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Quantification of CO2 Mineralization at the Wallula Basalt Pilot Project.
Environmental Science & Technology ( IF 10.8 ) Pub Date : 2020-09-11 , DOI: 10.1021/acs.est.0c05142
Signe K White 1 , Frank A Spane 1 , H Todd Schaef 2 , Quin R S Miller 2 , Mark D White 1 , Jake A Horner 1 , B Peter McGrail 1
Affiliation  

In 2013, the Pacific Northwest National Laboratory led a geologic carbon sequestration field demonstration where ∼1000 tonnes of CO2 was injected into several deep Columbia River Basalt zones near Wallula, Washington. Rock core samples extracted from the injection zone two years after CO2 injection revealed nascent carbonate mineralization that was qualitatively consistent with expectations from laboratory experiments and reactive transport modeling. Here, we report on a new detailed analysis of the 2012 pre-injection and 2015 post-injection hydrologic tests that capitalizes on the difference in fluid properties between scCO2 and water to assess changes in near-field, wellbore, and reservoir conditions that are apparent approximately two years following the end of injection. This comparative hydrologic test analysis method provides a new way to quantify the amount of injected CO2 that was mineralized in the field test. Modeling results indicate that approximately 60% of the injected CO2 was sequestered via mineralization within two years, with the resulting carbonates occupying ∼4% of the available reservoir pore space. The method presented here provides a new monitoring tool to assess the fate of CO2 injected into chemically reactive basalt formations but could also be adapted for long-term monitoring and verification within more traditional subsurface carbon storage reservoirs.

中文翻译:

Wallula玄武岩试点项目中的二氧化碳矿化定量。

2013年,太平洋西北国家实验室领导了地质碳固存现场演示,向华盛顿州Wallula附近的哥伦比亚哥伦比亚玄武岩深部地区注入了约1000吨CO 2。在注入CO 2两年后从注入区提取的岩心样品显示出新生的碳酸盐矿化在质量上与实验室实验和反应性运输模型的预期一致。在这里,我们报告了2012年注入前和2015年注入后水文测试的新详细分析,该分析利用了scCO 2之间的流体性质差异注入水,以评估注入结束约两年后近场,井筒和储层条件的变化。这种比较水文测试分析方法提供了一种新方法,可以量化在现场测试中矿化的注入CO 2的量。模拟结果表明,两年内约有60%的注入CO 2通过矿化作用被隔离,生成的碳酸盐约占可用储集层孔隙空间的约4%。本文介绍的方法提供了一种新的监测工具,可评估注入化学反应性玄武岩地层中的CO 2的去向,但也可适用于在更传统的地下碳储层中进行长期监测和验证。
更新日期:2020-11-17
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