SYSTEM FOR MARINE SEISMIC EXPLORATION

摘要

PCT No. PCT/NO87/00004 Sec. 371 Date Oct. 2, 1987 Sec. 102(e) Date Oct. 2, 1987 PCT Filed Jan. 12, 1987 PCT Pub. No. WO87/04258 PCT Pub. Date Jul. 16, 1987.System for seismic profiling of structures (2) beneath the sea bottom, comprising an acoustic transducer array (12) which synchronously and coherently generates an acoustic wave adapted to be reflected from said structures (2). When the reflected acoustic waves propagate towards the water surface (1), there is caused a perturbation of the electromagnetic reflection coefficient thereof. Receiver means for detection and characterization of the received acoustic field at the surface (1), comprises a radar system (10) illuminating the region concerned of the surface (1) and imposes thereat a number of interferograms each corresponding to the acoustic field from a scattering point given by the position thereof and the frequency of the field. By recording the degree of coincidence between the interferograms and the acoustic perturbation pattern on the water surface (1), the seismic properties of said structures (2) are surveyed.