** S&P 500 energy index .SPNY gains 1.3% as oil prices edge higher

** Brent crude LCOc1 futures up 0.7% at $66.75/barrel; U.S. West Texas Intermediate $(WTI)$ crude futures CLc1 rise 0.9% to $62.70/barrel

** Prices rise as market participants considered the global supply outlook and the possibility of a de-escalation in U.S.-Iran tensions O/R

** Oil majors Exxon Mobil XOM.N and Chevron CVX.N gain 2.4% and 1.1%, respectively

** ONEOK OKE.N, Williams Companies WMB.N, ConocoPhillips COP.N and Kinder Morgan KMI.N among biggest percentage gainers on the energy index, up between 1.7% and 2.6%

** Meanwhile, refiners Phillips 66 PSX.N gains marginally and Valero Energy VLO.N rises 2.4%

** Oilfield services companies SLB SLB.N rises ~2% and Baker Hughes BKR.O up marginally

(Reporting by Dharna Bafna in Bengaluru)

((Dharna.bafna@thomsonreuters.com))