** Shares of Karoon Energy KAR.AX rise 3.9% to A$1.48, their highest level since Jan. 20
** The oil & gas explorer reports sales volumes of 3.14 MMboe in fourth quarter, 53% higher sequentially
** Co also announces additional $75 million buyback program
** Stock up over 6% this year, including the day's move
(Reporting by Rajasik Mukherjee in Bengaluru)
((Rajasik.Mukherjee@thomsonreuters.com))