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

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

Inactive Publication Date: 2016-04-06
INST OF GEOLOGY & GEOPHYSICS CHINESE ACAD OF SCI
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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 anisotropy elastic wave numerical simulation method and system
  • A three-dimensional anisotropy elastic wave numerical simulation method and system
  • A three-dimensional anisotropy elastic wave numerical simulation method and system

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Experimental program
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Effect test

Embodiment 2

[0068] In Embodiment 2, on the basis of Embodiment 1, the 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 use the absorption boundary method to determine the calculation area boundary, and simulate the wave propagation in the underground medium in the calculation area;

[0070] Step 4.2: Divide all the calculation areas, exchange the boundary data of adjacent divisions, obtain simulated elastic wave data, and complete the 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 one of Embodiments 1-3, the data exchange in step 4.2 specifically includes:

[0073] Decompose the region along the axis where the data change at the boundary of the computing region in the media model is the slowest to obtain multiple partitions. All partitions are allocated to multiple GPUs. Each partition performs calculations on a GPU independently; every two adjacent partitions The boundary data is exchanged.

[0074] In this embodiment, further, the calculation boundary data of each computing node at each time is implemented using GPU-Direct technology to exchange data as follows:

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

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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, and belongs to the field of geophysical prospecting. Background technique [0002] The numerical simulation of seismic waves 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, conventional three-dimensional acoustic wave equations and elastic wave isotropic numerical simulations have been widely used in various geophysical fields such as numerical simulation, imaging, and inversion. However, there are still many researches on how to effectively implement large-scale acquisition methods (such as wide-azimuth acquisition) and complex anisotropic media (such as horizontal and transverse isotropic HTI or orthotropic three-dimensional elastic wave field numerical simulation). The big challenge is not widely used in practical applications. In add...

Claims

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Application Information

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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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