Passive Seismic Methods for Hydrocarbon Exploration

Passive seismic methods which use no active human-build source, but utilise the natural sounds of the earth, produce in most cases a low resolution of the subsurface compared to active seismic. Due to the usually low-frequency content of the earth’s seismic sources, they are often dismissed and not even considered as an add-on for an active-seismic campaign. And this, despite a similar resolution than gravimetric methods, minimal costs compared to an active survey, the same “domain” as active seismics, and their environmental friendliness.