TECTONIC AND EROSION FEATURES, AND THEIR INFLUENCE ON ZONAL DISTRIBUTION OF THE UPPER TRIASSIC AND THE LOWER CRETACEOUS SEDIMENTS IN THE EUPHRATES GRABEN AREA, SYRIA

IF 0.8 Q4 GEOCHEMISTRY & GEOPHYSICS

Geodynamics & Tectonophysics Pub Date : 2021-09-17 DOI:10.5800/gt-2021-12-3-0541

I. Yousef, V. Morozov, Mohammad El Kadi, A. Alaa

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引用次数: 3

Abstract

We have investigated the tectonic and erosion features of the Upper Triassic (Mulussa F Formation) and Lower Cretaceous (Rutbah Formation) sediments in the Euphrates graben area and analysed their influence on changes in the thickness and zonal distribution patterns of these sediments. In this study, the geological modeling software of Petrel Schlumberger is used to model the regional geological structure and stratigraphy from the available geological and geophysical data.The Upper Triassic and Lower Cretaceous sediments (in total, almost 800 m thick) are the major hydrocarbon reservoirs in the Euphrates graben, which contain approximately 80 to 90 % of the total hydrocarbon reserve in this area. These sedimentary zones experienced variable changes in thickness and zonal distribution due to erosion processes caused by the two major regional unconformities, the Base Upper Cretaceous (BKU) and Base Lower Cretaceous (BKL) unconformities. The maximum thickness of the Upper Triassic sediments amounts to 480 m in the central parts of the Euphrates graben and along the NW-SE trend, i.e. in the dip direction of the Upper Triassic Mulussa F Formation. Towards the NE flank of the graben near the Khleissia uplift and the SW flank near to the Rutbah uplift, the thickness of the Upper Triassic sediments is gradually decreased due to their partial or total erosion caused by the BKL unconformity, and also due to a less space for sediment accumulation near the uplifts. The thickness of the Lower Cretaceous sediments increases in the northern, NW and NE flanks of the graben. Their maximum thickness is about 320 m. The BKL unconformity is the major cause of erosion of the Lower Cretaceous sediments along the southern, SE and SW flanks of the graben. In the Jora and Palmyra areas towards the NW flank of the Euphrates graben, the Upper Triassic and Lower Cretaceous sediments show no changes in thickness. In these areas, there was more space for sediment accumulation, and the sediments were less influenced by the BKL and BKU unconformities and thus less eroded.

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叙利亚幼发拉底河地堑地区构造与侵蚀特征及其对上三叠统和下白垩统沉积物分带分布的影响

研究了幼发拉底河地堑地区上三叠统(Mulussa F组)和下白垩统(Rutbah组)沉积物的构造和侵蚀特征，并分析了它们对沉积物厚度变化和分带分布模式的影响。本研究利用海燕斯伦贝谢公司的地质建模软件，利用现有的地质和地球物理资料，对区域地质构造和地层进行建模。上三叠统和下白垩统沉积物(总厚度约为800 m)是幼发拉底河地堑的主要油气储集层，约占该地区总油气储量的80 - 90%。由于基底上白垩统(BKU)和基底下白垩统(BKL)两个主要区域不整合面造成的侵蚀作用，这些沉积带的厚度和分带分布发生了变化。幼发拉底河地堑中部上三叠统沉积物最大厚度为480 m，沿NW-SE走向，即上三叠统Mulussa F组倾斜方向。在靠近Khleissia隆起的地堑北侧和靠近Rutbah隆起的地堑西南侧，由于BKL不整合对上三叠统沉积物的部分或全部侵蚀，以及隆起附近沉积物堆积空间的减小，上三叠统沉积物的厚度逐渐减小。断陷北、北西、东三侧下白垩统沉积物厚度增加。它们的最大厚度约为320米。BKL不整合是导致下白垩统地堑南侧、东南侧和西南侧沉积物被侵蚀的主要原因。在幼发拉底河地堑西北侧的Jora和Palmyra地区，上三叠统和下白垩统的沉积物厚度没有变化。这些地区沉积物聚集空间较大，受BKL和BKU不整合面影响较小，受侵蚀程度较小。

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来源期刊

Geodynamics & Tectonophysics GEOCHEMISTRY & GEOPHYSICS-

CiteScore

1.20

自引率

14.30%

发文量

审稿时长

24 weeks

期刊介绍： The purpose of the journal is facilitating awareness of the international scientific community of new data on geodynamics of continental lithosphere in a wide range of geolchronological data, as well as tectonophysics as an integral part of geodynamics, in which physico-mathematical and structural-geological concepts are applied to deal with topical problems of the evolution of structures and processes taking place simultaneously in the lithosphere. Complex geological and geophysical studies of the Earth tectonosphere have been significantly enhanced in the current decade across the world. As a result, a large number of publications are developed based on thorough analyses of paleo- and modern geodynamic processes with reference to results of properly substantiated physical experiments, field data and tectonophysical calculations. Comprehensive research of that type, followed by consolidation and generalization of research results and conclusions, conforms to the start-of-the-art of the Earth’s sciences.