Evolution of small-scale flow barriers in German Rotliegend siliciclastics

• DOI: 10.1144/sp435.3
• Publication Date: 2015-11-19T03:04:07Z
• Authors: Benjamin Busch; Rebecca Winkler; Keyvan Osivandi; Georg Nover; Alexandra Amann-H...; Christoph Hilgers
• Keywords: Geography & travel; info:eu-repo/classification/ddc/910; 910; ddc:910; 01 natural sciences; 0105 earth and related environmental sciences

Abstract Many siliciclastic reservoirs contain millimetre-scale diagenetic and structural phenomena affecting fluid flow. We identified three major types of small-scale flow barriers in a clastic Rotliegend hydrocarbon reservoir: cataclastic deformation bands; dissolution seams; bedding-parallel cementation. Deformation bands various orientations were analysed on resistivity image logs core material. They are mainly conjugates, can be used to validate seismically observable faults infer subseismic faults. Bedding-parallel seams related compaction post-date at least one set bands. cementation is accumulated coarser-grained layers depends the amount clay coatings. Apparent permeability data petrographical interpretation visualizes impact reservoir heterogeneity. Transmissibility multiplier calculations indicate small efficiency studied properties reservoir. reduce host-rock by maximum two orders magnitude. However, anisotropies inferred four The relative timing these barriers, as well assessment heterogeneities, basis for state-of-the-art prediction modelling.