They said that price of main crude Marban oil field has increased from $33.15 to $33.80 per barrel, while Lower Zakoum field crude went up $33.20 to $33.85 per barrel. While Um Al Shaif crude moved upwards to $33.60 from $32.95 per barrel, Upper Zakoum crude climbed to $32.10 from $31.45 per barrel. PIN//MENAFN