Changes

{{quotation|1. ''A flow unit is a specific volume of a reservoir, which is composed of one or more [[reservoir quality]] lithologies and any nonreservoir quality rock types within that same volume, as well as the fluids they contain''.}}

{{quotation|1. ''A flow unit is a specific volume of a reservoir, which is composed of one or more [[reservoir quality]] lithologies and any nonreservoir quality rock types within that same volume, as well as the fluids they contain''.}}

Flow units are internally consistent, but not necessarily homogeneous, in terms of either geological or petrophysical properties. They may contain more than one reservoir quality lithology and they may include nonreservoir features such as shales and cemented layers. Petrophysical properties may correspond to those of lithofacies defined geologically. However, petrophysical similarities among lithofacies may indicate that those lithofacies should be grouped into a single flow unit if they are contiguous. Alternatively, petrophysical dissimilarities within a geologically defined lithofacies may dictate that subdivision of a single lithofacies into several flow units is warranted. A flow unit zonation differs in principle from a lithofacies zonation in that it integrates geological, petrophysical, and production data with the end purpose of describing fluid flow pathways in the reservoir, not the distribution of depositionally distinctive lithologies.

Flow units are internally consistent, but not necessarily homogeneous, in terms of either geological or petrophysical properties. They may contain more than one reservoir quality lithology and they may include nonreservoir features such as shales and cemented layers. Petrophysical properties may correspond to those of [[lithofacies]] defined geologically. However, petrophysical similarities among lithofacies may indicate that those lithofacies should be grouped into a single flow unit if they are contiguous. Alternatively, petrophysical dissimilarities within a geologically defined lithofacies may dictate that subdivision of a single lithofacies into several flow units is warranted. A flow unit zonation differs in principle from a lithofacies zonation in that it integrates geological, petrophysical, and production data with the end purpose of describing fluid flow pathways in the reservoir, not the distribution of depositionally distinctive lithologies.

{{quotation|2. ''A flow unit is correlative and mappable at the interwell scale''.}}

{{quotation|2. ''A flow unit is correlative and mappable at the interwell scale''.}}