Reservoir Characterisation for Field Development, Albertine Graben, East African Rift System

Amusugut, Catherine P.¹; Ochan, Andrew ¹
(1) Petroleum Exploration and Production Department, Ministry of Energy and Mineral Development, Entebbe., Uganda.

The Albertine Graben forms the northern-most part of the western arm of the East African Rift System .The Graben stretches from the border between Uganda and Sudan in the north to Lake Edward in the south, a total distance of over 500 km with a variable width of 45 km, and straddles both the Democratic Republic of Congo and Ugandan borders.

A number of oil and gas discoveries in the Albertine Graben are currently under appraisal in preparation for production. To plan optimal well placement for sustainable production, a comprehensive reservoir characterisation is therefore necessary.

This study makes use of a diverse data set including 2D and 3D seismic, wireline logs, core, pressure data and well test data to generate a number of geological predictions in order to assess the uncertainty in describing the reservoir.

Facies association were described for two fields i.e. Kasamene and Nzizi and flow units defined based on log and core plug permeability. Static geological models were then created to represent the uncertainty in distribution of facies and rock properties in the fields through generation of a number of realizations by use of stochastic modelling methods with petrel software. Reservoir connectivity was then investigated by integrating pressure and well test data.

AAPG Search and Discovery Article #90135©2011 AAPG International Conference and Exhibition, Milan, Italy, 23-26 October 2011.