Patent ID: 8805661

Claim:
A method for quantitatively calculating the oil and/or gas saturation of a fractured reservoir, comprising the steps of: a) taking full diameter core samples of a fractured reservoir of oil and/or gas and using those core samples to determine the relationship between the resistivity index (I) and the water saturation (Sw) of a matrix; b) performing sealed coring analysis of the fractured reservoir and obtaining data for the real water (oil (gas)) saturation of an undisturbed formation of the fractured reservoir from the sealed coring analysis data; c) obtaining fracture porosities at different depths in the fractured reservoir from known imaging logging data; d) calculating resistivity indexes at different depths using dual laterolog data combined with the core analysis data; e) establishing a percolation network model including matrix and fracture according to known regional pore structural features, and analyzed porosity and permeability data of a studied region, and determining the relationship between the resistivity index (I) and water saturation (Sw) in the fractured reservoir by drainage modeling; f) calibrating the numerical simulation results of the percolation network model using core experiment data and sealed coring analysis results; g) after calibration, determining the relationship between the resistivity index (I) and the water saturation (Sw) under different fracture porosities by numerical simulations; h) establishing an interpolation function between the resistivity index and the water saturation at different fracture porosities; and i) calculating the oil (gas) saturation of the fractured reservoir according to the fracture porosity obtained from step (c) by choosing an interpolation model from the resistivity index and the water saturation obtained in step (h).