Sensitivity analysis of CO2 sequestration in saline aquifers
Sensitivity analysis of CO2 sequestration in saline aquifers
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DOI：
10.1007/s12182-010-0080-2
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发表时间：
2010-08
影响因子：
5.6
通讯作者：
Hongjun Zhao;X. Liao;Yanfang Chen;Xiaoliang Zhao
中科院分区：
文献类型：
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作者：
Hongjun Zhao;X. Liao;Yanfang Chen;Xiaoliang Zhao
碳捕获与封存（CCS）技术被认为是减少温室气体排放和减缓全球气候变化的重要方法。目前正在考虑在地下地层中大规模储存二氧化碳的三种主要选择：油气藏、深层咸水层和煤层。世界各地有很多大型咸水含水层，它们可以为缓解全球变暖做出巨大贡献。然而，我们对咸水层的了解远少于对油气藏的了解。深层咸水含水层储存二氧化碳涉及多种机制，但将二氧化碳注入含盐水的含水层的最终目标是将二氧化碳溶解在水中。因此研究CO2在咸水层中的溶解度捕获及其敏感性因素具有重要意义。本文介绍了使用商业储层模拟器 ECLIPSE 对盐水含水层中二氧化碳储存进行建模的结果。本研究的目的是更好地了解 CO2/盐水相行为（PVT 特性）并定量估计盐水溶解捕集中最重要的 CO2 存储机制。这将通过进行理论和数值研究提供一种工具，帮助了解二氧化碳地质封存的可行性。三维、两相（水/气）概念储层模型使用有限、均质和等温地层，其中二氧化碳以恒定速率注入。研究了纵横向渗透率比kv/kh、盐度、残余相饱和度等主要参数的影响。结果表明，纵横向渗透率比对CO2封存有显着影响。此外，在较低的 kv/kh 值下，更多的 CO2 溶解在盐水中。
Carbon capture and storage (CCS) technology has been considered as an important method for reducing greenhouse gas emissions and for mitigating global climate change. Three primary options are being considered for large-scale storage of CO2in subsurface formations: oil and gas reservoirs, deep saline aquifers, and coal beds. There are very many large saline aquifers around the world, which could make a big contribution to mitigating global warming. However, we have much less understanding of saline aquifers than oil and gas reservoirs. Several mechanisms are involved in the storage of CO2in deep saline aquifers, but the ultimate goal of injection of CO2into the aquifers containing salt water is to dissolve the CO2in the water. So it is important to study the solubility trapping and sensitivity factors of CO2in saline aquifers. This paper presents results of modeling CO2storage in a saline aquifer using the commercial reservoir simulator ECLIPSE. The objective of this study was to better understand the CO2/brine phase behavior (PVT properties) and quantitatively estimate the most important CO2storage mechanism in brine-solubility trapping. This would provide a tool by performing theoretical and numerical studies that help to understand the feasibility of CO2geological storage. A 3-dimensional, 2-phase (water/gas) conceptional reservoir model used finite, homogenous and isothermal formations into which CO2is injected at a constant rate. The effects of main parameters were studied, including the vertical to horizontal permeability ratiokv/kh, salinity, and residual phase saturations. The results show that the vertical to horizontal permeability ratio has a significant effect on CO2storage. Moreover, more CO2dissolves in the brine at lowerkv/khvalues.