A 10% increase in proved reserves seems high given the low price of gas, but it is likely a nod to technological advances and improved understanding of how to tap gas from existing fields. This has become evident in the Haynesville as companies have fine tuned their production approach to greatly increase expected ultimate recoveries. The official definition of proved reserves:
"Proved reserves are estimated volumes of hydrocarbon resources that analysis of geologic and engineering data demonstrates with reasonable certainty are recoverable under existing economic and operating conditions. Reserves estimates change from year to year as new discoveries are made, as existing fields are more thoroughly appraised, as existing reserves are produced, and as prices and technologies change."