METHOD AND APPARATUS FOR OFFSHORE HYDROCARBON ELECTROMAGNETIC PROSPECTING BASED ON CIRCULATION OF MAGNETIC FIELD DERIVATIVE MEASUREMENTS.

摘要

A system for offshore hydrocarbon electromagnetic prospecting is described. The system includes a transmitter generating electromagnetic energy and injecting an electrical current into a flooded vertical cable. The circulated induced vertical current time derivative's response generated by this current in the medium is measured by a circular chain of magnetometers. The measured response which is sensitive to the resistivity of targets is proposed to be used to search for and identify hydrocarbon reservoirs.