摘要
黄骅坳陷北大港构造带古近系沙河街组可划分为2个长期基准面旋回、8个中期基准面旋回以及43个短期基准面旋回.以中期基准面旋回为单元对沙河街组岩相古地理进行了系统研究.研究结果表明,各个时期形成的古地理格架既有继承性,又具有差异性:中期基准面A—D旋回沉积时期发育扇三角洲、滑塌浊积扇、近岸水下扇;中期基准面E旋回内发育近岸水下扇和滩坝;中期基准面F旋回内继承了E旋回的沉积特征,也发育了近岸水下扇和滩坝;中期基准面G旋回内主要发育重力流水道和近岸水下扇;中期基准面H旋回内主要发育重力流水道.
The formation is divided into 2 long-term cycles,8 middle-term cycles(named A,B,C,D,E,F,G and H middle-term cycles from bottom to top) and 43 short-term cycles.The sedimentary facies of the Shahejie Formation is studied taking the middle-term cycles as mapping units.The study results show that,fan-delta,slump turbidite fan and near-shore subaqeous fan develop very well during the middle-term A-D base-level cycles; near-shore subaqeous fan and beach-bars develop during E and F middle-term base-level cycles; gravity flow channel and near-shore subaqeous fan develop well during the middle-term G base-level cycle; gravity flow channel develops during the middle-term H base-level cycle.
出处
《西安石油大学学报（自然科学版）》
CAS
2006年第5期24-28,33,共6页
Journal of Xi’an Shiyou University（Natural Science Edition）
关键词
黄骅坳陷
古近系
沙河街组
层序地层格架
基准面旋回
沉积相
Huanghua Depression
Paleogene
Shahejie Formation
sequential stratigraphic framework
base-level cycle,sedimentary facies.
