A ''fractured reservoir'' is one in which naturally occurring fractures either have or are predicted to have a significant effect on reservoir fluid flow in the form of (1) increased reservoir [[permeability]], (2) increased [[porosity]], and/or (3) increased permeability anisotropy. Four basic types of reservoir fractures can be defined ([[:file:evaluating-fractured-reservoirs_fig1.png|Figure 1]]):
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A ''fractured reservoir'' is one in which naturally occurring fractures either have or are predicted to have a significant effect on reservoir fluid flow in the form of (1) increased reservoir [[permeability]], (2) increased [[porosity]], and/or (3) increased permeability [http://wiki.seg.org/wiki/Dictionary:Anisotropy anisotropy]. Four basic types of reservoir fractures can be defined ([[:file:evaluating-fractured-reservoirs_fig1.png|Figure 1]]):
{{quotation|''Type 1''—Provide the essential porosity and permeability to the reservoir
{{quotation|''Type 1''—Provide the essential porosity and permeability to the reservoir