** Shares of Australia's Origin Energy ORG.AX down 4.7% so far in week, set for worst week since early February
** The country's top electricity and gas retailer by market value posted 17% drop in Q3 revenue from its stake in the Australia Pacific LNG project earlier this week
** Says lower revenue due to lower production at the flagship LNG project, reflecting two fewer days in the quarter and declining output from ageing gas fields
** Stock up 0.6% on day at A$12.175, with YTD gains of 6%
(Reporting by Sneha Kumar in Bengaluru)
((Sneha.kumar@thomsonreuters.com;))