Paper submitted to SEG 4D Forum - Insight to Actions, by Mariana Gherasim, Guanghui Huang, Jaime Ramos Martinez, Carlos Calderon, Daniel Davies, David Cavalin, and Eddie Cho (TGS)
Summary
Time-lapse (4D) seismic data has proven over the years to be an important delivery for reservoir management, with significant influence on understanding the fluid movement and well planning. Advancements in seismic acquisition and processing have direct impact on seismic image resolution and interpretation. OBN data, due to their excellent 4D repeatability, are commonly used for time-lapse projects in both shallow and deep-water settings. Their full azimuth coverage and long offsets make them suitable for accurate velocity updates using full-waveform inversion (FWI) methods. Recently, multiparameter full waveform inversion (MP-FWI) that also estimates reflectivity has emerged as an enhancement to conventional imaging techniques, enabling the delivering high-resolution reflectivity models. In this paper, we apply MP-FWI to time-lapse shallow water OBN data. Results obtained using only a subset of the data set demonstrate enhanced reservoir definition and improved 4D signal fidelity compared with conventional imaging approaches.