METHOD AND APPARATUS FOR SEISMIC MONITORING OF AN UNDERGROUND ZONE BY SIMULTANEOUS USE OF SEVERAL VIBROSEISMIC SOURCES

摘要

The invention concerns a method and a system for monitoring an underground zone (1) comprising the simultaneous use of several seismic vibrators. The system comprises for example several local units (LU) each comprising a vibrator (5), an antenna (2) of seismic sensors, a local acquisition and processing unit (6), and a central control and synchronising unit (8) for simultaneously controlling the various vibrators with orthogonal signals, the local units (6) being adapted by specific processing operations, to isolate and reconstruct the seismograms corresponding to the inputs of the different vibrators. The invention is useful for monitoring a hydrocarbon deposit during production or a gas-storage tank for example.