爱尔兰克莱尔盆地Ross Sandstone组深水浊积岩露头高分辨率层序地层学

发布时间：2018-02-23 19:16

  本文关键词： 基准面旋回 向上变厚旋回 沉积模式 高分辨率层序地层学 深水浊积朵叶体 克莱尔盆地 爱尔兰　出处：《石油与天然气地质》2017年01期 　论文类型：期刊论文

【摘要】：应用高分辨率层序地层学原理和分析方法,通过对爱尔兰西海岸Ross Sandstone组深水浊积朵叶体露头的详细研究,基于侧向稳定展布的泥岩段、沉积构造与岩相组合、砂岩融合的程度以及沉积物的样式与厚度4个方面,建立了研究区高分辨率层序地层格架,探讨了深水浊积朵叶体的沉积模式及不同层次基准面旋回的控制因素。研究表明,富含有机质与棱菊石化石的远洋泥岩是长期基准面旋回的界面。在长期旋回内,侧向展布数千米至数万米的薄层泥岩夹粉砂岩是中期基准面旋回的界面。每一个中期旋回都由数个相互叠置的向上变厚旋回组成,单个向上变厚旋回通常由底部薄层泥岩夹粉砂岩开始,往上逐渐转变为厚层的无构造砂岩;其厚度通常为0.5~7 m,并可稳定延伸数百米至数千米,反映了朵叶体的持续前积作用。
[Abstract]:Based on the high resolution sequence stratigraphy principle and analysis method, a detailed study of the outcrop of the deep-water turbidite leaf bodies of the Ross Sandstone formation on the west coast of Ireland, the sedimentary structure and lithofacies combination of the laterally stable spreading mudstone segment are presented. In this paper, the high resolution sequence stratigraphic framework of the studied area is established, and the sedimentary model of the turbidite leaf body in deep water and the controlling factors of the base-level cycle at different levels are discussed in the four aspects of the degree of sandstone fusion and the pattern and thickness of the sediment. The pelagic mudstone, which is rich in organic matter and permethrin fossils, is the interface of the long-term base-level cycle. A thin layer of mudstone siltstone with a lateral spread of thousands to tens of thousands of meters is the interface of the intermediate base-level cycle. Each intermediate cycle consists of several superimposed upward thickening cycles. The single upward thickening cycle usually begins with the thin mudstone intercalated siltstone at the bottom and gradually changes up to the thick non-structural sandstone, which is usually 0.57m thick and can extend steadily from several hundred meters to several thousand meters, reflecting the continuous pre-accumulation of the flower leaf body.
【作者单位】： 北京大学地球与空间科学学院;甘肃省油气资源研究重点实验室/中国科学院油气资源研究重点实验室;中国石油长城钻探工程技术研究院;中国地质大学(北京)能源学院;
【基金】：中国博士后科学基金资助项目(2016M591016)
【分类号】：P618.13;P539.2
，

本文编号：1527292