Modeling Tar Sands with Conductive Layer

V. A. Polikarpova, V. A. Kulikov
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Abstract

Summary The goal is to assess the possibilities of electrotomography for the study of heavy oil deposits. The main object of study is the largest tar sand deposit - Alberta (western province of Canada).There are some problems with the production of such oil: 1) Reservoir heterogeneity associated with interlayers of clays and shales. This is a significant obstacle to vertical vapor migration; 2) watercut zones. Based on this, the following tasks arise before the electrotomography: 1) Select tar sand layers and estimate their thickness; 2) Select the conductive horizons (clay, shale, water) that may be present in the oil-bearing strata. The assessment of the capabilities of electrotomography was carried out using simulation with subsequent inversion. Models were created to match the geological structure of the region (Alberta, Canada). Comparing the results of solving the inverse problem (inversion) with the starting model gives this estimate. In the process of modeling, a pole-dipole + dipole-dipole electrotomography unit was used.
具有导电层的沥青砂模型
目的是评估电层析成像技术用于稠油沉积研究的可能性。研究的主要对象是最大的沥青砂矿床-阿尔伯塔省(加拿大西部省份)。页岩油的开发存在以下问题:1)储层非均质性与粘土、页岩夹层有关。这是垂直蒸汽迁移的一个重大障碍;2)含水带。基于此,电层析成像前需要完成以下工作:1)选择沥青砂层并估算其厚度;2)选择可能存在于含油地层中的导电层(粘土、页岩、水)。利用模拟和随后的反演对电断层成像的能力进行了评估。模型是为了匹配该地区(加拿大阿尔伯塔省)的地质结构而创建的。将求解反问题(反演)的结果与初始模型的结果进行比较,给出了这一估计。在建模过程中,使用了一个极-偶极+偶极-偶极电层析单元。
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