柯克亚凝析油气田的成藏机理

塔里木盆地柯克亚凝析油气田的主要发育中新统上、下油组及始新统深部油组，由７个凝析油气藏组成。柯克亚背斜在安居安期即具雏形，主要形成于上新世末－更早新世。深部油组以侏罗系为油源，中新统上、下油组以石炭系－下二叠统和株罗系为混合油气源。柯克亚油气田具三阶段成藏模式，即“古油藏形成，背斜雏形期油气充注，晚期驱替成藏”。上、下油组为次生凝析气藏，深部油组为原生凝析气藏。根据对柯克亚周围地区钻探失利原因的分

POOL-FORMING MECHANISM OF KEKEYA CONDENSATE OIL, AND GAS FIELD

The Kekeya condensate oil and gas field in Tarim basin, where Upper and Lower Miocene oil formations, and the deeper Eocene oil formation developed, consists of seven condensate pools. The Kekeya anticline had rudimentary form in the Anjuan period, and formed during the period from the end of Pliocene to early Pleistocene. The deeper pool has been charged by the oil generated from Jurassic, and the upper and lower pools have been sourced by the Carboniferous and Lower Permian. This field has a three stage formation model, paleo-pool formation, hydrocarbon charging during the growing of anticline and recharging during the Iater period. As a result of that, the upper to lower formations became the secondary gas condensate pools and the deeper formation became the primary gas condensate pool. Based on the analyses of the reasons causing the failure of drilling in the adjacent anticlines to Kekeya area, this paper finally puts forward a strategy of hydrocarbon exploration in that region.