Patent ID: 7812611
Filing Date: 2010-10-12
Classification: G01V,Y02A

Abstract:
1. A method for determining electrical properties of a submarine petroleum fluid-bearing formation under overburden geological layers of thickness s under a seafloor of a sea, said method comprising: arranging one or more transmitter antennas in said sea, and arranging one or more electromagnetic receivers in said sea, said sea having a shallow sea depth of about 50 meters to about 350 meters; using said transmitter antenna transmitting electromagnetic signals of one or more pulses having frequency of very low frequency between about 0.01 Hz and about 0.10 Hz; using said receiver antennas, having an offset from said transmitter, for receiving propagated electromagnetic signals due to said emitted electromagnetic signals; and analyzing one or more components of said received signals from receivers having offsets between about 1 km and about 12 km, whether said signals differ significantly from a corresponding signal that would occur from a water-bearing formation, indicating a petroleum fluid-bearing formation.