Fracture characterization while drilling

A system comprising:

• a processor;
• memory accessible to the processor;
• and
• processor-executable instructions stored in the memory to instruct the system to:
• acquire data from a borehole imaging tool disposed in a borehole in a formation wherein the borehole includes electrically insulating oil-based fluid introduced into the borehole as a drilling lubricant;
• determine, based on the data, electrically insulating oil-based fluid impedivity and a reference formation impedivity via a circuit model that includes series and parallel terms;
• and
• detect a location of a fracture in the formation based on a change in current flow from the tool through the electrically insulating oil-based fluid and into the formation by determination of an effective formation impedivity based on at least a portion of the data for the location and by comparison of the effective formation impedivity to the reference formation impedivity.

One or more non-transitory computer-readable storage media comprising processor-executable instructions to instruct a computing system to:

• acquire data from a borehole imaging tool disposed in a borehole in a formation wherein the borehole includes electrically insulating oil-based fluid introduced into the borehole as a drilling lubricant;
• determine, based on the data, electrically insulating oil-based fluid impedivity and a reference formation impedivity via a circuit model that includes series and parallel terms;
• and
• detect a location of a fracture in the formation based on a change in current flow from the tool through the electrically insulating oil-based fluid and into the formation by determination of an effective formation impedivity based on at least a portion of the data for the location and by comparison of the effective formation impedivity to the reference formation impedivity.