吐哈盆地台北凹陷非构造圈闭的有利探区

吐哈盆地台北凹陷中浅层已经进入了以非构造油气藏为主的勘探阶段,及时开展非构造圈闭类型研究对于选择勘探目标、明确勘探主攻方向意义十分重大。应用层序地层学和坡折带理论,对台北凹陷中浅层层序地层格架进行了综合分析,指出三级层序是最基本的储盖单元,凹陷南部是非构造圈闭发育的最有利地区。以层序地层研究成果为依据,认为台北凹陷中浅层主要发育岩性和地层两类四种非构造圈闭,火焰山北坡的葡萄沟构造带，胜北洼陷南缘的苏巴什、连木沁鼻状隆起,丘东洼陷中央及南斜坡,小草湖洼陷南缘疙瘩台和红台鼻状隆起是最现实的勘探领域。

Non-Structural Traps and Favorable Prospecting Areas in Taibei Sag, Tuha Basin

The middle and shallow strata of Taibei sag in Tuha basin have entered into prospecting stage of non-structural reservoirs, so it is meaningful for in-time study of the non-structural traps to select targets and ascertain major directions for petroleum exploration. The comprehensive analysis of sequence stratigraphic framework in this sag by applying sequence stratigraphy and slope break theory suggests that the third class sequence is the most basic reservoir-cap unit, and the southern Taibei sag is the most favorable area with non-structural traps. The results show that there exist two types or four kinds of lithologic and stratigraphic traps in middle and shallow strata of Taibei sag, where Putaogou structural belt in north slope of Huoyanshan, Subashi and Lianmuqin nose-like uplifts in southern margin of Shengbei sub-sag, central part and south slope of Qiudong sub-sag, Gedatai and Hongtai nose-like uplifts in southern margin of Xiaocaohu sub-sag are the most promising domains for petroleum prospecting.