** Hong Kong shares of PetroChina 0857.HK rise 3.4% to HK$6, their highest since April 3
** Stock set for the biggest one-day pct gain since April 14; second biggest pct gainer on index tracking energy stocks .HSCIE, which adds 0.3%
** Shanghai-listed stock 601857.SS climbs 1.1% to 8.03 yuan, set for the biggest one-day pct rise since April 16
** China's top energy producer posted a 2.3% rise in first-quarter profit, citing higher natural gas output, even as poor margins weighed on the refined product business
** Citi maintains "buy" on the stock saying the results are strong Q1 beat and lower oil prices inevitably drags Q2 but gas buffers; says PetroChina remains its top China O&G pick
** Hang Seng Mainland Oil & Gas Index .HSMOGI climbs 0.7%, Hang Seng Index .HSI adds 0.2%
** YTD, Hong Kong stock down 5.1%, Shanghai shares down 11.2%
(Reporting by Donny Kwok)
((donny.kwok@thomsonreuters.com))
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