At the end of Ordovician Period, a differential elevation occurred in the central Shanganning Basin due to the Caledonian Movement.
陕甘宁盆地中部气田的主要储气层段为奥陶系马五段的古岩溶层。
The first was in the basin subsidence stage that was prior to the Caledonian movement. The second took place in the marginal sea deposition stage after the Caledonian movement.
区内下古生界烃源岩经历了两次成油过程，第一次发生在加里东运动前的盆地沉降阶段，第二次发生在加里东运动后晚古生代陆表海沉积阶段。
The area has undergone six stages of tectonic deformation with the second episode of Caledonian Movement (D_2) and the fifth episode of Himalayan Movement (D_5) as the most important ones.
该区经历了六个构造 形变期，以相当于 主加里东期的第二期（D_2）与喜马拉雅期的第五期（D_5） 形变期最为重要。
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