Storage method of LSQR algorithm-based frequency domain waveform inversion

A waveform inversion and frequency domain technology, applied in the storage field based on the LSQR method frequency domain waveform inversion, can solve the problems of large memory usage, poor computing efficiency, and high computer hardware requirements, achieving small memory usage and improved IO efficiency. , the effect of improving computational efficiency
CN105589833AInactive Publication Date: 2016-05-18SHAANXI ZHONGHAOYUAN HYDROPOWER ENG CO LTD
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
SHAANXI ZHONGHAOYUAN HYDROPOWER ENG CO LTD
Publication Date
2016-05-18
Estimated Expiration
Not applicable · inactive patent

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Abstract

The invention discloses a storage method of LSQR frequency-based domain waveform inversion. The method comprises the following steps: 1) establishing a frequency domain acoustic wave equation; 2) carrying out real number processing on an impedance matrix; 3) compressing and storing the impedance matrix; 4) solving the acoustic wave equation on the basis of an LSQR algorithm of GPU acceleration; 5) calculating related kernel functions in the GPU; 6) calculating a virtual focus, a gradient and a Hessian matrix after compression and storage; 7) calculating an approximate step length; and 8) realizing the frequency domain waveform inversion. Compared with the traditional method of solving the system of linear equations through an LU decomposition method, the method disclosed in the invention has the advantages of being small in memory usage, saving the memory overhead and improving the calculation efficiency by thousands of times under the same hardware condition.
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Description

technical field

[0001] The invention belongs to the technical field of full waveform inversion for seismic data processing, and relates to a storage method for frequency domain waveform inversion based on the LSQR method. Background technique

[0002] The full waveform inversion method has the potential to reconstruct the subsurface velocity structure and reveal complex subsurface structure and lithological details, which can be realized in both the time domain and the frequency domain. Compared with the time domain inversion, the frequency domain has the advantages of high calculation efficiency and flexible data selection. In the past ten years, the theory of frequency domain full waveform inversion has made great progress in wave field simulation methods and inversion frequency selection strategies. The frequency-domain full waveform inversion involves solving the problem of large sparse linear equations. The commonly used solution method is the LU decomposition method. ...

Claims

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