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Joint velocity inversion method based on passive source seismic waveform and reverse time imaging thereof

A seismic waveform and joint velocity technology, which is applied in seismology, seismic signal processing, geophysical measurement, etc., can solve the problem of low velocity model resolution

Inactive Publication Date: 2019-12-17
OCEAN UNIV OF CHINA
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Problems solved by technology

However, the resolution of the velocity model obtained by this imaging domain velocity inversion method based on the difference between the three imaging results is not high

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  • Joint velocity inversion method based on passive source seismic waveform and reverse time imaging thereof
  • Joint velocity inversion method based on passive source seismic waveform and reverse time imaging thereof
  • Joint velocity inversion method based on passive source seismic waveform and reverse time imaging thereof

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Embodiment Construction

[0066] In order to make the purpose and technical solution of the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings and examples.

[0067] Flow chart of the present invention, as figure 1 shown, including the following steps:

[0068] 1) Obtain observation data. Layout three-component seismographs on the ground to monitor passive source seismic data;

[0069] 2) Preprocess the observation data. Including denoising, identification and extraction of effective source events, separation of longitudinal waves and shear waves, and envelope extraction;

[0070] 3) Extract the seismic wavelet. Using high-order statistical methods to extract seismic wavelet s from observation data;

[0071] 4) Calculate the weight coefficient in the objective function. In the initial stage of the inversion iteration, the imaging domain inversion method based on the difference of reverse time imaging under diffe...

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Abstract

The invention, which belongs to the field of velocity modeling of passive source seismic detection, relates to a joint velocity inversion method based on passive source seismic waveform and reverse time imaging thereof. The method mainly comprises the following steps: step one, preprocessing seismic data and extracting seismic source wavelets; step two, calculating a reverse time continuation wavefield, and carrying out reverse time imaging and seismic source positioning; step three, calculating the difference between a theoretical seismic record and an observed seismic record; step four, establishing an objective function of an inversion speed; step five, on the basis of an adjoint state method, calculating a gradient of the objective function on model parameters as well as an updating direction and step length; step six, updating a longitudinal wave velocity model and a transverse wave velocity model; and step seven, determining whether iteration termination conditions are met or not; and if so, outputting a positioning result and the velocity models; and otherwise, returning to the step two. A high-resolution velocity model is obtained under the circumstance that the focus position is unknown.

Description

technical field [0001] The invention relates to a joint velocity inversion method based on passive source seismic waveform and reverse time imaging thereof, and belongs to the field of velocity modeling of passive source seismic detection. Background technique [0002] In traditional seismic exploration, seismic waves induced by natural earthquakes or underground micro-movements are often regarded as noise interference, which will be suppressed by various means during data processing. But seismic waves induced by passive sources also contain a lot of useful information and can be used to detect subsurface geological structures. Compared with active source seismic exploration, passive source seismic exploration has advantages such as no need for artificial seismic source, convenient construction, and continuous observation. It has strong application value in geological monitoring of oil and gas reservoirs, dams, and underground oil depots. [0003] Velocity models are the ba...

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Application Information

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IPC IPC(8): G01V1/28
CPCG01V1/282
Inventor 张建中李青峰杨华臣
Owner OCEAN UNIV OF CHINA
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