Abstract The development of tight gas reservoirs within the Ordos basin is closely related to the tectonic evolution. In this study, homogenization temperature of aqueous inclusions and the burial and thermal history of single well were combined to determine the tight gas charging time in the Permian Lower Shihezi sandstones in the Hangjinqi area, northern Ordos Basin. The paleo-structural characteristics and tectonic evolution, and their controls on source rock, gas migration and accumulation were discussed based on detailed 3D seismic interpretation. Results show that the natural gas was charged during the Middle Jurassic to the Early Cretaceous (170-140 Ma) in the southern part of the Porjianghaizi fault, while in the northern part, the gas charging time was the Early Oligocene to the Late Miocene (31-8 Ma). Paleo-topography in the Late Paleozoic controlled the coal beds thickness with generally decreasing trend to northward. Different burial depths led to the variation of thermal evolution, hydrocarbon generation time and intensity of source rocks between the northern and southern part. The results of this study indicate that the Hangjinqi area was evolved into a tectonic pattern with higher elevation in the south than the north in the Late Jurassic. The gas reservoirs in the southern part were mainly distributed in the paleo-slopes and paleo-highs, where were favorable areas for the gas accumulating in the Late Jurassic. Afterwards, the study area began to uplift since the late Early Cretaceous and made the Hangjinqi area a southwest inclined monocline. The rapid tectonic uplift event since the Early Oligocene in the northern Ordos Basin destroyed and reallocated the primary gas reservoirs in the southern part and prompted the gas migrating and accumulating into the structural traps in the northern part. The variation of natural gas compositions in both northern and southern parts verified the gas migration process.

中文翻译：

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二叠系致密气成藏的构造控制: 鄂尔多斯盆地北部杭锦旗地区流体包裹体与古构造重建的制约

摘要 鄂尔多斯盆地致密气藏的发育与构造演化密切相关。本研究结合含水包裹体均一温度和单井埋藏热史，确定鄂尔多斯盆地北部杭锦旗地区二叠系下石河子砂岩致密气充注时间。在详细的3D地震解释的基础上，讨论了古构造特征和构造演化及其对烃源岩、天然气运移和聚集的控制。结果表明，坡江海子断裂南段天然气充注时间为中侏罗世至早白垩世（170～140 Ma），而北部地区充注时间为早渐新世至晚中新世（ 31-8 毫安）。晚古生代古地貌控制煤层厚度，总体向北呈递减趋势。不同埋深导致南北两侧烃源岩热演化、生烃时间和强度不同。研究结果表明，杭锦旗地区在晚侏罗世演化为南高北高的构造格局。南部气藏主要分布在古斜坡和古高地，是晚侏罗世天然气成藏的有利区。此后，研究区从早白垩世晚期开始隆升，使杭锦旗地区成为西南倾斜的单斜。鄂尔多斯盆地北部早渐新世以来的快速构造抬升事件破坏并重新分配了南部的原生气藏，促使天然气运移并聚集到北部的构造圈闭中。北部和南部天然气成分的变化验证了天然气运移过程。