US 12,112,106 B2
Media parameter-modified method for realizing an adaptive expression of an arbitrary discontinuous surface
Jian Cao, Beijing (CN); Shoudong Huo, Beijing (CN); Xuhui Zhou, Beijing (CN); Taikun Shi, Beijing (CN); Liang Huang, Beijing (CN); and Jiaru Zou, Beijing (CN)
Assigned to Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing (CN)
Filed by Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing (CN)
Filed on Aug. 3, 2021, as Appl. No. 17/393,317.
Claims priority of application No. 202110768611.0 (CN), filed on Jul. 7, 2021.
Prior Publication US 2023/0020158 A1, Jan. 19, 2023
Int. Cl. G06F 30/23 (2020.01); G01V 1/30 (2006.01); G06F 111/10 (2020.01)
CPC G06F 30/23 (2020.01) [G01V 1/30 (2013.01); G01V 2210/64 (2013.01); G06F 2111/10 (2020.01)] 5 Claims
OG exemplary drawing
 
1. A media parameter-modified method for realizing an adaptive expression of an arbitrary discontinuous surface, comprising following steps:
S1: importing an initial forward model, and the initial forward model includes a velocity and a density of vertical and horizontal waves, setting a seismic wavelet type and a main frequency parameter, and setting a space step and a time step according to initial forward model parameters;
S2: selecting the space step and the time step according to the initial forward model parameters; and setting a differential order-number and a seismic wavelet;
S3: starting a stepped discretization of a free surface of the initial forward model when a surface of the initial forward model fluctuates, and turning an irregular undulating ground into a regular stepped grid;
S4: using a media Parameter-modified method to correct a constitutive relationship and a density of non-horizontal points on the free surface;
S5: using a corrected constitutive relationship to replace an original constitutive relationship on the free surface, and an influence of the free surface introduced without correcting an original finite difference method code; and
S6: for generalized anisotropic media, including orthorhombic anisotropic media and triclinic anisotropic media, bringing the corrected constitutive relationship into a finite difference method code to introduce the influence of the free surface.