The all-rounder was found to have breached the section of the International Cricket Council's code of conduct relating to "showing dissent at an umpire's decision" when he bowled a wide in the 48th over of the UAE innings, the governing body announced after the match.
And, according to a statement from the ICC, he then "continued to question the umpire's decision until bowling the next ball".
O'Brien has admitted the offence and accepted the sanction proposed by match referee Ranjan Madugalle, meaning there was no need for a formal hearing.
Eventually, on-field umpires Michael Gough and Nigel Long intervened by speaking to both players, while the same over saw Anwar become the first UAE batsman to score a World Cup hundred with a three off O'Brien.
The UAE finished on 278 for nine, with O'Brien conceding an expensive 61 runs in his seven overs.
But he was almost 'in credit' by the end of the match after his 24-ball 50 helped revive Ireland's innings and added vital late impetus to a run-chase that saw them win by two wickets with four balls to spare.
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