Rapid 4D Seismic Insights for Reservoir Monitoring with Raw-Data Elastic Full Wavefield Inversion and Rock Physics Inversion

Abstract

Two major challenges we face with 4D seismic projects are: lengthy processing time, ranging from several weeks to several months for fast-track products and up to a year for full-track products to produce interpretable 4D seismic images, and the iterative time-consuming process of 4D interpretation and integration. In this paper, we address these challenges using 4D raw-data elastic full wavefield inversion (eFWI) for elastic property changes and 4D rock physics inversion for petrophysical property changes. Our approach, utilizing raw seismic data and High Performance Computing (HPC) with 4D eFWI, can produce high-resolution acoustic impedance and shear property changes within weeks of field data delivery. 4D rock physics inversion is then applied to estimate saturation and pressure changes in the reservoir, which are validated with well surveillance data and the estimated saturation/pressure changes from reservoir simulation models. We demonstrate these rapid turnaround 4D seismic workflows using a 4D OBN dataset from the Liza field in offshore Guyana, showcasing accelerated subsurface insights for improved reservoir management and opportunity generation.