A system for monitoring a location of a borehole for production of petroleum from an earth formation is provided. The system includes: an assembly including at least one of an injection conduit for injecting a thermal source into the formation and a production conduit for recovering material including the petroleum from the formation; a guide conduit attached to at least a portion of the at least one of the injection conduit and the production conduit, the guide conduit extending in a direction at least substantially parallel to the at least one of the injection conduit and the production conduit; and a detection source conduit insertable through the guide conduit and configured to dispose therein a detection source for detecting a location of the assembly in the formation. A method of monitoring a location of a borehole for production of petroleum from an earth formation is also provided.