration, post-stack migration to pre-stack migration ...

Claims

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Application Information

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IPC IPC(8): G01V1/28
Inventor 刘伊克胡昊常旭王一博
Owner INST OF GEOLOGY & GEOPHYSICS CHINESE ACAD OF SCI
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