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吐哈盆地台北凹陷油气封盖的主控因素，在微观封闭性能已满足现今油气藏封盖的油气柱高度时，已转变为盖层厚度变化、平面展布的稳定性和断裂的发育与活动。在两套区域盖层中，七克台组泥质超压层构成的第二套区域性盖层，超压值大于２０ ＭＰａ 和厚度大于２００ ｍ 的范围几乎覆盖了全凹陷，且厚度稳定连续，对其下的两期油气进行了有效的封盖，９５ 以上的储量位于其下地层，控制了油气的空间展布和富集程度，为最重要的区域性盖层。喜山期断裂活动产生的断裂，在各地的影响不同，鄯善油田以东地区，对油气破坏和调整较弱，两套区域性盖层相对保存完好，油气基本保持原始的展布风貌；以西地区断裂活动较强，两套盖层受到不同程度的切割，打乱了油气的原始展布状态，甚至伴有较大程度的散失，利于喜山期油气藏的形成
The main controlling factor of oil and gas cap in the Taibei Sag in Turpan-Hami basin has been changed to the change of cap thickness, the stability of plane distribution and the development and activity of faults when the microscopic sealing performance has satisfied the height of oil and gas capped by the present reservoir . In the two sets of regional caprocks, the second set of regional caprocks formed by the karst overpressures in the Qike Tai Formation almost cover the whole depression with the overpressure value greater than 20 MPa and the thickness greater than 200 m, and the thickness is stable and continuous , Effectively covered the two oil and gas fields under it. Reserves above 95 位 in the lower strata controlled the spatial distribution and enrichment of oil and gas, making it the most important regional caprock. The breakage caused by the Himalayan fault activity has different impacts in various places. The destruction and adjustment of oil and gas to the east of Shanshan Oilfield is relatively weak. The two sets of regional cap rocks are relatively well preserved and the oil and gas basically maintain the original distribution style. The faults in the area are relatively strong, and the two cap rocks are cut to different extents, disrupting the original oil and gas distribution status, even with a large degree of dissipation, which is favorable to the formation of the Himalayan oil and gas reservoir