Patent ID: 8756016

Claim:
A method for estimating a cumulative fracture aperture in a microscopically anisotropic formation penetrated by a well, comprising: measuring a vertical resistivity (Rv) of the microscopically anisotropic formation using a TMD (transverse magnetic dipole) logging tool and a horizontal resistivity (Rh) of the microscopically anisotropic formation using a LMD (longitudinal magnetic dipole) logging tool; measuring with one of the logging tools at least one of a mud resistivity (R mud ) or a matrix resistivity (R matrix ); and estimating the cumulative fracture aperture using the resistivity measurements, wherein the estimating comprises simultaneously solving the following two equations: R v =V hf ·R mud +(1 −V hf )· R matrix and 1 /R h =V hf ·1 /R mud +(1 −V hf )·1 /R matrix wherein V hf is the cumulative fracture aperture.