▁subs idi aries ▁of ▁foreign ▁companies <0x0A> </s> ▁The ▁Tw en eb oa ▁En yen ra ▁N tom me ▁ ▁O il ▁Field ▁is ▁an ▁oil ▁field ▁within ▁Gh ana ' s ▁territorial ▁waters ▁and ▁the ▁country ' s ▁second ▁major ▁oil ▁field ▁after ▁the ▁J ub ile e ▁O il ▁Field . ▁It ▁is ▁popular ly ▁known ▁as ▁the ▁T EN ▁oil ▁field , ▁an ▁ac ron ym ▁formed ▁from ▁the ▁three ▁dr illing ▁fields ▁that ▁it ▁compr ises . ▁Co inc ident ally , ▁the ▁expl oration ▁for ▁oil ▁in ▁the ▁bas in ▁also ▁started ▁with ▁ten ▁pre - first ▁oil ▁well s . ▁ ▁History ▁The ▁Tw en eb oa ▁En yen ra ▁N tom me ▁O il ▁Field ▁was ▁discovered ▁in ▁ 2 0 0 9 ▁by ▁Tul low ▁O il . ▁It ▁is ▁in ▁the ▁Deep water ▁T ano ▁license , ▁which ▁covers ▁an ▁area ▁of ▁more ▁than ▁ ▁and ▁lies ▁around ▁ ▁west ▁of ▁Tul low ' s ▁J ub ile e ▁O il ▁Field . ▁Equ ity ▁partners ▁of ▁the ▁Deep water ▁T ano ▁block ▁are ▁Tul low ▁( 4 9 . 9 5 % ), ▁Kos mos ▁Energy ▁( 1 8 % ), ▁Occ ident al ▁Pet role um ▁( 1 8 % ), ▁Pet ro ▁SA ▁( 4 . 0 5 % ), ▁and ▁the ▁Gh ana ▁National ▁Pet role um ▁Corporation ▁( GN PC ) ▁with ▁ 1 5 %. ▁Development ▁and ▁app rais al ▁of ▁the ▁three ▁deep ▁well s ▁started ▁in