** India's upstream oil firms ONGC ONGC.NS and Oil India OILI.NS up 0.3% and 0.2% respectively
** Nifty oil and gas .NIFOILGAS up 1.1%, set for third weekly gain
** Ambit Capital cites government decision to hold off on windfall taxes a key positive for sector
** Revises crude oil realisation ceiling assumption to $80/barrel from $70, upgrades earnings per share by 13%-17% for both cos
** Adds, sustained policy push to increase acreage and accelerate deepwater, offshore exploration signals support
** Says, should expedite project timelines, reduce infrastructure bottlenecks, and enable upstream players to drive stronger production growth with better capital efficiency
** Indian exploration and production companies trade at a discount to global peers due to volatility in windfall taxes, historical production disappointments and capped gas realisations
** YTD, ONGC up 18%, while OILI up ~9%; Nifty Oil & Gas down 7%
(Reporting by Pranav Kashyap in Bengaluru)
((pranav.kashyap@tr.com; +919886482111;))