** S&P 500 Energy index .SPNY rises 0.2% as oil prices extend gains O/R

** Brent crude futures LCOc1 up 1.2% at $76.75/barrel and U.S. West Texas Intermediate crude futures CLc1 up 1.1% at $73.16/barrel

** Both contracts registered gains of close to 2% in the previous session after three consecutive weekly losses

** Oil prices rose amid concerns over Russian and Iranian oil supplies and sanctions threats, despite worries that escalating trade restrictions could dampen global economic growth

** Shipping of Russian oil to leading importers China and India has been disrupted by U.S. sanctions targeting tankers, producers and insurers

** Adding to supply concerns are U.S. sanctions on Iranian oil shipping networks to China after President Donald Trump restored his "maximum pressure" on Iranian oil exports last week

** Shares of oil and gas major rise; Exxon Mobil XOM.N up marginally and Chevron CVX.N gains 1%

** Devon Energy DVN.N, Diamondback Energy FANG.O, APA Corp APA.O and Phillips 66 PSX.N rise between 1.1% and 3.7%; among top percentage gainers on the energy index

** Oilfield services firms Halliburton HAL.N and Patterson-UTI Energy PTEN.O up 1.1% and 1.7%, respectively

(Reporting by Pooja Menon in Bengaluru)

((Pooja.Menon@thomsonreuters.com;))