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A Staggered Grid 3D Seismic Prestack Reverse Time Migration Imaging Method Based on Small GPU Storage

A pre-stack reverse time migration and staggered grid technology, applied in seismic signal processing and other directions, to achieve the effect of reducing storage capacity, increasing operation speed, reducing usage and data exchange

Active Publication Date: 2011-12-07
SINO GEOPHYSICAL CO LTD
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Problems solved by technology

The disadvantage of reverse time migration is the large amount of calculation. However, with the development of parallel computing technology in recent years, the use of GPU parallel computing technology can realize three-dimensional pre-stack reverse time migration. possible

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  • A Staggered Grid 3D Seismic Prestack Reverse Time Migration Imaging Method Based on Small GPU Storage
  • A Staggered Grid 3D Seismic Prestack Reverse Time Migration Imaging Method Based on Small GPU Storage
  • A Staggered Grid 3D Seismic Prestack Reverse Time Migration Imaging Method Based on Small GPU Storage

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Embodiment Construction

[0022] The 3D seismic prestack reverse time migration imaging method based on GPU small storage capacity staggered grid of the present invention is specifically implemented as follows:

[0023] (1) Read the pre-stack seismic gather data and store it in the GPU operation cache;

[0024] (2) Given the source record, solve the wave equation;

[0025] (3) Calculate the forward wave field and store it on the disk array by using the checkpoint method;

[0026] (4) Arrange the seismic records in reverse time;

[0027] (5) Calculate the wave field at the receiving point propagating in reverse time;

[0028] (6) Apply new Laplace imaging conditions to the calculated forward wave field and receiving point wave field to obtain the final 3D seismic prestack reverse time depth migration imaging results of complex structures.

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Abstract

A staggered grid 3D seismic prestack reverse time migration imaging method based on GPU small storage capacity is a very important technology for 3D prestack depth migration imaging of complex structures. The reverse time migration method based on the two-way wave equation has been realized, which can accurately image the rotary wave and the large-angle reflected wave, and at the same time solve the problem of the large amount of calculation of this method. Utilizing parallel computing technology based on GPU hardware, staggered grid difference format, checkpoint storage and other technologies, and relying on Laplace imaging conditions, the pre-stack reverse time migration imaging of 3D seismic data is realized, which greatly shortens the computing time. The efficiency has been increased hundreds of times, and the imaging accuracy has been significantly improved.

Description

technical field [0001] The present invention relates to three-dimensional seismic data pre-stack depth migration imaging technology, specifically a three-dimensional pre-stack depth migration imaging for complex structures, which realizes the reverse time migration method based on the two-way wave equation, which can make the rotary wave and Accurate imaging of large-angle reflected waves. technical background [0002] In the case of complex structures, pre-stack depth migration technology is an indispensable and important tool. The reverse time migration method using the two-way wave equation can simultaneously image the rotating wave and the reflected wave, the imaging angle is not limited, and the amplitude is accurate. The disadvantage of reverse time migration is the large amount of calculation. However, with the development of parallel computing technology in recent years, the use of GPU parallel computing technology can realize three-dimensional pre-stack reverse tim...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01V1/28G01V1/36
Inventor 孙沛勇周锦明
Owner SINO GEOPHYSICAL CO LTD
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