“A 3D geological modelling workflow is presented that tests the impact of fine-scale heterogeneities within a basin-floor lobe complex on reservoir connectivity. Capturing multiscale heterogeneities within deep-water stratigraphy can help to improve reservoir models, and therefore recovery factors. The use of outcrop analogues is a key tool within this process for gaining knowledge on detailed sedimentary architectures and facies relationships. The sand-rich submarine fan systems of the Tanqua depocentre, South Africa, allow a detailed study of individual submarine lobe deposits. Artificial injectors and producers were implemented at various locations in the system after which streamline analysis was performed.

The findings show that the lobe architecture model employed has a significant influence on the predictability of the breakthrough time. Differences in facies architecture and lobe-on-lobe amalgamation impact connectivity and macroscopic sweep efficiency, which influence production results. Channelised lobe areas are less predictable reservoir targets owing to uncertainties associated with channel-fill heterogeneities. The implementation of sedimentary detail and the use of realistic sedimentary concepts on the architectural scale are shown to be vital to understand reservoir connectivity and improve predictions of reservoir recovery.”


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