Energy stocks were mixed Tuesday afternoon, with the NYSE Energy Sector Index up 0.1% and the State Street Energy Select Sector SPDR ETF (XLE) fractionally lower.

The Philadelphia Oil Service Sector Index added 0.6%, and the Dow Jones US Utilities Index was slightly lower.

Front-month West Texas Intermediate crude oil declined 1.2% to $91.23 a barrel, and the global benchmark Brent crude contract shed 0.5% to $99.89 a barrel. Henry Hub natural gas futures gained 4.4% to $2.96 per 1 million BTU.

In corporate news, Abu Dhabi's XRG is considering taking a stake in the Shell-backed (SHEL) LNG Canada project, Bloomberg reported. Shell shares were up 0.9%.