Challenging Appraisal of Tight Palaeozoic Reservoirs in Algeria; Fault and Fracture Network Analyses and Modeling

Abstract

Summary A fully integrated multidisciplinary workflow has been applied using up to date technologies in order to prove deliverability of already discovered and proven resources, and explore for new (Palaeozoic and basement) reservoir levels and other prospects in the areas of Tinrhert (Ilizzi-Berkine Basin) and M’Sari Akabli (Ahnet Basin) Blocks. Extensive analyses of vintage 2d and 3d seismic data and previously drilled wells has been performed over the last 4 years. New 2d seismic data were acquired and vintage 3d seismic data have been reprocessed in various phases. The multiscale workflow presented shows the results of seismic mapping and depth modeling, seismic attribute analyses, well log correlation, image log analyses including stress field analyses, core data and remote sensing data analyses. Completely new approaches are outlined regarding the multiscale treatment of remote sensing data regarding fractures and faults, and regarding data driven DFFN modeling in the 3d domain. The results constitute a solid backbone for the planning of future appraisal wells in this complex and challenging geological environment.