Definition - What does Gas Zone mean?
A Gas Zone is a tight formation of porous rocks which contain natural gas. The zone may also contain small traces of crude oil and various other condensates. The natural gas is trapped in the tight rock formations at high pressure. The pressure is high enough that if a well is drilled, the natural gas will rise to the surface by itself.
Petropedia explains Gas Zone
Natural gas can be present in a gas reservoir in a conventional or non-conventional way. The zones that contain natural gas are shale gas formations, tight sands or tight gas reservoirs and coal bed methane.Shale gas, tight sands and coal bed methane are part of non-conventional gas reservoirs or gas formation zones where the gas is trapped in rocks that have high porosity and low permeability. On the other hand, conventional gas zone or a gas reservoir is a porous, permeable and sedimentary rock in which instead of any water, crude oil, condensates, only natural gas is present at a predominant basis.