高邮凹陷南部断阶带构造沉降史与构造演化特征  

Tectonic subsidence history and evolution of southern fault terrace in Gaoyou Sag

作　　者：王力[1] 华伟[1] 夏连军[1] 范立新[1] 杨小军[1] 董文艺[1] 

机构地区：[1]中国石化江苏油田分公司物探技术研究院,江苏南京210046

出　　处：《西安石油大学学报（自然科学版）》2014年第6期29-34,7-8,共6页Journal of Xi’an Shiyou University（Natural Science Edition）

基　　金：中石化博士后项目(编号:JD11001);江苏油田科技重大专项(编号:JS10046)

摘　　要：通过去压实校正、剥蚀量恢复和去负荷校正等,计算了高邮凹陷南部断阶带构造不同时期的沉降量与沉降速率,并与深凹带进行对比,系统分析了沉降特征。结果表明,研究区构造沉降史总体上可划分为晚白垩世—古新世快速均匀沉降、始新世快速差异沉降和新近纪—第四纪缓慢沉降3个阶段。不同区段不同时期的沉降特征不尽相同,吴堡事件之前沉降量相近,始新世以来差异沉降特征明显,沉降中心由西往东逐渐迁移,反映了构造活动的阶段性和差异性。结合平衡剖面的分析,认为该区的构造演化可相应划分为3个阶段:晚白垩世—古新世断拗期、始新世断陷期和新近纪—第四纪拗陷期。The subsidence amount and the subsidence rate of southern fault terrace in Caoyou Sag in different periods are calculated by compaction correction,erosion thickness recovery and load correction,and the tectonic subsidence characteristics of the southern fault terrace are analyzed through comparing the southern fault terrace with deep sag zone.The results show that the tectonic subsidence history of the southern fault terrace can be generally divided into three stages:the rapid uniform subsidence stage from the Late Cretaceous to Paleocene,the rapid differential subsidence stage in Eocene and the slow thermal subsidence stage from Neogene to Quaternary.The subsidence characteristics of different zones in different stages are different.The subsidence amount of different zones is close before Wubu Event.But there is obvious difference in the subsidence characteristics of different zones since Eocene,the subsidence center migrated from west to east,which reflects the difference of tectonic activities in different stages.Combining the analysis results with balanced section,it is held that the tectonic evolution of the southern fault terrace is correspondingly divided into three stages:the faulting-downwarping stage from the Late Cretaceous to Paleocene,the rifting stage in Eocene and the downwarping stage from Neogene to Quaternary.

关 键 词：沉降史 构造演化 晚白垩世-新生代 南部断阶带 高邮凹陷 

分 类 号：TE121.2[石油与天然气工程—油气勘探]