1. Introduction
Oil recovery in naturally fractured reservoirs is typically quite
low. In medium-permeability to high-permeability naturally fractured carbonate reservoirs, in particular, oil recovery is often less
than 15% of the oil-in-place. In such cases, it is generally difficult to
recover the oil from the matrix due to fingering, where the injected flooding solution bypass through easy paths available in the
natural fractures. Water flooding is often used to displace oil from
the carbonate reservoir but generally it is only effective in the
presence of the higher permeability natural fractures