【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.更多还原

【Abstract】 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.更多还原