Quantitative calculation method for hydrocarbon saturation of fractured reservoir

摘要

A quantitative calculation method for hydrocarbon saturation of fractured reservoir during oil exploitation is provided. The method comprises: obtaining the fracture porosity and calculating resistivity index at different depth of fractured reservoir with known full diameter core and image logging data; establishing the percolation network model of matrix and fracture combination with known pore structural feature; calibrating the numerical simulation results obtained from percolation network model based on the data of core experiment and sealed coring, then obtaining the relationship between the resistivity index(I) and water saturation(Sw) at different fracture porosity; calculating the hydrocarbon saturation of fractured reservoir through selecting interpolation function. The hydrocarbon saturation calculated with said method is 0.67, however 0.49 with common method. The accuracy is obviously improved more than 0.18.