中国石油大学学报（自然科学版）2025，Vol.49Issue(4)：11-25,15.DOI:10.3969/j.issn.1673-5005.2025.04.002
济阳坳陷古近纪孔店组—沙四下亚段沉积期的原型盆地格局
Prototype basin of sedimentary period of Ek Formation and the lower member of Es4 during Paleogene in Jiyang Depression
摘要
Abstract
Based on the latest 3D seismic and drilling data,this study reconstructs the syndepositional tectonic framework,strata erosion thickness,and original thickness,and combined with the regional tectonic background,clarifies the prototype basin during the depositional period from the Ek Formation to the lower member of the Es4 Formation.The results show that the remaining strata from the Ek Formation to the lower Es4 member can be subdivided into four tectonic sub-layers:the third,second,and first members of Kongdian Formation,and the lower member of the Es4 Formation.From bottom to top,the distribution range of residual strata increases,while their structural separation decreases,reflecting the combined effects of original deposition and subsequent erosion.During the deposition period of the third member of the Kongdian Formation,the Jiyang Depression exhibited two small,localized sub-sags,influenced by Late Mesozoic paleogeomorphology and an initial extensional tectonic setting.In the period of the second member,the Jiyang Depression evolved into an isolated,deeper fault basin under a gradually intensifying extensional regime,which can be divided into three major deposition areas:the north-eastern Zhanhua sag,the northeastern Dongying sag,and the southwestern Dongying-Huimin sag.With the deposition of the first member,the Jiyang Depression further deepened,the depositional area expanded,and structural segmentation weakened under stronger extensional forces.During the deposition of the lower member of the Es4 Formation,faulting continued and the lake basin further expanded.The tectonic characteristics and prototype basin configuration of the Jiyang Depression during the deposition of the Kongdian Formation and lower Es4 member were both inherited from pre-existing Late Mesozoic structures,while also exhibiting unique features.These strata experienced significant post-depositional denudation,mainly controlled by the fault block tilting and gentle slope uplift associated with later active faults trending near EW and NE direction.All tecton-ic sub-layer tops show evidence of substantial erosion,with the denudation of the lower Es4 member being particularly wide-spread.关键词
原型盆地/孔店组—沙四下亚段/地层沉积与剥蚀/断裂控盆/济阳坳陷Key words
prototype basin/sedimentary period of Ek Formation and the lower member of Es4/strata deposition and erosion/fault control basin/Jiyang Depression分类
天文与地球科学引用本文复制引用
李伟,秦瑞庆,贾海波,张鹏飞,邱贻博,李嘉,曹明月,贾丛硕,李兴安..济阳坳陷古近纪孔店组—沙四下亚段沉积期的原型盆地格局[J].中国石油大学学报（自然科学版）,2025,49(4):11-25,15.基金项目
国家自然科学基金项目(42072169) （42072169）
中国石化胜利油田分公司科研项目(2020370500200257) （2020370500200257）
