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固安凹陷的重力滑动构造是在大兴缓倾角正断层上盘岩层的边沉积、边旋转、边滑移和边翘起过程中,因滑移较远、抬升较高、倾斜较大的岩层重力失稳而侧向滑脱造成的。在同一凹陷中,断层的旋转、滑移运动,生、储、盖层的沉积作用和重力侧向滑动作用同步发生。彼此既相互影响,又互相补偿,以其形成的重力滑动构造圈闭,有利于油气的富集,它应是石油勘探的主要对象之一,本文对这一构造的动力机制作了探讨。
The gravitational-sliding structure of Gu’an Sag is deposited on the edge of the plate-bearing rock in the Dachang syncline, and the gravitational forces of the rock strata, which are higher due to the slippage and higher lift during the rotation, edge-slip and edge-lift, Unstable and caused by lateral slippage. In the same depression, the fault rotation and slipping movement, the sedimentation of the raw, reservoir and cap rocks and the lateral sliding of gravity occur synchronously. They interact with each other and compensate each other. With the formation of gravity-slip structural traps, it is conducive to the enrichment of oil and gas. It should be one of the main targets of petroleum exploration. This paper discusses the dynamical mechanism of this structure.