Marine seismic data contains two unwanted sea-surface reflections, a receiver ghost, and a separate source ghost. PGS provides full ghost-free imaging for the widest possible signal bandwidth by applying technology that removes both these unwanted reflections. PGS GeoSource® is a time and depth distributed source that uses sub-sources at varied depths and fired with specific time delays. The ghost functions of the sub-sources are complementary and when combined restore the full signal bandwidth.
The ability to re-occupy a predefined source location is particularly relevant for 4D surveys, where repeatability is crucial to detect and measure small changes in the seismic response as a result of oil and gas extraction from the reservoir. It also has benefits for standard 2D and 3D acquisition.