Coupled chemo-mechanical behavior of CO2 mineral trapping in the reservoir sandstones during CO2-EWR

doi:10.1007/s12665-019-8416-8

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	Coupled chemo-mechanical behavior of CO2 mineral trapping in the reservoir sandstones during CO2-EWR
	Zheng, Hong ; Feng, Xia-Ting ; Li, Shaojun ; Qiu, Shili ; Wang, Bin
刊名	ENVIRONMENTAL EARTH SCIENCES
	2019
卷号	78 期号:15 页码:-
关键词	CO2 mineralization sequestration Pressure solution Pore pressure Seepage-creep test Geometrical model
ISSN号	1866-6280
DOI	10.1007/s12665-019-8416-8
英文摘要	Carbon dioxide (CO2) sequestration in deep saline aquifers is regarded as a potentially useful method of storing CO2 due to their large storage capacity. CO(2-)trapping mechanisms in such aquifers include solubility trapping, hydrodynamic trapping, structural trapping, and mineral trapping. CO2-water-rock interactions occurring in saline aquifers injected with CO2 are known to play a vital role in these trapping mechanisms. Stress is known to have a significant and positive effect on mineral dissolution, and therefore, pressure solution as a coupled chemo-mechanical behavior could make an important contribution to mineral trapping. Geological storage of CO2 can also be combined with enhanced water recovery (EWR) from deep saline aquifers, a process referred to as CO2-EWR. By exploiting the fluid during CO2-EWR, the pore pressure in the reservoir is altered, which could enhance pressure solution between the mineral grains in the reservoir. In this work, the role played by pore pressure in CO2 mineral trapping from the perspective of pressure solution as a chemo-mechanical coupling process is investigated. To achieve this, seepage-creep tests were performed on sandstone specimens by passing CO2-NaCl solutions through them at different pore pressures. Experimental results show that the lower the pore pressure a specimen is subjected to, the greater the amount of carbon trapped in the sandstone. On the basis of this result, a geometrical model is established for pressure solution in the materials used that quantitatively describes the mechanism responsible for pressure solution. Geometrical model is then used to analyze the effects of the various factors affecting the role played by pressure solution in CO2 mineralization sequestration (mineral type, pore pressure, porosity, and particle size). The results of the analysis are particularly instructive for the evaluation of long-term CO2 storage in terms of pressure solution. As for CO2-EWR, apart from relieving pressure buildup, increasing CO2 injection, regulating CO2 migration, and restricting CO2 leakage, it also enjoys the advantage of enhancing mineral trapping.
WOS研究方向	Environmental Sciences & Ecology ; Geology ; Water Resources
语种	英语
WOS记录号	WOS:000477956600004
内容类型	期刊论文
源URL	[http://119.78.100.198/handle/2S6PX9GI/14928]
专题	岩土力学所知识全产出_期刊论文
作者单位	1.Chinese Acad Sci, Inst Rock & Soil Mech, State Key Lab Geomech & Geotech Engn, Wuhan 430071, Hubei, Peoples R China; 2.Northeastern Univ, Key Lab, Minist Educ Safe Min Deep Met Mines, Shenyang 110819, Liaoning, Peoples R China
推荐引用方式 GB/T 7714	Zheng, Hong,Feng, Xia-Ting,Li, Shaojun,et al. Coupled chemo-mechanical behavior of CO2 mineral trapping in the reservoir sandstones during CO2-EWR[J]. ENVIRONMENTAL EARTH SCIENCES,2019,78(15):-.
APA	Zheng, Hong,Feng, Xia-Ting,Li, Shaojun,Qiu, Shili,&Wang, Bin.(2019).Coupled chemo-mechanical behavior of CO2 mineral trapping in the reservoir sandstones during CO2-EWR.ENVIRONMENTAL EARTH SCIENCES,78(15),-.
MLA	Zheng, Hong,et al."Coupled chemo-mechanical behavior of CO2 mineral trapping in the reservoir sandstones during CO2-EWR".ENVIRONMENTAL EARTH SCIENCES 78.15(2019):-.