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 was controlled by strike-slipping and gravitational gliding, according to the drilling data and seismic profiles. The over-mature diapirs gradually transited to salt pillow from south to north in the strike-slip zone. The suprasalt structures include: salt anticlines, salt-collapse basin, turtleback structures, stratigraphic overlaps and screened structures. The main salt bed structures are pillow-like salt diapirs, salt plugs and allochthonous salt sheets. The subsalt structures may be related to basement uplift. The salt-related structures experienced four stages which are generation, 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.