Patent ID: 8030934
Filing Date: 2011-10-04
Classification: G01V,Y02A

Abstract:
1. A method for an electromagnetic survey of electrically resistive target objects that potentially contain hydrocarbons, said method comprising: determining electrical characteristics of a stratum being surveyed by use of a transverse magnetic mode of at least one electromagnetic field source and registration of a transverse magnetic response; generating an intermittent source current pulses with a sharply defined termination in the at least one electromagnetic field source; transferring the intermittent source current pulses to a submerged, essentially vertical transmitter antenna and into the strata; intercepting a medium response with at least one receiver deployed in an induction zone and provided with at least one submerged, essentially vertical receiver antenna, in time between consecutive current pulses; and measuring strata response in the induction zone, wherein the horizontal distance between the at least one transmitter antenna and the at least one receiver is equal to R, and R≦(tρ