Patent ID: 8390294
Filing Date: 2013-03-05
Classification: G01V

Abstract:
1. An apparatus configured to obtain an electrical characteristic of a subsurface material, the apparatus comprising: a downhole assembly configured to be conveyed in a borehole; and a plurality of sensor electrodes on the downhole assembly, wherein each of the plurality of sensor electrodes has a different capacitance to a wall of the borehole, wherein a first one of the plurality of sensor electrodes has a different extent in at least one of (I) a first direction substantially parallel to a longitudinal axis of the downhole assembly, and (II) a second direction substantially orthogonal to the longitudinal axis of the downhole assembly than an extent of a second of the plurality of sensor electrodes in at least one of: (I) the first direction, and (II) the second direction; and at least one processor configured to: