METHOD OF ESTIMATING SUBSURFACE PARAMETERS WITH FULL WAVE FIELD INVERSION AND REVERSE-TIME MIGRATION Russian patent published in 2015 - IPC G01V1/28 

FIELD: physics; geophysics.

SUBSTANCE: invention relates to geophysics and can be used to process seismic data. Disclosed is a method of converting seismic data to obtain a subsurface model of bulk modulus or density. The gradient of an objective function is calculated (103) using the seismic data (101) and a background subsurface medium model (102). The source and receiver illumination coefficients are calculated (104) in the background model. The seismic resolution volume is calculated (105) using the velocities of the background model. The gradient is converted (106) into the difference subsurface model parameters using the source and receiver illumination coefficients, seismic resolution volume and the background subsurface model. Said values are scalable coefficients, used to compensate seismic data after migration by reverse time migration, which can then be related to a subsurface bulk modulus model. For iterative inversion, the difference subsurface model parameters (106) are used (107) as preconditioned gradients.

EFFECT: high accuracy of obtained data.

21 cl, 7 dwg