摘要
利用稀土元素配分模式和重矿物组合特征,结合构造背景、沉积物源分析以及测井、井壁取心等资料,对珠江口盆地番禹低隆起的前古近系基底、珠海组、珠江组下段提出了新的分层方案,这一分层与已有的其他资料符合性更好。分析了研究区内铕、铈异常的特征与原因,认为除了不同物源的影响以外,较强的化学分化作用和沉积时的氧化环境也是造成本区铕、铈异常的直接原因。
According to the features of rare-earth-element（REE） pattern and heavy mineral assemblage chareacteristics with integration of GR and AC logging data and sidewall coring data,a new method of strata division from the pre-Paleogene to Neogene（the basement,Zhuhai Fm.and Lower Zhujiang Fm.） is proposed for Fanyu Lower Uplift in Pearl River Mouth Basin.By this method,the boundary between the basement and Zhuhai Fm.is shifted upward from 2,779m to 2,715.7m and the top of Zhuhai Fm.is shifted downward from 2,528.96m to 2,620m.This division is accord better with other available data.It is deemed that the reason why the Eu and Ce elements behave negative anomaly in this area is the influence of chemical differentiation and the oxidation environment during deposition beside the different sediment sources.
出处
《海相油气地质》
北大核心
2012年第3期47-54,共8页
Marine Origin Petroleum Geology
关键词
古近系
新近系
稀土元素异常
重矿物
地层划分
沉积环境
珠江口盆地
Paleogene
Neogene
REE anomaly
Heavy minerals
Stratum division
Sedimentary environment
Pearl River Mouth Basin
