UPDATE 1-Brazil oil regulator asks Petrobras to ramp up output

* New targets could be reflected in next business plan * Petrobras production has fallen for past six months SAO PAULO, Jan 18 (Reuters) - Brazil's ANP oil regulator asked state-led Petrobras to increase production at one of its largest fields, increasing costs for the firm that already has the world's largest corporate spending program, ANP board meeting minutes showed. Petrobras said in a statement published online on Friday that it has not been officially notified of the reques