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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: 2015-03-04
INST OF GEOLOGY & GEOPHYSICS CHINESE ACAD OF SCI
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

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 migration method are affected due to the complexity of its own algorithm, difficulty in selecting initial parameters, and the diversity of calculation strategies.

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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Embodiment 1

[0041] like image 3 Shown is the marmousi longitudinal wave velocity model released by the French Oil and Gas Research Center. This velocity model has a complex structure and is a classic model for verifying the migration algorithm. like Figure 4 As shown, it is the result of the present invention on marmousi (Mamosi) shot record offset, which is consistent with the structure of the velocity model, which proves the feasibility of the present invention.

Embodiment 2

[0043] like Figure 5 As shown, it is a depth-domain velocity model in a certain sea area, which has obvious velocity depressions and high-steep boundaries.

[0044] like Image 6 , Figure 7 As shown, from the migration result obtained by using the present invention to perform migration imaging processing on the actual data and the result obtained by using the conventional time domain kirchhoff prestack migration method, it can be seen that the method of the present invention and the conventional time domain kirchhoff Compared with the method, the stratum homing obtained is more accurate, and the result obtained by the present invention is the result in the depth domain, which can more accurately reflect the geological structure information of the region.

[0045] like Image 6 , Figure 8 As shown, from the migration result obtained by using the present invention to perform migration imaging processing on the actual data and the result obtained by using the conventional ...

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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 go through a series of processing to finally obtain the seismic section reflecting the information of underground structure. Seismic migration imaging technology is the final step in the process of seismic data processing. It is an important link in obtaining seismic imaging sections. With the needs of oil and gas exploration 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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Patent Type & Authority Patents(China)
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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