Full waveform inversionmethod and system based on gradient processing
The invention discloses a full waveform inversion (FWI) method and system based on gradient processing. The method comprises a residual calculation step of determining a data residual according to calculation data and outdoor observation data obtained by the forward modeling of an initial velocity m...
Saved in:
Main Authors | , , , , |
---|---|
Format | Patent |
Language | Chinese English |
Published |
30.03.2016
|
Subjects | |
Online Access | Get full text |
Cover
Loading…
Summary: | The invention discloses a full waveform inversion (FWI) method and system based on gradient processing. The method comprises a residual calculation step of determining a data residual according to calculation data and outdoor observation data obtained by the forward modeling of an initial velocity model; a gradient calculation step of solving a gradient field according to a backward wave field of the data residual in the initial velocity model and a forward wave field obtained by forward modeling; a disturbance model computing steps of filtering the gradient field to obtain a velocity disturbance model with reserved stratum boundary information; and an updating step of updating the initial velocity model according to the velocity disturbance model. The method carries out low-pass filtering and adaptive filtering on the gradient in the FWI, suppresses random noise by means of the low-pass filtering, and recovers the boundary information lost in the low-pass filtering so as to achieve boundary fidelity. |
---|---|
Bibliography: | Application Number: CN20141416052 |