Naturally fractured reservoirs present a problematic type of oil and gas production target. It is not an exaggeration to say that big part of the world oil and gas reserves are concentrated in naturally fractured reservoirs (NFR).

Naturally fractured formations may have different genesis. Volcanic, metamorphic and sedimentary rocks undergo of fracturing and faulting as well while forming extensive and narrow system of highly conductive zones.

In this paper, we investigate and analyze core study results, drilling and completion in naturally fractured reservoirs; we demonstrate results of the well tests and interpret pressure build-up data. We draw conclusions about pressure transient behavior in naturally fractured formations and demonstrate a set of pressure build-up (PBU) drevative curves.

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