The integration of multiscale datasets, including seismic, well-logs and stratigraphy, is providing a precise picture about reservoir evaluation and spatial distribution. This study focuses on the seismic interpretation and sequence stratigraphic analysis of the Bahariya Formation in the South Umbaraka oilfields (Selkit, Khepri, and Sethos), located in the Western Desert of Egypt. Seismic interpretations reveal various structural closures, including anticlinal domes and faulted anticlines in different fields. The study area is divided into northern and southern blocks separated by a major fault, and structural cross sections provide valuable information on reservoir zones regarding lateral extension, thickness variation, and fault distribution. The Bahariya Formation is subdivided into two depositional sequences: Lower Bahariya sequence (BAH.SQ-1) and Upper Bahariya sequence (BAH.SQ-2) with distinct wireline-log characteristics, seismic reflections, and lithofacies variations. BAH.SQ-1 comprises mixed siliciclastic-dominated units with some carbonate units, while BAH.SQ-2 consists of mixed siliciclastic and carbonate units. Multiple sequence boundaries, depositional surfaces, and systems tracts are identified within BAH.SQ-1 and BAH.SQ-2, indicating changes in sedimentary environments and sea-level fluctuations. The petrophysical evaluation reveals promising reservoir zones in both the Lower and Upper Bahariya sequences. However, the Lower Bahariya sequence exhibits superior reservoir characteristics in terms of net-pay thickness, shale volume, effective porosity, and water saturation. Particularly, the sandstone-dominated LST-1 within the Lower Bahariya Formation is identified as a favorable reservoir zone. Conversely, the Upper Bahariya Formation has limited reservoir potential. This study underscores the significance of sequence stratigraphy and reservoir architecture, emphasizing the role of faulting, folding, and depositional environments in the distribution and quality of reservoir zones. The findings contribute valuable insights into the structural and stratigraphic characteristics of the Bahariya Formation, enhancing understanding of hydrocarbon plays and reservoir distribution in the studied area.

包括地震、测井和地层学在内的多尺度数据集的整合，提供了有关储层评估和空间分布的精确图像。本研究重点对位于埃及西部沙漠的南 Umbaraka 油田（Selkit、Khepri 和 Sethos）的 Bahariya 组进行地震解释和层序地层分析。地震解释揭示了各种构造闭合，包括不同区域的背斜穹顶和断层背斜。研究区被一条主断层分为南北区块，构造剖面提供了有关储层横向延伸、厚度变化和断层分布等方面的宝贵信息。Bahariya 组又分为两个沉积层序：下Bahariya 层序（BAH.SQ-1）和上Bahariya 层序（BAH.SQ-2），具有不同的测井特征、地震反射和岩相变化。BAH.SQ-1 由混合的硅质碎屑为主的单元和一些碳酸盐单元组成，而 BAH.SQ-2 由混合的硅质碎屑和碳酸盐单元组成。BAH.SQ-1和BAH.SQ-2内识别出多个层序边界、沉积面和体系域，表明沉积环境和海平面波动的变化。岩石物理评价揭示了下Bahariya 层序和上Bahariya 层序的有前景的储层区。然而，下Bahariya层序在净产层厚度、页岩体积、有效孔隙度和含水饱和度方面表现出优越的储层特征。特别是，下Bahariya 组内以砂岩为主的LST-1 被认为是有利的储集层。相反，上Bahariya 地层的储层潜力有限。这项研究强调了层序地层学和储层构型的重要性，强调了断层、褶皱和沉积环境对储层分布和质量的作用。这些发现为巴哈里亚组的结构和地层特征提供了宝贵的见解，增强了对研究区域油气层带和储层分布的了解。