METHOD OF ANALYZING A SUBTERRANEAN FORMATION USING TIME DEPENDENT TRANSIENT RESPONSE SIGNALS

摘要

Method of analyzing a subterranean formation traversed by a wellbore. The method uses a tool comprising a transmitter antenna (16) and a receiver antenna (18), the subterranean formation comprising one or more formation layers. The tool is suspended inside the wellbore (4), and one or more electromagnetic fields are induced in the formation (5). One or more time-dependent transient response signals are detected and analyzed. Electromagnetic anisotropy of at least one of the formation layers is detectable. Geosteering cues may be derived from the time-dependent transient response signals, for continued drilling of the well bore until a hydrocarbon reservoir is reached. The hydrocarbon may then be produced.