Abstract
Lacustrine-fan deltas feature high reservoir-quality lithounits that are critical targets to hydrocarbon exploration and development. However, depicting their intricate sedimentary architectural elements is still challenging due to complex stacking-patterns and limited examples. In this study, both 3D-static geocellular reservoir modeling and 1D-basin modeling approaches were combined as an established effective workflow that is capable of efficiently delineating reservoir-heterogeneities and confirming hydrocarbon-charging. This integration was for the purpose of unlocking the ultimate petroleum potential of fluvio-lacustrine units, Nubia Formation, in the southwest of the Gulf of Suez rift (West Esh-ElMallaha Concession, Egypt). Pixel-based stochastic-simulation was applied, constrained by an established depositional-model developed after adequate integrated-facies analysis, upon geocellularly modeling rock and fluid properties of Nubia reservoir intervals; utilizing several key-information scales (seismic-profiles, well-logs). The results reveal a lowstand-transgressive systems tract encompassing fluvio-lacustrine depositional-systems subdivided into eight facies-associations, of which fluvial-channels and deltaic mouth bars represent significant reservoir-quality facies. Given efficient reservoir-quality, mouth sand-bars deserve special consideration, and testing, while running further oilfield development-endeavours and investigating similar-settings.
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