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...

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Bibliographic Details
Main Authors WANG JIE, WANG LIXIN, FANG WUBAO, HE JIANBO, HU GUANGHUI
Format Patent
LanguageChinese
English
Published 30.03.2016
Subjects
CALCULATING
COMPUTING
COUNTING
DETECTING MASSES OR OBJECTS
ELECTRIC DIGITAL DATA PROCESSING
GEOPHYSICS
GRAVITATIONAL MEASUREMENTS
MEASURING
PHYSICS
TESTING
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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