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Home  >  Volume 36 (no2)

Reservoir Characterisation and Rock Volume Estimation Using 3D Seismic and Petrophysical Data in Bada Field, Niger-Delta Basin, Nigeria by Levi I. NWANKWO and Uche E. EZEBUIRO (pages 377-392)
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Reservoir characterization and estimation of reservoir rock volume was carried out in Bada Field, Niger-Delta basin of Nigeria using 3D seismic and composite well logs data. Petrophysical parameters were determined from well log analysis and seismic-to-well tie was used to identify the reservoir sands picked along the well on the seismic section. Hydrocarbon-water contacts were identified and the net pay was determined from well logs. Signal attributes- maximum amplitude maps and time slices of the envelope attribute from the seismic sections were used to examine the spatial distribution of hydrocarbons within a reservoir sand. The generated time and depth maps showed two major faults (growth faults) and other antithetic faults present in the field. Fourclosures or traps P1, P2, P3 and P4 were identified on each of the sands picked while wells situated in a closure were used for petrophysical analysis to minimize estimation errors. Reservoir sands were found to range from 2000 to 2625 m/s (6561.68 – 88612.20 ft/s). The porosity of reservoir sands, which ranged from 26 to 28%, was good to very good and their permeability, with average field range from 1328 to 2770.5 mD, was excellent.  The average hydrocarbon saturation range from 22.90 to 53.87%, with corresponding water saturation ranging from 34.0 to 77.11%. The reservoir rock volume was substantial- 496.9 and 2068.5 acre-ft for the P3 closure in Sands C and D respectively and can be exploited at profit.

Keywords: Envelope attribute, Closure, Characterisation, Niger-Delta, Nigeria