SYSTEM AND METHOD FOR ESTIMATING POROSITY DISTRIBUTION IN SUBTERRANEAN RESERVOIRS

摘要

A system and method for estimating porosity distribution in a region of interest of a geologic formation from a resistivity image log representative of the geologic formation is disclosed. A normalization factor representative of a rock matrix based on a first resistivity value and an image point factor based on a second resistivity value are calculated and compared to identify points in the resistivity image log that correspond to the secondary porosity. The normalization factor and image point factor are recalculated based on a different first resistivity value and a different second resistivity value as necessary to identify additional points in the resistivity image log that correspond to the secondary porosity until a termination criterion is met. The method may further include a porosity calibration operation and one or more artifact corrections.

主权项

1. A computer-implemented method for estimating porosity distribution in a region of interest of a geologic formation, from a resistivity image log representative of the geologic formation, the method comprising:
a. calculating a normalization factor representative of a rock matrix based on a first resistivity value; b. calculating an image point factor based on a second resistivity value; c. comparing the image point factor and the normalization factor to identify points in the resistivity image log that correspond to the secondary porosity; d. recalculating the normalization factor and the image point factor based on a different first resistivity value and a different second resistivity value; e. re-comparing the recalculated normalization factor and the recalculated image point factor to identify additional points in the resistivity image log that correspond to the secondary porosity; and f. repeating the recalculating and re-comparing steps until a termination criterion is met.