论文部分内容阅读
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三个二级层序、十个三级层序,SQ9(J_2q)、SQ8(J_2s~2)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,岩性圈闭成生模式主要有四种: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。其中前三者为隐蔽圈闭的主要成生类型,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,并已取得勘探重要进展。
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, The exploration potential in the reservoir is larger; the middle and shallow layers in the western part of the Taipei sag can be identified as three second-level sequences and ten third-level sequences. The ascending cycles of SQ9 (J_2q) and SQ8 (J_2s_2) are subtle reservoirs Lithologic reservoirs), the development of the Qingsuhu braided river delta and the Subashi braided river delta sedimentary system, the sedimentary sand body controlled by the regional slope and slope break tectonic setting, lithology circle There are mainly four kinds of closed-generation modes: ① Superstructure on the delta front of the slope belt; ② Supra top of the delta front in the slope break zone; ③ Late tilting type of the front sand body; ④ Slope break- . Among them, the first three are the major perennial types of subtle traps, the Grape Valley in the northern part of Huanshan Sag of Shengbei Sag, the northern part of Pubei East slope, Is the main exploration zone for subtle reservoirs recently and has made important progress in exploration.