胶莱盆地莱阳期原型盆地恢复

The Prototype Character of Jiaolai Basin in Cretaceous Laiyang Period

应用区域地质调查资料、地震剖面解释、钻孔测井资料解释和野外典型剖面的观察,并运用层序地层学原理和方法,对胶莱盆地和沂沭地堑系沉积充填序列进行了描述与对比分析,基本理清了胶莱盆地地层层序格架,并恢复莱阳期胶莱盆地原形。胶莱盆地莱阳期发育两个独立的槽状断陷带:一个沿牟即断裂构造带发育,呈NNE向展布,称之为朱吴—即墨断槽带,该断槽带完全受牟即断裂带的控制;另一个沿沭河裂谷带和诸城凹陷发育,总体也呈NNE向展布,称为苴县—诸城断槽带。两个断陷槽控制了该期的沉积相及分布。另外,位于胶莱盆地东北角的郭城凹陷可能是一个独立的断陷盆地,其发育受东西两侧断裂控制。平度地区是否存在独立的断陷湖盆,目前尚难确定。苏鲁造山带北部边界断裂(百尺河断裂)的伸展复活主导了胶莱原形盆地的发育。

Laiyang Formation of Jiaolai Basin is the target stratum for oil and gas exploration. By measuring several field sections, log datum, seismic datum paleo-current direction,the paper indicated that different structural locations have different sedimentary facies. The Authors constructed sedimentary framework of Laiyang formation. Further more found two subside and deposition center, one is called Zhuwu-Jimo sag, along NNE direction, controlled by MupingJimo fault belt, another is called Juxian-Zhucheng sag, also NNE direction, along Shu-river rift and Zhucbeng depression. Two sags is a relatively independent sedimentary unit in Laiyang period. The two sags dominated sedimentary formwork in Laiyang Formation period, Shuinan member was apex of lake development, mainly was lacustrine facieses. While Qugezhuang member, mainly was alluvial deposition. North border fault activity of Sulu Oregon belt controlled the Laiyang Formation deposition.