Calculation of pressure- and migration-constrained dynamic CO 2 storage capacity of the North Sea Forties and Nelson dome structures
Calculation of pressure- and migration-constrained dynamic CO 2 storage capacity of the North Sea Forties and Nelson dome structures
复制标题
计算北海 Forties 和 Nelson dome 结构的压力和运移约束动态 CO 2 存储能力
DOI：
10.1016/j.ijggc.2016.07.044
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发表时间：
2016
影响因子：
3.9
通讯作者：
Babaei M
中科院分区：
文献类型：
--
作者：
Babaei M
本文对北海Forties和纳尔逊穹隆结构注入CO2进行了数值模拟研究。该研究假设这些结构已完全耗尽其剩余的碳氢化合物，并且盐水已取代其孔隙空间，因此这些结构可被视为盐水含水层。在此假设下，目标是计算四十年代和纳尔逊结构的动态CO2存储容量，并设计一个注入方案，以提高存储利用率。在这样做的时候，首先，详细的地质模型的圆顶结构及其周围的含水层的开发，以代表岩性相协会和属性与岩石物理性质。使用碳氢化合物生产数据在周围含水层支持方面校准地质模型。随后通过两相（盐水和CO2）过程的数值模拟来估计动态存储容量。关键性能指标（KPI），如压力的建立和区域质量分数的CO2，被用来约束注入的情况下，从而导致存储结构的最佳容量利用率。在我们的完全盐水饱和圆顶结构模型中，基于特定的约束条件，即圆顶外部进入上部压力单元的总气态CO2的<0.1%，以及初始静水压力的66%作为井底压力的允许增加，我们获得了Forties结构的1.21亿吨动态容量和纳尔逊结构的2400万吨动态容量。当在模拟中考虑残余油、气和水的三相模型时，这些值会发生变化。
This paper presents a numerical simulation study of CO2injection into the Forties and Nelson dome structures in the North Sea. The study assumes that these structures are fully depleted of their remaining hydrocarbon and brine has replaced their pore space, and therefore the structures can be treated as saline aquifers. Under this assumption, the objective is to calculate the dynamic CO2storage capacity of the Forties and Nelson structures and design an injection scenario to enhance storage utilisation. In doing so, first, a detailed geological model of the dome structures and their surrounding aquifer is developed to represent the lithological facies associations and attribute them with petrophysical properties. The geological model is calibrated in terms of the surrounding aquifer support using the hydrocarbon production data. The dynamic storage capacity is subsequently estimated by numerical simulation of the two-phase (brine and CO2) process. Key performance indicators (KPIs), such as the pressure build-up and regional mass fraction of CO2, are used to constrain the injection scenarios that consequently result in the best capacity utilisation of the storage structures. In our model of fully brine saturated dome structures, based on specific constraints, namely <0.1% of the total gaseous CO2outside the dome into an upper pressure unit and 66% of the initial hydrostatic pressure as the allowable increase in the bottom-hole pressure, we obtained a dynamic capacity of 121 million tonnes for the Forties structure and 24 million tonnes for the Nelson structure. These values are subject to change when a three phase model of residual oil, gas and water is considered in simulations.