Average reservoir pressure in a naturally fractured reservoir is usually computed in a similar way with that of a conventional homogeneous reservoir. However, because of the different flow regimes that exist in the pressure transient test of a naturally fractured reservoir, it is necessary to understand the implication of each flow regime on the estimation of average reservoir pressure. This work presents solution methodology for pseudo-steady state behavior of a naturally fractured reservoir under commonly identified flow regimes coupled with matrix flow behavior.

The matrix flow behaviors investigated are pseudo-steady state and transient flow in the matrix blocks. Different matrix block flow models are used to analyze the reservoir pseudo-steady state behavior. A new approach to pseudo-steady state sugar cube model is also presented and the result obtained using the new approach is compared with the Warren and Root model. Finally, Tiab's Direct Synthesis (TDS) technique is applied in the computation of the average reservoir pressure.

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