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首页> 外文期刊>Journal of Petroleum Exploration and Production Technology >Formation evaluation and reservoir characteristics of the Messinian Abu Madi sandstones in Faraskour Gas Field, onshore Nile Delta, Egypt
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Formation evaluation and reservoir characteristics of the Messinian Abu Madi sandstones in Faraskour Gas Field, onshore Nile Delta, Egypt

机译：埃及陆地尼罗河三角洲的Messinian Abu Madi Sandstones的Messinian Abu Madi Sandstones的形成评估和水库特征

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摘要

The Messinian Abu Madi Formation represents the most prospective reservoir target in the Nile Delta. Hydrocarbon exploration endeavors in Nile Delta over the last few decades highlighted some uncertainties related to the predictability and distribution of the Abu Madi best reservoir quality facies. Therefore, this study aims at delineating the factors controlling the petrophysical heterogeneity of the Abu Madi reservoir facies in Faraskour Field, northeastern onshore part of the Nile Delta. This work provides the very first investigation on the reservoir properties of Abu Madi succession outside the main canyon system. In the study area, Abu Madi reservoir is subdivided into two sandstone units (lower fluvial and upper estuarine). Compositionally, quartzose sandstones (quartz?>?65%) are more common in the fluvial unit, whereas the estuarine sandstones are often argillaceous (clays?>?15%) and glauconitic (glauconite?>?10%). The sandstones were classified into four reservoir rock types (RRTI, RRTII, RRTIII, and RRTIV) having different petrophysical characteristics and fluid flow properties. RRTI hosts the quartzose sandstones characterized by mega pore spaces (R35?>?45?μm) and a very well-connected, isotropic pore system. On the other side, RRTIV constitutes the lowest reservoir quality argillaceous sandstones containing meso- and micro-sized pores (R35?>?5?μm) and a pore system dominated by dead ends. Irreducible water saturation increases steadily from RRTI (Swir?~?5%) to RRTIV (Swir?>?20%). Additionally, the gas–water two-phase co-flowing characteristics decrease significantly from RRTI to RRTIV facies. The gaseous hydrocarbons will be able to flow in RRTI facies even at water saturation values exceeding 90%. On the other side, the gas will not be able to displace water in RRTIV sandstones even at water saturation values as low as 40%. Similarly, the influence of confining pressure on porosity and permeability destruction significantly increases from RRTI to RRTIV. Accordingly, RRTI facies are the best reservoir targets and have high potentiality for primary porosity preservation.
机译：Messinian Abu Madi Madi形成代表了尼罗河三角洲最前景水库目标。过去几十年尼罗河三角洲的碳氢化合物勘探努力突出了与阿布麦迪斯最佳水库质量相的可预测性和分配有关的一些不确定性。因此，本研究旨在划算控制尼罗河东北部南部部分地区阿布麦迪山区的岩石物理异质性的因素。这项工作为主峡谷系统外的ABU Madi连续的储层性质提供了第一次调查。在研究领域，阿布麦迪储层细分为两种砂岩单位（液体和上河河上层）。合成的，石英砂岩（石英？> 65％）在河流单元中更常见，而河口砂岩通常是骨质（粘土→15％）和青光素（青光糖岩？10％）。砂岩分为四种储层岩石类型（RRTI，RRTII，RRTIII和RRTIV），具有不同的岩石物理特征和流体流动性能。 RRTI主持由Mega孔隙空间的石英糖砂岩（R35？>？45？μm）和一个非常良好连接的各向同性的孔隙系统。另一方面，RRTIV构成了含有中间孔和微尺寸孔的最低储层质量含钙砂岩（R35？> 5？5？μm）和由死角主导的孔系统。不可减少的水饱和度从RRTI（SWIR？〜5％）稳定地增加（SWIR？> 20％）。另外，气水两相流流动特性从RRTI到RRTIV相位显着降低。气态烃即使在超过90％的水饱和度值下也能够在RRTI相中流动。在另一边，即使在低至40％的水饱和度值下，气体也不会在RRTIV砂岩中移除水。类似地，限制压力对孔隙率和渗透性破坏的影响显着增加到RRTI至RRTIV。因此，RRTI相位是最佳的储层目标，并且具有高潜力的主要孔隙度保存。

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