Layered continuation imaging method in wave equation prestack migration

An imaging method and pre-stack migration technology, which is applied in seismic signal processing and other directions, can solve the problems of low utilization of parallel nodes in memory requirements, large occupied content, inability to perform operations and migration calculations, etc.

Active Publication Date: 2013-04-24
CHINA PETROLEUM & CHEM CORP +1
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Problems solved by technology

[0003] In order to solve the technical problem that the non-hierarchical continuation imaging method in the prior art occupies too much content and cannot perform operations and migration calculations, the present invention develops a layered continuation imaging in wave equation prestack migration method
Aiming at the problem of excessive memory requirement and low utilization rate of parallel nodes in the conventional wave equation pre-stack migration method, the present invention automatically adjusts the memory requirement for migration calculation according to the available memory space of the computing node, so as to achieve a balance between memory expenditure and CPU operation, Make full use of the parallel computing capability of computer clusters to realize prestack migration imaging of large-scale seismic data

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Embodiment 1

[0105] figure 2 and image 3 respectively represent embodiment 1 and embodiment 2

[0106] Among them, in Example 1, the full coverage area of ​​a certain data in the south is 54.17km 2 , the bin size is 25m×25m, the sampling time is 6s, the sampling interval is 2ms, the number of sampling points is 3000, and the data volume of CMP gather is 70G. Using the non-hierarchical overall continuation imaging method, the memory requirement of the main process is 2457M, and the memory requirement of each slave process is 1006M. Using the layered continuation imaging method of the present invention, the maximum available memory space of the slave process is set to 350M, and the migration program divides the imaging depth into 3 layers, and each layer has a thickness of 1000 sampling points. The layered continuation imaging result is correct, figure 2 is the imaging section of a line obtained by using the present invention.

Embodiment 2

[0107] Example 2, a certain high-density data in the west, the bin size is 7.5m×7.5m, the sampling time is 7s, the sampling interval is 2ms, and the number of sampling points is 3500. To an area of ​​30km 2 Part of the seismic data is processed by wave equation prestack migration, the processing range is 360 (line) × 1450 (CDP), and the imaging depth is 3000 points. Using the non-hierarchical overall continuation imaging method, the memory requirement of the main process is 12.5G, and the memory requirement of each slave process is 5.83G. Due to the large memory requirement, a computing node with 8 cores and 16G memory can only use 2 cores for biasing. For shift computing, the utilization rate of parallel nodes is very low. Using the layered continuation imaging method of the present invention, in order to make all 8 cores of a node participate in the calculation, the maximum available memory space of the slave process is set to 1.6G, then the offset program divides the imaging...

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Abstract

The invention discloses a layered continuation imaging method in a wave equation prestack migration. Firstly, according to a node memory size, layering is performed on an imaging space. Then, starting from first single plane wave data, continuation and imaging operations are successively performed on the each single plane wave data till single frequency data continuation and imaging of the each layer of the single plane wave are completed. An imaging result is output after the continuation and imaging of all the single plane waves are finished. According to the invention, aiming at problems that memory requirement is large by using a conventional wave equation prestack migration method and a parallel node utilization rate is not high, the memory requirement of migration calculation is automatically adjusted through calculating available memory space of the node, and memory cost is balanced with CPU operation. A parallel calculating capability of a computer cluster is fully used and prestack migration imaging of large-scale earthquake data is realized.

Description

technical field [0001] The invention belongs to a three-dimensional wave equation pre-stack migration imaging processing method, aims at the problems of excessive memory requirements and low parallel node utilization in conventional methods, involves seismic pre-stack migration imaging and high-performance parallel computing, and can be applied to oil and gas exploration Seismic data imaging processing. Background technique [0002] 3D finite-difference wave equation prestack migration has the problem of excessive memory expenditure in the calculation process, especially in today's 3D seismic exploration, the amount of data collected is increasing, and memory problems have become a problem that plagues the practical use of wave equation prestack migration methods. Key factor. Assuming that there is a 3D work area with Nx points in the inline direction, Ny points in the crossline direction, Nτ points in the imaging depth, and Nω in the number of single-frequency complex data...

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Application Information

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IPC IPC(8): G01V1/28
Inventor 段心标方伍宝
Owner CHINA PETROLEUM & CHEM CORP
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