Abstract
Abstract Continuing reservoir management at mature stages often concentrates on delineating pockets of remaining mobile oil. This is becoming a major task for reservoir geologists and petrophysicists. Many old fields are coming up as investment targets for reactivation and there is general consensus that modem techniques can lead to additional recovery of between 10 and 20 percent. However, there are many pitfalls which can render an apparently attractive project into an economic failure. This paper will discuss the non-technical screening criteria related to reservoir architecture, accumulation condition and production history. Mobile remaining oil can be found in a number of predictable locations in reservoirs depending on their structural style and facies. Attic oil along faults is perhaps the most simple configuration but sizeable volumes of remaining oil can also occur as a function of reservoir stratification and lateral discontinuity. A systematic overview of the different types has been compiled based on structural or stratigraphic lateral continuity and vertical reservoir connectivity. This leads to four main types with some sub-groups for each of which screening criteria have been derived on the basis of field examples and models. The screening criteria specify minimum conditions which may lead to economic re-development with horizontal side-tracks from existing wells. In addition recommendations are given with respect to data gathering to confirni the presence of economically viable targets. P. 345
Published Version
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