Table R5.1 Reserve and production changes in marketable conventional gas (109 m3)
  Gross heating value (MJ/m3)   Volumes
  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.