Patent ID: 9274242
Filing Date: 2016-03-01
CPC Classification: G01V

Claim Text:
1. A method for determining effective fracture aperture from multi-axial electromagnetic induction measurements made by a multi-axial electromagnetic induction tool in a wellbore traversing subsurface formations, comprising using a computer for: determining a vertical fracture indicator from components of the multi-axial electromagnetic induction measurements made transverse to a tool axis, wherein the tool axis is substantially transverse to a bedding plane of the subsurface formations; determining a vertical fracture indicator to fracture aperture transform for the subsurface formations as a function of the vertical fracture indicator, a horizontal resistivity, a vertical resistivity, and a resistivity of drilling fluid; and determining the effective fracture aperture corresponding to the vertical fracture indicator by interpolating the vertical fracture indicator to fracture aperture transform.