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Seismic phase feature recognition waveform inversion method based on full convolutional neural network

A technology of convolutional neural network and waveform inversion, which is applied in the field of exploration seismic waveform recognition technology and deep learning, can solve the problems of slow convergence, non-convergence, waveform window accuracy and efficiency of inversion, etc., to improve convergence, The effect of improving inversion efficiency

Active Publication Date: 2020-09-29
NANJING UNIV +1
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Problems solved by technology

[0003] Purpose of the invention: In order to overcome the accuracy and efficiency of waveform window selection in each iteration of FWI, and help solve the problem of slow or even non-convergent inversion caused by periodic jumps

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  • Seismic phase feature recognition waveform inversion method based on full convolutional neural network
  • Seismic phase feature recognition waveform inversion method based on full convolutional neural network
  • Seismic phase feature recognition waveform inversion method based on full convolutional neural network

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[0036] Below in conjunction with accompanying drawing and specific embodiment, further illustrate the present invention, should be understood that these examples are only for illustrating the present invention and are not intended to limit the scope of the present invention, after having read the present invention, those skilled in the art will understand various aspects of the present invention All modifications of the valence form fall within the scope defined by the appended claims of the present application.

[0037] A waveform inversion method for phase feature recognition based on fully convolutional neural network, such as figure 1 As shown in Fig. 1, a full convolutional neural network window selection mechanism is added to the traditional full waveform inversion process to avoid cycle jumps, including the following steps:

[0038] Step 1. Obtain the actual observed seismic records as observed waveform data. Obtain earthquake training data samples, and use the traditi...

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Abstract

The invention discloses a seismic phase feature recognition waveform inversion method based on a full convolutional neural network. The method comprises the steps of: preliminarily screening a seismicwave time window through a conventional seismic facies screening method FLEXWIN, manually screening data with higher quality as a training set, building a full convolutional neural network, and training the full convolutional neural network through the training set; performing seismic phase identification and window division on seismic waveform data by using the full convolutional neural network;and comparing the waveform similarity between the theoretic and observed data in the windows, and screening the waveform meeting the fitting condition to perform waveform inversion. Through a full convolutional neural network seismic phase feature recognition technology, the problem of efficient waveform window pickup in waveform inversion is solved, the problem of periodic jump is effectively improved, and the convergence rate of waveform inversion is increased.

Description

technical field [0001] The invention relates to an exploration seismic waveform identification technology and a deep learning technology, and is especially suitable for solving the accuracy and efficiency problems of automatic data picking in waveform inversion. Background technique [0002] Modeling and inversion of seismic wave velocity has always been a core issue in geophysics. As a high-precision velocity modeling and inversion method, full waveform inversion (FWI) has become one of the research hotspots in geophysics and seismology. It performs inversion by fitting all the waveform information of the observed waveform data and the calculated data. Compared with other inversion methods, it can obtain a higher resolution subsurface medium structure. The full waveform inversion method has been widely used in petroleum and mineral resource exploration, global scale structure imaging and so on. The gradient calculation of the FWI method is realized by propagating the wave...

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Application Information

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IPC IPC(8): G06F17/10G06N3/04G06N3/08G01V1/30G01V1/28G01V1/36G01V1/24
CPCG06F17/10G06N3/084G01V1/303G01V1/282G01V1/36G01V1/247G06N3/045
Inventor 阮友谊江文彬奚成朋王文闯
Owner NANJING UNIV
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