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吐哈盆地台北凹陷中浅层隐蔽油气藏勘探尚处于初期阶段,已发现地层型、岩性型和构造-岩性复合型3类隐蔽油气藏,但其数量和储量所占比重小,隐蔽油气藏勘探潜力较大。台北凹陷西部中浅层可识别划分为3个二级层序、10个三级层序,SQ9(J2q)、SQ8(J2S2)基准面上升旋回是隐蔽油气藏(岩性油气藏)勘探的主要目的层序,发育七泉湖辫状河三角洲和苏巴什辫状河三角洲沉积体系,其沉积砂体受区域斜坡和坡折带构造背景的控制。岩性圈闭生成模式主要有4种:①斜坡带三角洲前缘上超型,②坡折带三角洲前缘顶超型,③前缘砂体后期掀斜型,④坡折带湖底扇-斜坡扇型。其中,前3种为隐蔽圈闭的主要生成类型。胜北次凹周缘的火焰山北坡葡萄沟段、葡北东斜坡、火北鼻隆、苏巴什鼻隆和连木沁鼻隆区是近期勘探隐蔽油气藏的主攻区带。
The exploration of subtle middle and shallow subtle reservoirs in the Taibei Sag, Turpan-Hami Basin is still in its infancy. Three types of subtle reservoirs of stratiform, lithology and tectono-lithology have been discovered, but their proportions are small and subtle, Potential exploration potential. The middle and shallow strata of the western part of the Taipei depression can be divided into three second-level sequences and ten third-level sequences. The ascending cycle of the SQ9 (J2q) and SQ8 (J2S2) datum is the main exploration of subtle reservoirs (lithologic reservoirs) The purpose of the sequence, the development of Qixianhu braided river delta and Subashi braided river delta sedimentary system, the sedimentary sand body by the regional slope and slope belt structural background control. There are mainly four types of lithologic traps: ① supramatal delta front in slope belt, ② top delta front in subduction zone, ③ post-tilting type in front sand body, ④ slope subsidence sublacustrine fan-slope Fan type. Among them, the first three kinds are the main types of formation of hidden trap. The northern part of Huosheng Mountain on the northern margin of Shengbei Sag is the main zone for the exploration of subtle reservoirs in the future.