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Seismic data migration imaging method

A technology of migration imaging and seismic data, applied in the field of seismic exploration, it can solve the problems of Checkpoint technology such as large amount of calculation, unacceptable storage amount, and impact on imaging quality.

Active Publication Date: 2018-08-03
CHINA UNIV OF PETROLEUM (EAST CHINA)
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Problems solved by technology

These technologies have their own limitations: Checkpoint technology has a large amount of calculation; random boundary wavefield reconstruction technology introduces additional random noise to affect the imaging quality; effective boundary storage technology is still unacceptable for 3D data.

Method used

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specific Embodiment approach 1

[0130] figure 2 is the two-dimensional sag migration velocity model diagram provided in this embodiment, where, figure 2 (a) is the depth domain model, figure 2 (b) is the vertical time domain model. Set 31 explosion sources on this model, the source wavelet is set as Reck wavelet, the main frequency is 30 Hz, the initial source point is at (0m, 0m), the shot interval is 200m, and the receiving observation system on both sides of the middle shot is adopted , the maximum unilateral offset is 3000m, the track spacing is 10m, the time step is 1ms, and the recording time length is 2s.

[0131] image 3 Yes figure 2 Single-shot seismic records of the 2D depression model shown, where, image 3 (a) is the single-shot seismic record obtained by the conventional method, image 3 (b) is a single shot seismic record obtained by the method of the present invention. from image 3 It can be seen that the method of the present invention can obtain seismic records with the same pr...

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Abstract

The invention discloses a seismic data migration imaging method. The method includes acquiring seismic data for migration imaging, observation system parameters and a migration speed model and migration parameters; converting the migration speed model to a vertical time domain from a depth domain; converting an isotropic medium first order speed-stress sound wave equation to the vertical time domain from the depth domain; acquiring a speed-stress optimization operator of a moment corresponding to each shot; utilizing the obtained speed-stress optimization operator of the moment corresponding to each shot to perform focus wave field reconstruction and acquiring a focus wave field of each moment of said shot; acquiring a demodulator probe wave field of each moment of each shot; acquiring a single shot migration section corresponding to each shot; superposing the single shot migration sections of all the shots and acquiring a final migration section. According to the invention, the calculation volume and the storage volume of a conventional three-dimensional reverse time migration method can be reduced effectively and the operation efficiency can be improved.

Description

technical field [0001] The invention belongs to the technical field of seismic exploration, in particular to a seismic data migration imaging method. Background technique [0002] Seismic data reverse time migration imaging technology is based on two-way wave theory, not limited by dip angle and lateral velocity, overcomes the limitations of traditional ray-like migration and one-way wave migration methods, and has a good performance in imaging complex structural oil and gas reservoirs application prospects and economic benefits. [0003] For the reverse time migration method, the storage of the source wave field is the bottleneck restricting the practical application of the method. In order to overcome this storage problem, several methods and technologies commonly used in the industry are: Checkpoint technology, random boundary wave field reconstruction technology, and effective frontier storage technology. These technologies have their own limitations: Checkpoint techno...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01V1/28
Inventor 谷丙洛段沛然李振春
Owner CHINA UNIV OF PETROLEUM (EAST CHINA)
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