1. Volumetric, when there is an aquifer adjacent to the site (site closed).
2. No volumetric. The volume of oil available is reduced by the intrusion of water from a nearby aquifer.
Table 1.1. Characteristics of different production mechanisms 
Fig. 1.1 Influence of the mechanisms of production in oil recovery 
From: Fundamentals of Reservoir Engineering - Freddy H. Escobar, Ph.D.
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