Carbon mineral trapping is commonly believed to be insignificant relative to other trapping mechanisms, yet, the role of cm-scale intraformational baffles is rarely considered in reservoir scale assessments. The present study aims to reveal conditions governing carbon mineral trapping and its quantification for a range of rock compositions in intraformational baffles. A series of 2-D multiphase reactive transport simulations were set-up to model the geochemical processes occurring at the interface of a baffle and a reservoir rock for a period of 1000 years. The study shows that the presence of baffles with certain rock properties within the reservoir rock can enhance or reduce carbon mineral trapping capacity relative to homogeneous reservoir rocks depending on clay and carbonate mineral content in baffles. The analysis shows that the precipitation of secondary carbonates occurs at the interface of the two rock types. Furthermore, it was found that higher clay and lower carbonate content of the baffle contribute towards enhancing mineral trapping while the mineralogy of reservoir rock does not have an important influence. The results are further utilized to derive averaged mineral composition for the integration of fine scale processes in coarser scale simulations.

通常认为碳矿物捕集相对于其他捕集机制而言微不足道，但是，在储层规模评估中很少考虑使用cm级规模的内部变形挡板的作用。本研究的目的是揭示控制碳矿物捕集的条件及其对构造内折流板中一系列岩石成分的量化。建立了一系列二维多相反应输运模拟，以模拟在挡板和储集岩界面发生的地球化学过程，历时1000年。研究表明，与均质储层岩石相比，储层岩石中存在具有一定岩石性质的折流板可以提高或降低碳矿物的捕集能力，具体取决于折流板中粘土和碳酸盐矿物的含量。分析表明，二次碳酸盐的沉淀发生在两种岩石的界面上。此外，还发现挡板的粘土含量较高和碳酸盐含量较低，有助于增强矿物的捕集作用，而储层岩石的矿物学没有重要的影响。结果可进一步用于得出平均矿物成分，以便在较粗规模的模拟中集成精细过程。