The mesoscale structures (centimetres up to several metres sized structures) associated with the injection complexes have important effects on reservoir quality and performace. Some the mesoscale structures may act as permeability barriers while others can be preferential pathways for fluid migration with obvious effects on the vertical and horizontal permeability. <br>Field investigation on reservoir scale analogues demonstrates that these structures may occur in well-defined associations and that their style, geometry and distribution are related to the type and morphology of the architectural elements with which they are associated and, on a larger scale, to the internal and external geometry of the injection complex. <br>Mesoscale structures are recognisable both at outcrop and in core and provide insights on the main genetic processes. The structures can form or be modified during the injection process and/or during the following compaction and diagenesis of the intruded sands. <br>


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