新近系生物层序地层学——以埃及尼罗河三角洲El-Wastani气田为例

IF 4.1 3区 地球科学 Q1 PALEONTOLOGY Journal of Micropalaeontology Pub Date : 2023-10-04 DOI:10.5194/jm-42-147-2023
Ramadan M. El-Kahawy, Nabil Aboul-Ela, Ahmed N. El-Barkooky, Walid G. Kassab
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引用次数: 0

摘要

摘要由于现代油气开发和勘探活动在埃及尼罗河三角洲的陆上进行,为了说明含气储层的沉积层序,对新近系进行了高分辨率的生物年代层序地层学研究。我们的研究采用多学科方法,包括生物地层学、相分析、地球物理测井和地震数据,以阐明新近纪地层格架。通过对浮游有孔虫和钙质纳米化石的生物地层分析,分别划分出6个带和(或)亚带和9个带。中-上中新统西迪塞勒姆组为开陆架环境,而上中新统Qawasim组和Abu Madi组为河口相的应力环境。下上新世(赞新世)序列沉积于陆架中部至外陆架域,包括上深海环境。从塞拉瓦利世到赞清世,共划分出6个主要层序边界的7个沉积层序。这些边界显著地影响了切谷填充物的储层性质和结构的变化。海平面振荡是通过将层序边界和洪水面与全球起伏图相关联来解释的。
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Bio-sequence stratigraphy of the Neogene: an example from El-Wastani gas field, onshore Nile Delta, Egypt
Abstract. Due to modern hydrocarbon development and exploration activities throughout the onshore Nile Delta of Egypt, a high-resolution biochronologic sequence stratigraphy of the Neogene sequence was conducted to illustrate the gas-bearing reservoirs' depositional sequences. Our study used a multidisciplinary approach comprising biostratigraphy, facies analysis, geophysical logs, and seismic data to shed light on the Neogene stratigraphic framework. The biostratigraphic analysis of planktonic foraminifera and calcareous nannofossils allowed the recognition of six zones and/or subzones and nine zones, respectively. An open-shelf environment was suggested for the Middle–Upper Miocene Sidi Salem Formation, while the Upper Miocene Qawasim and Abu Madi formations were deposited under stressed environmental conditions interpreted as estuary facies. The Lower Pliocene (Zanclean) succession deposited in the middle to outer shelf domains, including the upper-bathyal environments. Seven depositional sequences bounded by six major sequence boundaries were recognized from Serravallian to Zanclean times. These boundaries significantly influenced changes in reservoir properties and architecture of the incised valley fills. The sea-level oscillations are interpreted by correlating the sequence boundaries and flooding surfaces with global eustatic charts.
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来源期刊
Journal of Micropalaeontology
Journal of Micropalaeontology 生物-古生物学
CiteScore
4.30
自引率
5.00%
发文量
7
审稿时长
>12 weeks
期刊介绍: The Journal of Micropalaeontology (JM) is an established international journal covering all aspects of microfossils and their application to both applied studies and basic research. In particular we welcome submissions relating to microfossils and their application to palaeoceanography, palaeoclimatology, palaeobiology, evolution, taxonomy, environmental change and molecular phylogeny.
期刊最新文献
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