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A three-dimensional anisotropic elastic wave numerical simulation method and system

A numerical simulation, three-dimensional and isotropic technology, applied in the field of geophysical exploration, can solve the problems of high cost and not widely used, achieve the effect of low hardware cost, optimize communication bottleneck, and improve overall computing performance

Inactive Publication Date: 2017-09-19
INST OF GEOLOGY & GEOPHYSICS CHINESE ACAD OF SCI
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  • Abstract
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  • Application Information

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Problems solved by technology

However, there is still a lot of research on how to effectively realize the numerical simulation of 3D elastic wave fields in large-scale acquisition methods (such as wide-azimuth acquisition) and complex anisotropic media (such as horizontal transverse isotropy HTI or orthotropic anisotropy). Big challenge, not widely used in practical applications
In addition, conventional CPU-based large-scale numerical simulation of 3D acoustic waves and elastic waves usually requires a large number of dedicated cluster computing resources.
It is very expensive both in terms of hardware cost and computing energy consumption

Method used

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  • A three-dimensional anisotropic elastic wave numerical simulation method and system
  • A three-dimensional anisotropic elastic wave numerical simulation method and system
  • A three-dimensional anisotropic elastic wave numerical simulation method and system

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Embodiment 2

[0068] In embodiment 2, on the basis of embodiment 1, said step 4 specifically includes the following steps:

[0069] Step 4.1: Determine the calculation area of ​​each grid point according to all wave field values, and determine the boundary of the calculation area by means of absorption boundary, and simulate the propagation of waves in the underground medium in the calculation area;

[0070] Step 4.2: Partition all calculation areas, exchange data on the boundary data of adjacent partitions, obtain simulated elastic wave data, and complete elastic wave numerical simulation.

Embodiment 3

[0071] In Embodiment 3, on the basis of Embodiment 1 or 2, the boundary data in step 4.2 adopts GPU-Direct technology for data exchange.

Embodiment 4

[0072] In embodiment 4, on the basis of any embodiment of embodiment 1-3, the data exchange in the step 4.2 specifically includes:

[0073] The area is decomposed along the slowest axis of calculation area boundary data in the media model to obtain multiple partitions, and all partitions are allocated to multiple GPUs, and each partition performs calculations independently on one GPU; every two adjacent partitions The border data are then exchanged.

[0074] In this embodiment, further, the GPU-Direct technology is used to perform data exchange on the calculation boundary data of each calculation node at each moment. The specific implementation is as follows:

[0075] When dealing with solving large-scale 3D models, limited global memory makes it impossible for a single GPU device to store the entire model mesh. To this end, our algorithm must extend CUDA codes to run on multi-GPU devices and multi-node heterogeneous architectures to make full use of GPU computing power for h...

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Abstract

The invention relates to a three-dimensional anisotropy elastic wave numerical simulation method and system. The method comprises the following steps: 1, a medium model is established to carry out grid discretization on the medium model to obtain a plurality of grid points; 2, a seismic source function is calculated, and a pressure value at each grid point is calculated according to the seismic source function; 3, a three-dimensional anisotropy elastic wave equation is converted into a propagation equation, and the pressure value at each grid point is taken into the propagation equation as substitutes to conduct calculating to obtain a wave field value at each moment; and 4, according to the wave field value, a calculating area of each grid point is determined; area division is carried out; and data exchange is carried out on divided area boundary data to complete elastic wave numerical simulation. According to the invention, acceleration of three-dimensional elastic wave numerical simulation under a complex medium is realized through utilization of a GPU; a realization scheme of accelerating data transmission through utilization of GPU Direct technology is realized; a large amount of data copying from a CPU to the GPU and from the GPU to the CPU is avoided; and communication bottleneck optimization is realized.

Description

technical field [0001] The invention relates to a three-dimensional anisotropic elastic wave numerical simulation method and system, belonging to the field of geophysical exploration. Background technique [0002] Seismic wave numerical simulation is based on the theory of seismic wave propagation in underground media, and has been widely used in exploration seismology and natural seismology. At present, the conventional three-dimensional acoustic wave equation and elastic wave isotropic numerical simulation have been widely used in various geophysical fields such as numerical simulation, imaging, and inversion. However, there is still a lot of research on how to effectively realize the numerical simulation of 3D elastic wave fields in large-scale acquisition methods (such as wide-azimuth acquisition) and complex anisotropic media (such as horizontal transverse isotropy HTI or orthotropic anisotropy). Big challenge and not widely used in practical applications. In addition...

Claims

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Application Information

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