Concurrent oil saturation and porosity imaging using completion-based on-demand electrodes

A method for determining electrical characteristics of a subsurface formation, the method comprising:

• during completion of a first hydrocarbon well, installing at least one first electrically insulating spacer between a plurality of well liners in the well to form at least one on-demand electromagnetic source electrode;
• during completion of a second hydrocarbon well, installing at least one second electrically insulating spacer between the plurality of well liners in the well to form at least one on-demand electromagnetic receiver electrode;
• performing an electrical survey using the least one on-demand electromagnetic source electrode and the least one on-demand electromagnetic receiver electrode;
• determining, using a computer processor, a map of the at least one electrical characteristic in a subsurface region surrounding the least one on-demand electromagnetic source electrode and the least one on-demand electromagnetic receiver electrode based, at least in part, on the electrical survey;
• determining, using a computer processor, a map of at least one formation property based, at least on part, on the map of the at least one electrical characteristic in a subsurface region;
• and
• updating, using a computer processor, a hydrocarbon reservoir production plan based, at least in part, on the map of at least one formation property.