Table R5.1 Reserve and production changes in marketable conventional gas (10⁹ m³)
	Gross heating value (MJ/m³)		Volumes
	Gross heating value (MJ/m³)		2017	2016	Change
Initial established reserves			5 636.5	5 560.9	+75.6
Cumulative production			4 887.4	4 802.4	+85.0a
Remaining established reserves downstream of field plants
As is	39.3		749.0	758.4	-9.4
			(26.6 Tcf)^b	(26.9 Tcf)^b
Minus liquids removed at straddle plants			24.8	24.0	+0.8c
Remaining established reserves downstream of straddle plants
As is	37.4		724.2	734.5	-10.2c
			(25.7 Tcf)^b	(26.1 Tcf)^b
Annual production	37.4		100.8d	100.4d	+0.4d
^a Change in cumulative production is a combination of annual production and all adjustments to previous production records.
^b Tcf – trillion cubic feet.
^c Any discrepancies are due to rounding.
^d Does not include conventional gas from AER-defined CBM wells.