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A GPU reverse time migration method and system based on multi-stream optimization

A technology of reverse time migration and flow optimization, applied in the field of geophysical exploration to achieve the effect of improving efficiency

Inactive Publication Date: 2020-01-21
INST OF GEOLOGY & GEOPHYSICS CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, reverse time migration also has its own inherent disadvantages. Due to the need for a large number of finite difference calculations in reverse time migration, the reverse time migration algorithm has the defect of highly computationally intensive

Method used

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  • A GPU reverse time migration method and system based on multi-stream optimization
  • A GPU reverse time migration method and system based on multi-stream optimization
  • A GPU reverse time migration method and system based on multi-stream optimization

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Embodiment 1

[0034] Such as figure 1 As shown, the present embodiment proposes a GPU reverse time migration method based on multi-stream optimization, which is realized by the following process:

[0035] S1. Preprocess the original seismic data collected in the field to obtain high signal-to-noise ratio common shot point gather data and corresponding underground medium velocity model data.

[0036] S2. Perform reverse-time imaging processing on the seismic data, and use the first-level concurrent computing method to calculate the data loading kernel function, wavelet backpropagation kernel function and data backpropagation kernel function during the processing; use OpenMP to generate multiple CPU threads , each generated CPU thread corresponds to the corresponding data loading kernel function, wavelet backpropagation kernel function and data backpropagation kernel function through the CUDA stream.

[0037] S3. The imaging condition kernel function and the noise filter kernel function in t...

Embodiment 2

[0040] Such as figure 2 As shown, this embodiment proposes a GPU reverse time migration system based on multi-stream optimization, which includes:

[0041] Data acquisition module 1, used to acquire seismic data;

[0042] The first-level concurrent calculation module 2 is used to perform reverse-time imaging processing on seismic data, and to calculate the data loading kernel function, wavelet backpropagation kernel function and data backpropagation kernel function in the process of processing using a first-level concurrent calculation method

[0043] The second-level concurrent calculation module 3 is used to calculate the imaging condition kernel function and the noise filter kernel function in the process of reverse-time imaging processing of seismic data using a second-level concurrent calculation method;

[0044] The migration result generating module 4 is configured to obtain imaging results according to the calculation results of the first-level concurrent calculation...

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Abstract

The invention relates to a GPU reverse time migration method and system based on multi-flow optimization, relating to the field of geophysical exploration. The method comprises the following steps: acquiring seismic data; performing reverse time imaging processing on the seismic data, and calculating a data loading kernel function, a wavelet back-propagation kernel function and a data back-propagation kernel function during processing by adopting a primary concurrent calculation method; calculating an imaging condition kernel function and a noise filter kernel function in the reverse time imaging process on the seismic data are calculated by adopting a secondary concurrent calculation method; obtaining an imaging result according to the calculation results, and generating an imaging profile. The pre-stack reverse time migration calculation of the seismic data is accelerated by adopting a multi-flow parallel optimization strategy. The method not only can process ultra large-scale seismic data, but also can improve the migration processing efficiency.

Description

technical field [0001] The present invention relates to the field of geophysical prospecting. Background technique [0002] Prestack reverse time migration is one of the most practical migration imaging methods at present. It is a high-precision migration imaging method that can adapt to complex structures and can image folded waves, multiple waves, and prismatic waves. And there is no inclination limit. However, reverse time migration also has its own inherent disadvantages. Because a large number of finite difference calculations are required in reverse time migration, the reverse time migration algorithm has the disadvantage of high computational intensity. [0003] Nowadays, high-performance computing based on graphics processing unit (GPU) is becoming a rapidly developing technology, and it is widely used in high-intensity computing applications such as seismic imaging and seismic inversion, in order to reduce the burden caused by a large number of calculations. energ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01V1/28
CPCG01V1/28
Inventor 王一博薛清峰常旭
Owner INST OF GEOLOGY & GEOPHYSICS CHINESE ACAD OF SCI