Changes

file:BasinCenteredGasFig12.jpg|{{figure number|10}}Composite pressure gradient showing pressure end members (normal, underpressuring, and overpressuring relationships) within the Clinton-Medina-Tuscarora interval (modified from Law et al.<ref name=Lawetal_1998a />).

file:BasinCenteredGasFig12.jpg|{{figure number|10}}Composite pressure gradient showing pressure end members (normal, underpressuring, and overpressuring relationships) within the Clinton-Medina-Tuscarora interval (modified from Law et al.<ref name=Lawetal_1998a />).

The underpressured reservoirs in the Clinton-Medina are interpreted to have undergone an earlier overpressured phase caused by the thermal transformation of oil to gas.<ref name=Lawanddickinson_1985 /><ref name=Lawandspencer_1993 /><ref name=Lawetal_1998a /><ref name=Ryderandzagorski_2003 /> Later, during a period of regional uplift accompanied by loss of gas and reservoir cooling, the overpressured, gas-bearing Clinton-Medina underwent a transition to an underpressuring phase. The overpressured, gas-bearing Tuscarora Sandstone reservoirs in central Pennsylvania are interpreted to be pressure remnants of the earlier overpressured phase in the Clinton-Medina.<ref name=Lawetal_1998a /><ref name=Ryderandzagorski_2003 />.

The underpressured reservoirs in the Clinton-Medina are interpreted to have undergone an earlier overpressured phase caused by the thermal transformation of oil to gas.<ref name=Lawanddickinson_1985 /><ref name=Lawandspencer_1993 /><ref name=Lawetal_1998a /><ref name=Ryderandzagorski_2003 /> Later, during a period of regional uplift accompanied by loss of gas and reservoir cooling, the overpressured, gas-bearing Clinton-Medina underwent a transition to an underpressuring phase. The overpressured, gas-bearing Tuscarora Sandstone reservoirs in central Pennsylvania are interpreted to be pressure remnants of the earlier overpressured phase in the Clinton-Medina.<ref name=Lawetal_1998a /><ref name=Ryderandzagorski_2003 />

==References==

==References==

* [[Basin-centered gas systems]]

* [[Basin-centered gas systems]]

* [[Basin-centered gas systems: development]]

* [[Basin-centered gas systems: development]]

* [[Basin-centered gas systems: elements and processes]]

* [[Basin-centered gas systems: examples]]

* [[Basin-centered gas systems: gas resources]]

* [[Basin-centered gas systems: gas resources]]

* [[Basin-centered gas systems: global distribution]]

* [[Basin-centered gas systems: global distribution]]