Patent ID: 9146200
Filing Date: 2015-09-29
Classification: E21B,G01N

Abstract:
1. A method for determining an orientation of a reservoir feature from an unoriented core from a subsurface, comprising: selecting an arbitrary inclined plane in a longitudinal or transverse cross sectional CT scan image of the unoriented core, the unoriented core being extracted from a borehole that is inclined relative to a vertical direction; flattening the inclined plane by realigning all voxels within a volume of the core so as to obtain a horizontal plane in a realigned core; selecting a transverse cross sectional CT scan image of the realigned core where a desired feature is present; determining a correcting angle to be added to an angle of a flat-bed contact plane of the realigned core relative to a reference mark in the realigned core to obtain a correct inclination angle relative to one or more compass map coordinates; determining a first angle between a direction perpendicular to the feature in the transverse cross sectional CT scan image relative to the reference mark; and determining a second angle of the direction perpendicular to the feature by adding the correcting angle to the first angle, the second angle corresponding to the angle of water flow or channel mapped to the compass coordinates.