Characterizing and modeling the Upper Jurassic Arab-D reservoir using outcrop data from Central Saudi Arabia

Geoarabia Pub Date : 2014-04-01 DOI:10.2113/geoarabia190253
H. Eltom, O. Abdullatif, M. Makkawi, A. Abdulraziq
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引用次数: 13

Abstract

Outcrop analogs are used to improve the characterization of reservoir stratigraphy, to understand subsurface facies architecture and heterogeneity, and to overcome the limitations associated with large inter-well spacing within individual oil fields. This study characterized and modeled outcropping strata equivalent to the Upper Jurassic Arab-D carbonate reservoir in Central Saudi Arabia. The study presents qualitative and quantitative sedimentological and petrographic descriptions of lithofacies associations and interprets them within a high-order stratigraphic framework using geostatistical modeling, spectral gamma-ray, geochemistry, petrography and micropaleontology. The sedimentological studies revealed three lithofacies associations, which are interpreted as a gentle slope platform depositional environment comprising nine high-frequency sequences. The biocomponents of the study area show a lower degree of diversity than the subsurface Arab-D reservoir; however, some key biofacies are present and provide indications of the nature of the paleoenvironments. The geochemical results show a strong correlation between the major and trace elements and the reservoir facies, and suggest that the concentrations of elements and their corresponding spectral gamma-ray logs follow the same general upward-shoaling pattern. The 3-D geocellular model captures small-scale reservoir variability, which is reflected in the petrophysical data distribution in the model. This investigation increases the understanding of the stratigraphy of the Arab-D reservoir and provides a general framework for zonation, layering, and lateral stratigraphic correlations.
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利用沙特阿拉伯中部的露头数据对上侏罗统Arab-D储层进行表征和建模
露头类似物用于改善储层地层学特征,了解地下相结构和非均质性,并克服单个油田大井间距的局限性。本研究对沙特阿拉伯中部上侏罗统arabd碳酸盐岩储层的露头地层进行了表征和模拟。该研究对岩相组合进行了定性和定量的沉积学和岩石学描述,并利用地质统计模型、光谱伽玛射线、地球化学、岩石学和微古生物学在高阶地层格架内进行了解释。沉积学研究发现了3组岩相组合,说明该区为由9个高频层序组成的缓坡台地沉积环境。研究区生物组分多样性低于地下Arab-D储层;然而,一些关键的生物相存在,并提供了古环境性质的指示。地球化学结果表明,主微量元素与储层相具有较强的相关性,元素浓度及其对应的伽马能谱测井具有普遍的向上浅滩化规律。三维地胞模型捕获了小尺度储层的变异性,这反映在模型中的岩石物理数据分布中。这项研究增加了对阿拉伯- d油藏地层学的理解,并为分带、分层和横向地层对比提供了一个总体框架。
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来源期刊
Geoarabia
Geoarabia 地学-地球科学综合
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0
审稿时长
>12 weeks
期刊介绍: Cessation. Published from 1996 to 2015, GeoArabia, The Journal of the Middle Eastern Geosciences was a quarterly journal covering the petroleum geosciences in the Middle East. The journal covers subjects such as: - sedimentology - tectonics - geophysics - petroleum reservoir characterization
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