Relative seismic inversion

If seismic inversion data is available for the observed seismics, inversion should also be performed on the generated synthetic seismic data. A method previously named simpli (now si4ti) is used. This is a relative seismic inversion method, meaning that there is no need for a low-frequency model.

Further documentation of the method can be found on the GitHub homepage of si4ti.

YAML file section

As shown in Figure 1 below, all parameters controlling the relative seismic inversion have default values. However, revisiting these parameters may be beneficial, as they influence the inversion results by controlling the smoothness of the results in both lateral and vertical directions, as well as between seismic vintages.

## Section for relative seismic inversion
#______________________________________________________________________________________________________________________#
# seismic_inversion:
#  attribute: &inversion_attribute relai
#  path: &rel_ai_path ../../share/results/cubes
#  domain: [time]
#  d_syn_0: ../../sim2seis/output/seismic_forward/syntseis--d_syn0.sgy
#  rel_ai_0: ../../sim2seis/output/seismic_forward/syntseis--relai_0.sgy
#  d_syn_1: ../../sim2seis/output/seismic_forward/syntseis--d_syn1.sgy
#  rel_ai_1: ../../sim2seis/output/seismic_forward/syntseis--relai_1.sgy
#  remove_unused_files: True
#  inversion_params:
#      lateral_smoothing_4d: 0.05
#      damping_3d: 0.001
#      damping_4d: 0.001
#      lateral_smoothing_3d:  0.01
#      max_iter: 100
#      segments: 1
#  pickle_file_prefix: relai_diff

Figure 1: Parameters in the sim2seis configuration file related to seismic inversion.