鄂尔多斯盆地延长探区上古生界剥蚀厚度恢复  

Thickness recovery of Upper Palaeozoic denudationin the Ordos Basin Extension Prospect

作　　者：赵子丹 谭云龙[2] 杨茜 郭雨嘉 沙洁 ZHAO Zi-dan;TAN Yun-long;YANG Qian;GUO Yu-jia;SHA Jie(Natural Gas Research Institute Branch,Shaanxi Yanchang Petroleum(Group)Company Limited,Xi'an 710075,Shaanxi;Gas Field Company of Shaanxi Yanchang Petroleum(Group)Co.Ltd,Shaanxi Yan'an 716000;Xingzichuan Oil Extraction Plant,Yan′an 717400,Shaanxi Province,P.R.China)

机构地区：[1]陕西延长石油(集团)有限责任公司天然气研究院分公司,陕西西安710075 [2]陕西延长石油(集团)有限责任公司气田公司,陕西延安716000 [3]延长油田股份有限公司杏子川采油厂,陕西延安717400

出　　处：《地下水》2024年第2期130-133,共4页Ground water

摘　　要：剥蚀厚度恢复是进行盆地地质建模、埋藏演化、油气成藏等定量分析的基础。本文在钻井、录井和测井资料基础上,优选地层趋势对比法为主、泥岩压实曲线外推法为辅的剥蚀量恢复方法,对剖面进行了剥蚀量恢复。研究表明,晚三叠纪和侏罗世,延长组顶部遭受剥蚀的强度较弱,整体上呈现出东厚西薄的特征,剥蚀厚度介于0~300 m。晚白垩世延长组在黄陵-富县-子长一线以东遭受剥蚀,厚度普遍在500 m以上,延安/富县组剥蚀范围向西扩大,剥蚀厚度介于0~400 m,直罗/安定组在延762-延1773-延268-延1092-延893-延908-延1410以东发生剥蚀,剥蚀厚度在0~300 m之间。下白垩系普遍遭受了剥蚀,剥蚀厚度在650~2000 m分布,在平面上具有西部厚度低和东部厚度高的特点,在靖边、子长、子洲等地区剥蚀厚度最大,可以达到1 500 m以上。Stripping thickness recovery is the basis for quantitative analyses such as basin geological modelling,burial evolution,and hydrocarbon formation.In this paper,on the basis of drilling,logging and logging data,the preferred method of stripping volume recovery is the stratigraphic trend comparison method,supplemented by the extrapolation method of mudstone compaction curve,and the stripping volume recovery is carried out on the profile.The study shows that in the Late Triassic and Jurassic,the top of the Prolongation Formation suffered from weak denudation,and on the whole showed the characteristics of thick in the east and thin in the west,with the thickness of denudation ranging between 0 m and 300 m.The Late Cretaceous Yanchang Formation suffered denudation east of the Huangling-Fuxian-Zichang line,with a thickness generally above 500 m.The denudation of the Yanan/Fuxian Formation expanded westward,with denudation thicknesses ranging from 0 m to 400 m,and the Zhiluo/Anding Formation was denuded east of the Yan762-Yan1773-Yan268-Yan1092-Yan893-Yan908-Yan1410 line,with thicknesses ranging from 0 m to 300 m.The Late Cretaceous Yanchang Formation was denuded east of the Huangling-Fuxian-Zichang line,with thicknesses ranging from 0 m to 300 m.The Lower Cretaceous generally suffered from denudation,the thickness of denudation is distributed in 650~2000 m,with the characteristics of low thickness in the west and high thickness in the east in the plane,and the thickness of denudation is the largest in the areas of Jingbian,Zicang,Zizhou,etc.,and it can reach more than 1500 m.

关 键 词：地层剥蚀厚度 地层对比 延长组 上古生界 鄂尔多斯盆地 

分 类 号：P534.5[天文地球—古生物学与地层学]