Abstract The present study aims at conducting a detailed reservoir characterization of the Early Cretaceous Bentiu and Abu Gabra formations in Muglad basin which is one of the most prospective hydrocarbon basins in South Kordofan, SW Sudan. This can be achieved through integration between well logging (conventional), petrography (thin sections, and scanning electron microscopy SEM), and core data. Based on this integrated study, the Abu Gabra-Bentiu sequence is composed of two reservoir rock types (RRTs). RRT1 is composed of quartz arenite, whereas RRT2 is composed of quartz wacke. The best storage and flow capacities and the best reservoir quality are assigned for RRT1 due to its good to excellent porosity (20.0 ≤ ∅ ≤ 34.1%), permeability (138 ≤ k ≤ 4140 md), reservoir quality index (0.61 ≤ RQI ≤ 2.91 μm), and flow zone indicator (2.37 ≤ FZI ≤ 6.12 μm) values. This rock type is mostly assigned to two hydraulic flow units (HFU-1, and HFU-2) of Bentiu Formation which comprises 95% of the flow capacity of the sequence. The average reservoir parameters of the studied sequence, including shale volume, effective porosity and hydrocarbon saturation, equal to 31.6, 16.2 and 39.5%, respectively with 29.5 m as a total net-pay thickness. Petrographically, the relatively low contribution of the Abu Gabra Formation is due to its authigenic mineral content, compaction, and cementation.

中文翻译：

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岩石类型和水力流动单元是苏丹西南部穆格莱德盆地 Bentiu-Abu Gabra 层序储层表征的成功工具

摘要 本研究旨在对穆格莱德盆地早白垩世 Bentiu 和 Abu Gabra 地层进行详细的储层描述，穆格莱德盆地是苏丹西南部南科尔多凡州最有前景的油气盆地之一。这可以通过测井（常规）、岩相学（薄片和扫描电子显微镜 SEM）和岩心数据之间的集成来实现。根据这项综合研究，Abu Gabra-Bentiu 层序由两种储层岩石类型 (RRT) 组成。RRT1 由石英砂岩组成，而 RRT2 由石英砂组成。由于 RRT1 具有良好至极好的孔隙度 (20.0 ≤ ∅ ≤ 34.1%)、渗透率 (138 ≤ k ≤ 4140 md)、储层质量指数 (0.61 ≤ RQI ≤ 2.91)，因此具有最佳的储存和流动能力以及最佳的储层质量μm) 和流区指示器 (2.37 ≤ FZI ≤ 6. 12 μm) 值。这种岩石类型主要分配给 Bentiu 组的两个水力流动装置（HFU-1 和 HFU-2），它们占该层序流动能力的 95%。研究层序的平均储层参数，包括页岩体积、有效孔隙度和烃饱和度，分别等于31.6、16.2和39.5%，总净油层厚度为29.5 m。在岩相学上，Abu Gabra 组的贡献相对较低是由于其自生矿物含量、压实和胶结作用。2 和 39.5%，总净产层厚度为 29.5 m。在岩相学上，Abu Gabra 组的贡献相对较低是由于其自生矿物含量、压实和胶结作用。2 和 39.5%，总净产层厚度为 29.5 m。在岩相学上，Abu Gabra 组的贡献相对较低是由于其自生矿物含量、压实和胶结作用。