Full waveform inversion gradient pretreatment method based on model smoothing algorithm

A technology of full waveform inversion and smoothing algorithm, applied in seismic signal processing, geophysical measurement, measuring devices, etc., can solve problems such as interference gradient preprocessing accuracy, reduce the influence of reflected waves and multiple waves, improve accuracy, The effect of enhancing the effect
CN107894618AActive Publication Date: 2018-04-10OCEAN UNIV OF CHINA
4 Cites 11 Cited by

Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
OCEAN UNIV OF CHINA
Publication Date
2018-04-10

Smart Images

  • Figure 1
    Figure 1
  • Figure 2
    Figure 2
  • Figure 3
    Figure 3
Patent Text Reader

Abstract

The invention provides a full waveform inversion gradient pretreatment method based on a model smoothing algorithm and belongs to the field of seismic waveform inversion. The method comprises the following steps: in each iterative inversion, to begin with, carrying out smoothing on a velocity model obtained through iteration; then, based on the smoothed velocity model, carrying out simulation through acoustic wave equation finite difference simulation technology to obtain positive time wave field energy of shot point source wavelets and inverse time wave field energy with actual seismic records being disturbance; and finally, carrying out gradient pretreatment by utilizing the positive time wave field energy and the inverse time wave field energy. Model experiment results show that the method can effectively reduce the influence of reflected waves and multiple waves in wave field energy calculation; gradient pretreatment precision is improved; and full waveform inversion effect is improved obviously.
Need to check novelty before this filing date? Find Prior Art

Description

technical field

[0001] The invention belongs to the field of seismic waveform inversion, in particular to a gradient preprocessing method for full waveform inversion based on a model smoothing algorithm. Background technique

[0002] In the 1980s, Tarantola et al. first proposed a time-domain full waveform inversion method based on the least square theory. This method makes full use of the travel time, amplitude, and phase information of the measured seismic records to reconstruct the velocity structure of the underground medium. The accuracy of an ideal observation system can reach the order of wavelength, so full waveform inversion is considered to be an important method that can further improve the oil and gas exploration capabilities of seismic exploration, and is expected to play an important role in future oil and gas exploration.

[0003] The full waveform inversion uses the least square functional of the error between the theoretical seismic record and the actual sei...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More