Apparatus for obtaining nmr measurements of restricted diffusion in two orthogonal directions

An apparatus for obtaining respective 1H nuclear magnetic resonance (NMR) measurements of restricted diffusion in a geological formation in two orthogonal directions, the apparatus comprising:

• a. a magnet assembly configured to produce a magnetic field in an x-y-z space in a subterranean region of the geological formation;
• and
• b. an antenna assembly to produce an excitation in the x-y-z space perpendicular to the magnetic field and to acquire a response from the x-y-z space based on the excitation,
• wherein the apparatus is configured, when present in a horizonal subterranean borehole, to apply, at a first time, a magnetic field gradient Gz along a z-axis to obtain measurements of restricted diffusion in a direction perpendicular to a bedding plane, and to apply, at a second time, a magnetic field gradient Gx along an x-axis to obtain measurements of restricted diffusion in a direction parallel to the bedding plane.