Efficient time domain full waveform inversion method

A full waveform inversion, time domain technology, applied in seismic signal processing and other directions, can solve problems such as limiting GPU parallel efficiency, and achieve the effect of reducing the number of simulations, improving computing efficiency, and reducing input and output

Active Publication Date: 2016-02-10
CHINA PETROLEUM & CHEM CORP +1
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Problems solved by technology

Moussa (2009) used GPUPU to study reverse time migration and showed that 91% of the running time is used for data transfer between CPU memory and GPU memory. This is because the source wave field at each time needs to be stored on the hard disk, which limits the parallelism of the GPU. due to efficiency

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  • Efficient time domain full waveform inversion method
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  • Efficient time domain full waveform inversion method

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Embodiment Construction

[0050] Below in conjunction with accompanying drawing, the present invention is described in further detail:

[0051] The invention provides an efficient time-domain wave equation full waveform inversion method based on seismic source phase encoding and multi-GPU parallel computing technology without data I / O, and provides an efficient processing means for high-precision velocity modeling of large-scale data.

[0052] Such as figure 1 Shown, the inventive method comprises:

[0053] The first step is to use random source polarity, random source location, and random source number three random schemes to randomly form super-shot sets of different frequency bands on the original observed seismic records;

[0054] details as follows:

[0055] MPI is used to input the original single-shot record and the original Reich wavelet in parallel, and the Wiener filter is used to filter the original single-shot record and the original Reich wavelet to obtain seismic single-shot records and...

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Abstract

The present invention provides an efficient time domain full waveform inversion method, belonging to the field of efficient, low storage, high precision and high speed modeling of petroleum seismography data. The efficient time domain full waveform inversion method comprises the following steps: (1) employing original seismic observation records to randomly form supper-shot gathers with different frequency bands through adoption of a source polarity randomizing scheme, a source position randomizing scheme and a source number randomizing scheme; (2) accelerating the forward modeling of high order staggered mesh finite differences of a sound wave equation system and an elastic wave system of the one-form basis of the time domain through adoption of a multi-GPU parallel computing technique on the basis of CUDA, and obtaining a supper-shot gather with the ifreq frequency band simulated by the GPU; and (3) simulating propagations with different seismic sources through multi-GPU nucleus and through adoption of the collaborative technology of the CPU and the GPU at the forward modeling, and storing boundary data of a seismic source wave field and all the wave fields at the last moment to a computer memory.

Description

technical field [0001] The invention belongs to the field of high-efficiency, low-storage, and high-precision velocity modeling of petroleum seismic exploration data, and specifically relates to an efficient time-domain full-waveform inversion method, aiming at the huge amount of calculation and massive amount required for time-domain full-wave field velocity modeling For storage problems, high-efficiency, high-resolution speed modeling is accomplished by using seismic source coding, parallel computing technology strategies combined with multiple GPUs, and effective boundary storage strategies without data I / O. Background technique [0002] Using pre-stack seismic wave data kinematics and dynamics information, full waveform inversion has the ability to reveal geological structures and lithological parameters under complex geological conditions, and is currently considered to be the most accurate velocity modeling technology. However, the realization of 3D full waveform inver...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01V1/28
Inventor 王杰王立歆方伍宝胡光辉孙晶梅王振宇尹力
Owner CHINA PETROLEUM & CHEM CORP
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