油藏建模工具在设计地下流体注入方法（例如二氧化碳驱油）方面发挥了重要作用。然而，这些模型计算成本高昂，需要大量的地质和工程数据，而这些数据在碳利用和封存项目的早期阶段往往难以获得。本文介绍了快速预测模型和优化方法的开发，旨在快速评估成熟油田的二氧化碳驱油和封存作业。
模型描述。韦伯恩油田位于加拿大萨斯喀彻温省南部。韦伯恩油田的石油储量位于一个薄层裂隙碳酸盐岩（最大厚度30米）中，该碳酸盐岩沉积于1350至1450米深的浅层碳酸盐岩陆架环境中。油藏由两个主要单元组成：上部泥灰岩（厚度0至10米）和下部孔隙灰岩（厚度0至20米）。该油田于1956年开始产油。2000年，该油田开始采用二氧化碳混相驱油技术进行提高采收率（EOR），并在部分油井中交替使用二氧化碳和水驱油，以提高采油效率并长期储存二氧化碳。
本文中的Weyburn-Midale CO 2 EOR 模型是 1A 阶段监测和储存项目的一个子区域。
Reservoir modeling tools have played a significant role in designing subsurface fluid-injection methods such as CO2 enhanced oil recovery (EOR). However, these models are computationally expensive, requiring extensive geological and engineering data that often are not available in the early phases of carbon use and storage projects. This work presents the development of fast predictive models and optimization methodologies to evaluate CO2 EOR and storage operations quickly in mature oil fields.
Model Description. The Weyburn oilfield is in southern Saskatchewan, Canada. Weyburn oil reserves are within a thin zone of fractured carbonates (maximum thickness of 30 m) deposited in a shallow carbonate shelf environment at a depth of 1350–1450 m. The reservoir consists of two main units, the upper Marly dolostone (thickness ranging from 0 to 10 m) and the lower vuggy limestone (thickness ranging from 0 to 20 m). Oil production began in 1956. CO2 miscible-flooding EOR was initiated in 2000, alternating with water in some wells to improve oil-recovery efficiency and to store CO2 for the long term.
The Weyburn-Midale CO2 EOR model in this work is a subarea of the Phase 1A monitoring and storage project.
