沉积学报2011，Vol.29Issue(5)：906-916,11.
浅海陆棚环境下沉积坡折带及其对局部强制海退体系域的控制
Depositional Slope Break in Shallow Marine Shelf Setting and Its Control on Regional Forced Regressive Wedge Systems Tract
摘要
Abstract
During the deposition of the Miocene Zhujiang Formation,the HZ Sag in the Pearl River Mouth Basin,South China Sea,was a stably deposited shelf setting.A large-scale paleo-Pearl River water system was developed in the western part of the study area and provided abundant terrestrial clastic deposits for the large-scale Pearl River delta.A case study on sequence PSQ6 has been carried out in this paper.The depositional slope break of sequence PSQ6 is characterized by a certain developing scale of about 4 km slope width,20-60 m height difference and 80 km transverse distribution range.Depositional slope breaks were mainly developed during the ending time of the depositional period of highstand systems tract delta of underlying sequence.A regional ＂ditch-trough＂ system was formed along the area between depositional slope break and carbonate buildup in the east of prodeltaic subfacies,thus provided a favorable paleogeomorphic setting for the deposition and preservation of PSQ6 forced regressive wedge systems tract（FRWST） and furthermore controlled the development of regional forced regressive wedge in shelf environment.The forced regressive sandbodies are easily formed due to the ＂ditch-trough＂ paleogeomorphic setting in shelf environment.The prograded sandbodies directly cover the shallow marine mudstones of the underlying sequence highstand systems tract and are overlaid with the dark-color mudstones of transgressive and highstand systems tracts,thus a favorable source-reservoir-caprock assemblage is formed and stratigraphic-lithologic hydrocarbon accumulations usually occur in these areas.关键词
珠江口盆地/珠海组/沉积坡折带/强制海退体系域Key words
Pearl River Mouth Basin/Zhujiang Formation/depositional slope break/forced regressive wedge systems tract分类
天文与地球科学引用本文复制引用
刘豪,王英民,王媛..浅海陆棚环境下沉积坡折带及其对局部强制海退体系域的控制[J].沉积学报,2011,29(5):906-916,11.基金项目
国家重点基础研究发展计划（973计划）课题 （）
国家自然科学基金项目（批准号：40572067）资助 （）
