莱州湾凹陷东部走滑带盐相关构造特征

通过对盐相关构造变形样式的探讨,证明莱州湾凹陷东部走滑带盐相关构造的形成受到走滑作用和重力流动作用控制,以盐层沿层流动为主要特征,由南至北,盐层逐渐由过成熟底辟向盐枕过渡。莱州湾凹陷东部走滑带盐上构造有盐上断裂背斜、盐撤凹陷、龟背构造、翼部地层超覆和盐体遮挡构造;盐层构造有枕状底辟、盐株和外来盐席;推测盐下构造有早期古隆起。盐相关构造经历了发育—调整—成熟—再活动4个主要阶段。盐上构造圈闭控制了莱州湾凹陷东部走滑带的油气聚集。

Characteristics of Salt-related Structures in the Eastern Strike-Slip Zone of Laizhou Bay Sag

It has been proved that the formation of salt-related structure in the eastern Laizhou bay sag wascontrolled by strike-slipping and gravitational gliding, according to the drilling data and seismic profiles. Theover-mature diapirs gradually transited to salt pillow from south to north in the strike-slip zone. The suprasaltstructures include: salt anticlines, salt-collapse basin, turtleback structures, stratigraphic overlaps and screenedstructures. The main salt bed structures are pillow-like salt diapirs, salt plugs and allochthonous salt sheets. Thesubsalt structures may be related to basement uplift. The salt-related structures experienced four stages which aregeneration, adjustment, maturation and reactivation. It has been found that the petroleum accumulation of strike-slip zone was controlled by salt-related traps in the eastern Laizhou bay sag.