Thursday, September 5, 2019

Fractured Reservoirs

  • Fractured reservoirs are reservoirs in which production and recovery is influenced to a greater or lesser extent by fractures. They can be subdivided into four different types (cf. Nelson , 2001; Allan & Qing Sun , 2003)
  • The variability in fracture network interconnectedness, and in the architecture and properties of the matrix, are the basic reasons that fractured reservoirs show a large variety of behaviors during hydrocarbon production. These large uncertainties make the appraisal, development and management of fractured reservoirs difficult. Failure to asses uncertainties properly leads to missed opportunities and low hydrocarbon recovery.
  • The special nature of fractured reservoirs lies in the interaction between, the (relatively) high pore volume , low permeability matrix (the storage domain) and the low pore volume, high permeability fracture system (the flow domain). This interaction is a function of matrix architecture and fracture network geometry, but also the mechanisms and physical processes that control the transfer of hydrocarbons from the matrix to the fracture network. The initial and developing stress state and the presence or absence of an aquifer also influence performance. 

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