![]() Reservoir performance is controlled by sedimentary facies, lithology and/or geometryĭetermine sedimentary characteristics and origin of facies through core description and construct predictive models for lateral variability and heterogeneity of reservoir units Table 1 Problems and approaches to evaluating tight gas reservoirs Reservoir Formation Problem Type 4-Impart no positive reservoir quality but create strong reservoir anisotropy and inhomogeneity Īnticipated exploration and development problems associated with these four reservoir types are summarized in Table 1 and Table 2. Type 3-Provide a permeability assist to an already producible reservoir ![]() Type 2-Provide the essential permeability Type 1-Provide the essential porosity and permeability to the reservoir Four basic types of reservoir fractures can be defined ( Figure 1): 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.
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