Eclipse Resources Corp. (NYSE: ECR) said Feb. 17 that its proved reserves on Dec. 31, 2014 were 355.8 billion cubic feet equivalent, a 353% increase compared with proved reserves at Dec. 31, 2013.

Year-end 2014 proved reserves were 72% operated by the company, 39% proved developed producing and 72% natural gas.

The Securities and Exchange Commission prices at year-end 2014 were $94.99 per barrel of oil and $4.35 per million British thermal units for natural gas.

Netherland, Sewell & Associates Inc. engineers prepared the year-end 2013 and year-end 2014 reserves.

State College, Pa.-based Eclipse Resources Corp. works in the Utica and Marcellus.