Migration and storage characteristics of supercritical CO2 in anisotropic sandstones with clay interlayers based on X-CT experiments

doi:10.1016/j.jhydrol.2019.124239

	Migration and storage characteristics of supercritical CO2 in anisotropic sandstones with clay interlayers based on X-CT experiments
	Xu, Liang 2,3; Myers, Matthew 1; Li, Qi 2,3; White, Cameron 1; Zhang, Xiaoyan 2,3
刊名	JOURNAL OF HYDROLOGY
	2020
卷号	580 页码:17
关键词	Geologic CO2 storage Anisotropic sandstone Clay interlayer X-CT Core flooding experiment
ISSN号	0022-1694
DOI	10.1016/j.jhydrol.2019.124239
英文摘要	To date, many laboratory-based core scale (i.e. flooding) studies have focused on relatively homogeneous rock samples (e.g. Berea sandstone) to study the migration characteristics of supercritical carbon dioxide (SC-CO2) and evaluate these rocks for their potential geological CO2 storage. Clay interlayers with low porosity and permeability developed in sandstones are often encountered in target reservoirs and can have an obvious influence on the distribution of injected SC-CO2 and the overall storage capacity of the reservoir. To understand the impact of clay interlayers (which act as thin layers of low porosity/permeability rock with the surrounding rock being relatively homogeneous with much higher porosity/permeability), samples containing these interlayers were cored in two different orientations and both samples were subjected to core flooding experiments. A high-resolution X-ray computed tomography (X-CT) scanner was used to monitor the behavior of the fluid inside the samples during the experiment. Using X-CT iamges and differential pressure data, the migration and distribution characteristics of SC-CO2 inside the samples during the drainage process (i.e. the process where SC-CO2 displaces brine) are analyzed. The results show that the drainage process for both samples occurs in three steps: channel creation, channel extension and channel stabilization. However, we find that the orientation of the clay interlayer has a significant effect on the SC-CO(2 )migration characteristics and storage capacity and that the SC-CO2 generally avoids the clay interlayer during drainage. When the injection direction is parallel to the clay interlayer, it acts like a shunt to separate the SC-CO2 flow and any fingering phenomenon is separated on either side of the clay interlayer with little crossflow. When the injection direction is nearly perpendicular to the clay interlayer, it acts as a barrier which prevents SC-CO2 moving ahead and affects the pressure propagation. The final distribution of SC-CO2 resembles sweep behavior before the clay interlayer; however, fingering phenomenon occurs after the clay interlayer. The displacement efficiency and storage capacity decreased by 43.14% and 40.74% by changing the orientation of a less than one-millimeter thick clay interlayer vertical to the flooding direction.
资助项目	National Natural Science Foundation of China[41872210] ; National Natural Science Foundation of China[41274111] ; State Key Laboratory of Geomechanics and Geotechnical Engineering, IRSM, CAS[Z017002]
WOS研究方向	Engineering ; Geology ; Water Resources
语种	英语
出版者	ELSEVIER
WOS记录号	WOS:000509620900002
内容类型	期刊论文
源URL	[http://119.78.100.198/handle/2S6PX9GI/23501]
专题	中科院武汉岩土力学所
通讯作者	Li, Qi
作者单位	1.Australian Resources Res Ctr, CSIRO Energy, 26 Dick Perry Ave, Kensington, WA 6151, Australia 2.Univ Chinese Acad Sci, Beijing 100049, Peoples R China 3.Chinese Acad Sci, Inst Rock & Soil Mech, State Key Lab Geomech & Geotech Engn, Wuhan 430071, Peoples R China
推荐引用方式 GB/T 7714	Xu, Liang,Myers, Matthew,Li, Qi,et al. Migration and storage characteristics of supercritical CO2 in anisotropic sandstones with clay interlayers based on X-CT experiments[J]. JOURNAL OF HYDROLOGY,2020,580:17.
APA	Xu, Liang,Myers, Matthew,Li, Qi,White, Cameron,&Zhang, Xiaoyan.(2020).Migration and storage characteristics of supercritical CO2 in anisotropic sandstones with clay interlayers based on X-CT experiments.JOURNAL OF HYDROLOGY,580,17.
MLA	Xu, Liang,et al."Migration and storage characteristics of supercritical CO2 in anisotropic sandstones with clay interlayers based on X-CT experiments".JOURNAL OF HYDROLOGY 580(2020):17.