1 ▁m , ▁with ▁a ▁ 1 2 2 ▁m ▁vertical ▁closure . ▁Cru de ▁distribution ▁in ▁the ▁trap ▁is ▁affected ▁by ▁l ith ological ▁variation . ▁O il - water ▁levels ▁are ▁common ▁in ▁the ▁main ▁res er voir ▁members , ▁but ▁the ▁trans gress ive ▁series ▁is ▁ 4 3 ▁m ▁higher . ▁ ▁Sar ir ▁North ▁is ▁a ▁separate ▁trap ▁with ▁its ▁own ▁oil - water ▁contact , ▁ 3 0 ▁m ▁deeper ▁than ▁Sar ir ▁C . ▁L - 6 5 ▁also ▁has ▁an ▁independent ▁oil - water ▁contact . ▁The ▁field ▁has ▁no ▁gas ▁cap ; ▁pet role um ▁has ▁a ▁low ▁gas - o il ▁ratio ▁between ▁ 6 0 - 2 2 5 ▁standard ▁ft 3 / bb l . ▁Some ▁cru de ▁different iation ▁occurs , ▁probably ▁due ▁to ▁gravity ▁separation . ▁Over all , ▁it ▁consists ▁of ▁a ▁fairly ▁light , ▁w axy ▁cru de ▁having ▁a ▁mean ▁gravity ▁of ▁ 3 7 ° ▁API , ▁w ax ▁content ▁of ▁ 1 9 %, ▁and ▁a ▁sul fur ▁content ▁under ▁ 0 . 2 5 %. ▁The ▁pour ▁point ▁ranges ▁from ▁ 1 2 ° ▁to ▁ 2 4   ° C . ▁ ▁Gra vity ▁seg reg ation ▁of ▁cru de ▁in ▁the ▁trap ▁produced ▁a ▁peri pher al ▁tar ▁mat ▁in ▁per me able ▁intervals ▁of ▁the ▁res er voir ▁intersect ing ▁the ▁oil - water ▁level . ▁The ▁tar ▁mat ▁var ies ▁in ▁thick ness , ▁reaching ▁a ▁ 2 1