为评价埃及西北沙漠阿布卡拉迪格盆地卡拉马油田上巴哈里亚-阿布罗阿什 G 层序石油系统而进行的地震、岩石物理和地球化学综合研究

IF 2.2 4区 地球科学 Q2 GEOSCIENCES, MULTIDISCIPLINARY
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引用次数: 0

摘要

本研究的主要目的是对卡拉马油田的仙人掌元古代阿布-罗阿什 G(AR/G)和上巴哈里亚层的碳氢化合物潜力进行划分,并对石油系统要素进行评估。该油田位于阿布卡拉迪格盆地的东南边界,阿布卡拉迪格盆地是非洲西北部的一个著名盆地。我们通过分析总共三十条二维地震剖面、五口井的完整测井记录数据集及其地球化学数据完成了这项研究。工作流程首先说明了主要的地下结构特征,确定了主要的潜在储层及其参数,并检查了可能的源岩的成熟度。地震解释表明,研究区域受到 NE-SW 向反斜构造的影响,同时伴有一组 WNW-ESE 和 NW-SE 向正断层,这些正断层受到晚白垩世期间占主导地位的正压缩反转过程的控制。对测井数据集的分析和处理表明,Abu Roash G(AR/G)和上巴哈里亚(Upper Bahariya)组的储层特征是储层赋存条件从差到好,不同油井的净付油厚度可达 13-50 英尺(平均每口井 13 英尺)。AR/G和上巴哈里亚层的有效孔隙度(∅eff)分别为17.7%和15.6%,AR/G和上巴哈里亚层的平均有效孔隙度(∅eff)分别为17.7%和15.6%。页岩体积 (Vsh) = 17.4 % 和 13.6 %,平均值(±0.5%)。水饱和度(Sw)= 38.9 % 和 39.8 %,而碳氢饱和度(So)的平均值则为 38.9 % 和 39.8 %。烃饱和度 (So) 分别为 60.2 % 和 61.1%)。地球化学和成熟度分析有助于确定侏罗纪哈特巴页岩的潜在成熟源岩(TOC = 0.70-5.67%;S1+S2 = 0.43-5.97 mg/g,Ro = 0.54-1.06%)以及白垩纪源岩(Alam El-Bueib 和 Bahariya 地层)的一些贡献。对卡拉马油田石油体系要素的研究表明,受困碳氢化合物在结构上受到三向倾角封闭、角块、封闭断层以及不透水页岩和石灰岩床的垂直封闭的控制。这一案例研究可应用于埃及西部沙漠其他油田的类似情况,以确定其碳氢化合物潜力和构造环境。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Integrated seismic, petrophysical, and geochemical studies for evaluating the petroleum system of the Upper Bahariya-Abu Roash G sequence in the Karama Field, Abu Gharadig Basin, North Western Desert, Egypt

The main aim of this study is to delineate the hydrocarbon potential and evaluate the petroleum system elements of the Cenomanian Abu Roash G (AR/G) and the Upper Bahariya Members in the Karama Field. It lies at the southeast borders of the Abu Gharadig Basin, a well-known basin in the W.D. to the NE of Africa. We accomplish this study by analyzing a total of thirty 2D seismic profiles, a complete data set of well logs for five wells, and their geochemical data. The workflow starts with illustrating the dominant subsurface structural features, defining the main potential reservoirs and their parameters, and checking the maturity of the probable source rocks. The seismic interpretation indicated that the research area had been influenced by a NE-SW anticlinal structure accompanied by a set of WNW-ESE and NW-SE normal faults that are controlled by the positive compression inversion process that dominated during the Late Cretaceous. Analyzing and processing the well log data sets suggest that the reservoirs of the Abu Roash G (AR/G) and the Upper Bahariya Members are characterized by poor to good reservoir settings with net-pay thickness reaching up to 13–50 feet in the different wells (av. Effective porosity (eff) = 17.7 % and 15.6% for the AR/G and the Upper Bahariya Members, av. Shale volume (Vsh) = 17.4 % and 13.6 %, av. Water saturation (Sw) = 38.9 % and 39.8 %, while av. Hydrocarbon saturation values (So) = 60.2 % and 61.1%, respectively). The geochemical and maturity analyses assisted in determining the potential mature source rocks of the Jurassic Khatatba Shale (TOC = 0.70–5.67%; S1+S2 = 0.43–5.97 mg/g, Ro = 0.54–1.06 %) with some contribution from the Cretaceous sources (Alam El-Bueib and Bahariya Formations). Studying elements of the petroleum regime of the Karama Field indicates that the trapped hydrocarbons are structurally controlled by three-way dip closures, horst blocks, sealing faults, and vertical sealing by impervious shale and limestone beds. This case study could be applied to similar analogs in other oil fields in the Egyptian Western Desert to delineate their hydrocarbon potential and structural setting.

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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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