Abstract— Eugene Initial reservoir pressures from well test information were found to be higher than the calculated hydrostatic pressures. Three wells in Block 276 P1-sand had higher observed pressures than what was expected, implying pore pressures greater than anticipated. It is thought that under compaction in shaly sand and thermal dissipation from salt diapirs are the main reasons causing over pressurization. Both effects have been studied and under compaction was found to be the dominant mechanism causing pore overpressure. Transgressive shale in P1-sand, resulting from ocean transgression, acted as plastic barriers; thereby, negating the transfer of lithostatic load to deeper formations. This has resulted in constant porosities with respect to depth. A developed COMSOL multiphysics model has also indicated that temperature effects from underlying salt diapers have also affected pore pressure and that pore over pressurization by conduction was found to range from 3 – 15%.
Keywords— Eugine Island, transgressive shale, over pressure.
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