Optimization of the “Fractured Triangle” to Determine Matrix/Fracture Permeability Ratio, Partitioning Coefficient and Intensity Index in Terms of Storativity Ratio from Pressure Transient Analysis

The graphical technique along with newly derived formulas yield the most important petrophysical and engineering parameters about the heterogeneous naturally fractured reservoir including effective fractures, matrix and skin systems volumes, partitioning coefficient, fracture intensity index, formation resistivity factor, formation tortuosity, effective drainage radius, damage radius, effective cementation exponent, fracture porosity, matrix porosity, storativity ratio, in addition to fracture permeability, matrix permeability, damaged permeability, average permeability, pressure drop across the damage area, skin factor, damage permeability, average/dimensionless diffusivity factor, flow efficiency, damage ratio/factor, economic implication of formation damage, average hydraulic “flow” unit quality index. The technique is extended to derive the fracture partitioning coefficient and intensity index in terms of storativity ratio all derived from the fractured triangle of pressure transient analyses along with the matrix/fracture permeability ratio. Again the graphical technique of the fractured triangle has proven to be successful for all kinds of fractured reservoirs including clastics, carbonates and basement rocks. This paper will present the theory along with successful field applications with the results.