公开(公告)号：US20170363531A1

公开(公告)日：2017-12-21

申请号：US15186694

申请日：2016-06-20

Applicant: CHEVRON U.S.A. INC.

Inventor： Marina Hruska ,  Mark Tadeusz Skalinski

IPC: G01N15/08 ,  G01V3/38

CPC classification number: G01N15/088 ,  G01V3/20 ,  G01V3/38

Abstract: 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.