Abstract— Eugene Island (EI) 276 fields presents an interesting case study of overpressure caused by uncompacted porosity, in addition to heat. Mechanics of sand deposition, transgressive shale, surrounding faults, overlying shale barriers and underlying salt diapirs have caused temperature anomalies in the P1-sand. Plio-Pleistocene sandstone reservoirs are supplied with mature hydrocarbons by migration of fluids from overpressured shales upwards along an active fault system. The heat carried by climbing fluids and the existence of highly conductive salt diapirs generate strong temperature variances disturbing the entire mini-basin. A COMSOL Multiphysics thermal simulation model has been developed to duplicate temperature variation in well #12, drilled in the proximity of a fault and a salt diapir. Recorded temperatures show a variation in the order of 42 oF across a shale barrier separating the reservoir from top formation. Heat conduction originating from the salt dome was found to be the dominant heat transfer mechanism, transgressive shale and shale barriers contributed to entrapment and led to overheating.
Keywords— Eugine Island, thermal analysis, heat transfer, temperature distribution.
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