** Canadian oil producer's shares up 13 pct at C$4.88, top gainer on Toronto Stock Exchange
** U.S.-listed shares up 14 pct at $4.27, one of the top gainers on NYSE
** Talisman said late on Monday that it had been approached by a number of parties, including Spain's Repsol SA, for various transactions
** Said that "there is no assurance that any transaction will be agreed"
** Reuters had reported in August that the Spanish energy company's talks to buy Talisman were in difficulty, citing three sources familiar with the matter
** Up to monday's close, Toronto-listed stock has lost about 65 pct of its value this year