The use of fractal model in Pressure Transient Test Analysis was introduced by Chang and Yortsos in 1990. Their concept was derived from the assumption of Warren and Root model where their reservoir contains two systems with contrast in porosity and pemeability properties, which are well-known as matrices and fracture network.

The fracture network is assumed to be connected and distributed as fractal object in a homogeneous medium (matrix) of Euclidean Geometry. Fluid flow from reservoir to well occurs only through the perfectly connected fracture network. Based on these assumptions, Chang and Yortsos developed the unsteady-state flow of slightly compressible fluid and proposed an extension of the diffusivity equation to model transient flow in fractured reservoirs, especially in single well testing.

The physical and mathematical model descriptions are developed from Chang and Yortsos model. By Type Curve Matching technique, we can analyze the interference test in reservoir considered as a complex naturally fractured reservoir such as the one operated by Amoseas Indonesia Inc. Besides transmissibility and storativity we can also obtain the fractal dimension which can be used to predict the complexity of the reservoir.

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