To obtain a realistic subsurface image in the time domain, KIGAM performed anisotropic parameter analysis using sequential iterative updating of the velocity. We generated the ETA parameter (Fig. 1a) and anisotropic PSTM image (Fig. 1b) for long-offset data. To image subsurface structure accurately, we need a depth-domain velocity model and should process the seismic data in the depth-domain. Generally, the depth-domain velocity model (Fig. 2a) is converted from the time-domain RMS velocities and used for depth processing, however, the depth-domain processing with the converted velocity model does not yield accurate subsurface image since the converted velocity model is not accurate enough. To image subsurface structure accurately, KIGAM performed depth processing using a well-defined depth-domain velocity model (Fig. 2b) obtained by the migration velocity analysis (MVA) and full waveform inversion (FWI).
Contact: Woo Hyun Son (whson@kigam.re.kr)
Yong Hwan Joo (jooyh@kigam.re.kr)
