Mohamed Hadeel, Mabrouk Walid M, Metwally Ahmed
Geophysics Department, Faculty of Science, Cairo University, Giza, 12613, Egypt.
Sci Rep. 2024 Nov 5;14(1):26841. doi: 10.1038/s41598-024-77371-0.
In the northern section of the Western Desert, there are many extremely profitable petroleum and natural gas deposits in the Abu EL-Gharadig Basin. This study aims to highlight the hydrocarbon potential of Abu Roash F Formation, which stands for high organic content unconventional tight reservoirs, and Abu Roash G Formation which stands for conventional sand reservoirs, in Sitra field located in the central-western part of the Abu EL-Gharadig Basin. The research employed well-log data from four wells to ascertain petrophysical properties combined with core samples of two wells for a comprehensive examination and description of lithology. Initially, we commenced the execution of petrophysical analysis, encompassing log quality control procedures. Subsequently, we identified and revealed zones of interest and hydrocarbon indicators in both formations. Additionally, we ascertained the three most influential parameters, shale Volume, effective Porosity, and water saturation, which serve as defining factors for reservoir quality. Subsequently, an examination of the core samples, which encompassed lithologic description, lithofacies analysis, paleoenvironmental interpretation, petrographic analysis, and porosity assessment is conducted. For the sake of a more accurate interpretation, we conclude our research with cartographic maps created to evaluate the geographical distribution of hydrocarbon potential based on petrophysical characteristics, Distribution of the net-to-gross ratio among wells by correlating the litho-saturation models (rock models) for the four wells. The foregoing results declare that The Abu Roash F carbonate-rich rocks are a contender for unconventional tight oil reservoir potential with thin secondary porosity and high organic content, which normally requires a kind of hydraulic fracturing for prospective oil extraction, Furthermore, the upper section of Abu Roash G formation, particularly in well sitra8-03, has highly favorable conventional reservoir characteristics.
在西部沙漠的北部，阿布埃尔-加拉迪格盆地有许多极具盈利潜力的石油和天然气矿床。本研究旨在突出阿布埃尔-加拉迪格盆地中西部锡特拉油田中代表高有机含量非常规致密油藏的阿布罗什F组以及代表常规砂岩油藏的阿布罗什G组的油气潜力。该研究利用四口井的测井数据来确定岩石物理性质，并结合两口井的岩芯样本对岩性进行全面检查和描述。首先，我们开始进行岩石物理分析，包括测井质量控制程序。随后，我们识别并揭示了两个地层中的感兴趣区域和油气指标。此外，我们确定了三个最具影响力的参数，即页岩体积、有效孔隙度和含水饱和度，它们是储层质量的决定性因素。随后，对岩芯样本进行了检查，包括岩性描述、岩相分析、古环境解释、岩石学分析和孔隙度评估。为了进行更准确的解释，我们通过绘制地图来结束我们的研究，这些地图用于根据岩石物理特征评估油气潜力的地理分布，通过关联四口井的岩性-饱和度模型（岩石模型）来确定井间净毛比的分布。上述结果表明，富含碳酸盐的阿布罗什F组岩石具有成为非常规致密油藏的潜力，其具有次生孔隙薄且有机含量高的特点，通常需要某种水力压裂才能进行预期的石油开采。此外，阿布罗什G组的上部，特别是在锡特拉8-03井，具有非常有利的常规储层特征。
