Geomechanical and petrographic assessment of a CO2 storage site: Application to the Acorn CO2 Storage Site, offshore United Kingdom
Geomechanical and petrographic assessment of a CO2 storage site: Application to the Acorn CO2 Storage Site, offshore United Kingdom
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二氧化碳封存场的地质力学和岩相评估：应用于英国近海 Acorn 二氧化碳封存场
DOI：
10.1016/j.ijggc.2019.102923
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发表时间：
2020
影响因子：
3.9
通讯作者：
Allen M
中科院分区：
文献类型：
--
作者：
Allen M
地下流体的提取或注入引起流体压力的波动，从而引起应力条件的波动。了解系统岩性的地质力学强度以及控制它的因素是至关重要的，以便在提取/注入期间保持最佳条件。如果储层或盖层的屈服强度被克服，特别是在应力被放大的近井区域，这些波动可能会通过压实或压实破坏而损害系统。在这里，我们使用了一种新的方法组合来确定储层和盖层岩性的地质力学和岩相学特性，以评估苏格兰东北部近海的Acorn CO2储存站长期注入和储存CO2的适用性。Acorn CO2储存站具有高度多孔和可渗透的砂岩储层，其散装矿物学在富CO2条件下稳定，作为ACT-橡子开发计划的一部分，它非常适合在20年内接受至少152公吨的CO2注入，并在注入后储存>1000年。然而，由于砂岩储层的高孔隙度和低胶结，其具有低屈服强度，并且如果注入速率太高并且应力/压力条件超过其屈服强度，则易于解聚和孔隙度减小。这里提出的结果提供了定量约束的孔隙度减少预期产量发生和CO2注入率的限制。页岩盖层具有高膨胀粘土含量和极低的渗透性，具有理想的碳捕获和储存密封性能。
Extraction or injection of fluids within the subsurface causes fluctuations of fluid pressures and thus stress conditions. It is paramount to have knowledge of the geomechanical strength of a system’s lithologies, and the factors that control it, in order to maintain optimal conditions during extraction/injection. If the yield strengths of the reservoir or caprock are overcome, particularly in the near-wellbore region where stress is amplified, these fluctuations could potentially compromise the system, through compactional or dilatational failure. Here we have used a novel combination of methods to determine the geomechanical and petrographic properties of the reservoir and caprock lithologies to assess suitability of the proposed Acorn CO2Storage Site, offshore north-east Scotland, for long-term injection and storage of CO2.The Acorn CO2Storage Site has a highly porous and transmissible sandstone reservoir, with bulk mineralogy that will be stable under CO2-rich conditions, making it ideal for receiving at least 152 MT CO2injected over ∼20 years and storage of >1000 years post-injection, as part of the ACT-Acorn Development Plan. However, due to the high porosity and low cementation of the sandstone reservoir, it has low yield strength and is vulnerable to disaggregation and porosity-reduction if injection rates are too high and stress/pressure conditions exceed their yield strength. The results presented here provide quantitative constraints on the porosity reduction expected should yield occur and place limits on CO2injection rates. The shale caprock, with a high swelling clay content and very low permeability, present ideal Carbon Capture and Storage seal properties.
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