Sequence stratigraphic and petrophysical controls on the oil-reservoirs architecture: A case study from the Cretaceous meqasequence, Gulf of Suez region, Egypt

IF 2.2 4区 地球科学 Q2 GEOSCIENCES, MULTIDISCIPLINARY Journal of African Earth Sciences Pub Date : 2024-09-05 DOI:10.1016/j.jafrearsci.2024.105412
Mohammad A. Sarhan , Amer A. Shehata , Mohamed I. Abdel-Fattah
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Abstract

This research aims to perform a comprehensive examination encompassing sequence stratigraphy and petrophysical assessment of the Cretaceous meqasequence along the Gulf of Suez region. Through an investigation of eight wells, spanning both offshore and onshore fields in the Gulf of Suez Basin, the sequence stratigraphic analysis reveals a division of the Cretaceous meqasequence into two distinct depositional sequences: Early Cretaceous (SQ-1) and Late Cretaceous megasequence. The Early Cretaceous megasequence comprises the Nubia Sandstones, while the Late Cretaceous megasequence includes the siliciclastic/carbonate sediments found within the Raha, Abu Qada, Wata, and Matulla Formations (SQ-2, SQ-3, and SQ-4). The distribution of the Cretaceous megasequences across the study area highlights a significant variation in thickness from the onshore to the offshore regions of the Gulf of Suez. This variation is primarily attributed to tectonic forces that governed both the deposition and erosion of sediments over time. The lowstand systems tracts (LSTs) and highstand systems tracts (HSTs) within both Cretaceous megasequences are characterized by sufficient sand content, making them favorable reservoirs.

Conversely, the transgressive systems tracts (TSTs) are identified as potential reservoir rocks. The analysis of petrophysical properties across different Cretaceous reservoirs reveals that the Early Cretaceous fluvial megasequence exhibits superior reservoir qualities compared to its Late Cretaceous counterpart. However, the Late Cretaceous megasequence comprises reservoirs with multiple levels and diverse petrophysical characteristics. The study offers valuable insights into how petrophysical properties and sequence stratigraphy influence Cretaceous reservoir architecture. Examining the depositional environments and petrophysical evaluation enhances our understanding of reservoir quality and distribution. Furthermore, it guides future exploration activities in the mixed siliciclastic and carbonate multi-level intervals of the Gulf of Suez and nearby basins, aiding in identifying potential hydrocarbon zones and optimizing drilling strategies.

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油藏结构的层序地层学和岩石物理控制:埃及苏伊士湾地区白垩纪meqasequence案例研究
这项研究旨在对苏伊士湾地区白垩纪地层序列进行全面检查,包括地层序列分析和岩石物理评估。通过对苏伊士湾盆地近海和陆上油田的八口油井进行调查,层序地层分析表明,白垩纪地层分为两个不同的沉积层序:早白垩世(SQ-1)和晚白垩世巨型序列。早白垩世大基序包括努比亚砂岩,而晚白垩世大基序包括拉哈、阿布卡达、瓦塔和马图拉地层(SQ-2、SQ-3 和 SQ-4)中的硅碎屑/碳酸盐沉积物。白垩纪巨型地层在整个研究区域的分布凸显了苏伊士湾从陆地到近海区域在厚度上的显著差异。这种变化主要归因于沉积物随时间沉积和侵蚀的构造作用。两个白垩纪巨型序列中的低地层系统带(LST)和高地层系统带(HST)都具有足够的含沙量,是有利的储层。对不同白垩纪储层岩石物理特性的分析表明,早白垩世河道巨序列的储层质量优于晚白垩世的同类巨序列。然而,晚白垩世巨型层序由具有多层次和不同岩石物理特征的储层组成。这项研究为了解岩石物理特性和层序地层如何影响白垩纪储层结构提供了宝贵的见解。对沉积环境和岩石物理评价的研究加深了我们对储层质量和分布的了解。此外,它还为今后在苏伊士湾及附近盆地的混合硅质岩和碳酸盐岩多层间的勘探活动提供了指导,有助于确定潜在的油气区并优化钻井策略。
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来源期刊
Journal of African Earth Sciences
Journal of African Earth Sciences 地学-地球科学综合
CiteScore
4.70
自引率
4.30%
发文量
240
审稿时长
12 months
期刊介绍: The Journal of African Earth Sciences sees itself as the prime geological journal for all aspects of the Earth Sciences about the African plate. Papers dealing with peripheral areas are welcome if they demonstrate a tight link with Africa. The Journal publishes high quality, peer-reviewed scientific papers. It is devoted primarily to research papers but short communications relating to new developments of broad interest, reviews and book reviews will also be considered. Papers must have international appeal and should present work of more regional than local significance and dealing with well identified and justified scientific questions. Specialised technical papers, analytical or exploration reports must be avoided. Papers on applied geology should preferably be linked to such core disciplines and must be addressed to a more general geoscientific audience.
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