歧口凹陷埕北断阶带古近系层序地层学研究  

Study on the sequence stratigraphy of the paleogene in the northern Chengning fault-step belt of Qikou Sag

作　　者：杨革联[1] 刘震[1] 郭瑞[1] 刘俊榜[1] 常迈[1] 

机构地区：[1]中国石油大学(北京)资源与信息学院,北京102249

出　　处：《西安石油大学学报（自然科学版）》2007年第4期9-12,共4页Journal of Xi’an Shiyou University（Natural Science Edition）

摘　　要：利用20多口井的地质和测井资料以及三维地震资料,对歧口凹陷南部埕北断阶带的古近系沙河街组和东营组进行了层序地层学研究.在关键界面识别的基础上,将埕北断阶带的古近系划分为4个层序、11个体系域,建立起整个工区的时间框架.研究表明:①古近系该区沙三与沙一期相对湖平面上升幅度大,东营组次之而沙二期最小;②沙二段可以单独作为一个三级层序,但是其高位体系域不发育;③研究区靠近物源,砂体丰富,深湖相带分布范围局限.Sequence stratigraphy of Shahejie Formation and Dongying Formation of the paleogene of in the studied zone is studied based on well logging data,core data and three-dimensional seismic data.Based on the identification of key interfaces,the paleogene is divided into 4 sequences and 11 system tracts.The result indicates:(1) The relative lake levels of Sha-3 member and Sha-1 member rise more than Dongying Formation,and that of Sha-2 member rises the least.(2) Sha-2 member may be a single third-order sequence,but its high-stand system is not developed.(3) The studied zone is close to provenance,so sandy deposits are abundant,but the distribution of lake facies deposits o is limited.

关 键 词：岐口凹陷 埕北断阶带 古近系 层序地层学 

分 类 号：P539.2[天文地球—古生物学与地层学]