济阳坳陷桩海地区构造演化特征研究

目前济阳坳陷桩海地区已经发现桩西油田、五号桩油田和长堤油田,但是对该区的构造,尤其是对前第三系构造认识并不清晰.应用平衡剖面原理研究了该地区的构造特征和构造演化过程,并分析了该区构造与郯庐断裂带的关系.结果表明:①桩海地区构造演化可以大致划分为3个阶段,即前中生代整体升降阶段、中生代末期的挤压隆升阶段和新生代断陷—坳陷阶段;②郯庐断裂带的活动是桩海地区中生代以来构造运动的动力源,控制了本区构造特征和构造演化过程;③由郯庐断裂走滑所派生的旋转使桩海地区成为NW向构造带中挤压构造最发育的地区.

Study on the tectonic evolution of Zhuanghai area in Jiyang Depression

At present, Zhuangxi oilfield, Wuhaozhuang oilfield and Changdi oilfield are found in Zhuanghai area of Jiyang Depression. But the structure in this area, especially the structure in Pretertiary is not recognized clearly. The structure and the tectonic evolution of Zhuanghai area are studied by using balanced section theory. The relationship between the structure in this area and Tan - Lu faults is also analyzed. The following conclusions can be drawn: (1) The tectonic evolution in Zhuanghai area can be divided into 3 phases: the whole uplifting and settling phase in Premesozoic, the compressing and uplifting phase at the end of Mesozoic, the faulting-depressing phase in Cenozoic. (2) Tan- Lu faults control the structure and its evolution, and the activities of Tan - Lu fault is the dynamic force of the structural movement in Zhuanghai area since Mesozoic. (3) the rotation derived from the slip of Tan - Lu fault makes this area become the most developed zone of compressional structures among the structural zones of NW trend.