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Pressure Regime and Hydrodynamic Study of Niger Delta Coastal Swamp: Implication for Hydrocarbon Recovery and Production

Abstract

The characteristics pressure regimes observed in Nembe creek, Akaso, Krakama and Adibawa oil fields in Coastal swamp of tertiary Niger Delta have been used to study hydrodynamic activities within the fields with a view of maximizing hydrocarbon production and improve reserves portfolio. This was accomplished by delineating the lithology and reservoir using appropriate well logs; constructing the pressure (Repeater Formation Test) – depth plots and Oil Water Contact (OWC) isopach structure maps constructed; computing the dip/tilt of the OWC computed; and appraising of production history of the wells in each field. The complex fault pattern in Nembe Creek has resulted in compartmentalized reservoir blocks with variable communication between blocks. Tilted oil water contact as a result of aquifer heterogeneity was also observed while the pressure regime was hydrostatic. In Akasoand Adibawafield, the measured pore pressure varied from hydrostatic, mild overpressure to hard over pressure regime. Pressure regression phenomenon involving alternating bands of hydrostatic pressure sand and overpressured shale was also observed in one of the wells in each field and has resulted to hydraulic communication and lateral drainage. This has enabled the production and escape of hydrocarbon in wells where pressure regression was observed through one of the adjoining wells in Akaso and Adibawa field respectively. In Krakama field, high overpressure gradient has resulted to tilted OWC.