干旱区生态环境知识资源中心(Arid): Area of Interest 1, CO<sub>2</sub> at the Interface. Nature and Dynamics of the Reservoir/Caprock Contact and Implications for Carbon Storage Performance

Arid

DOI	10.2172/1177773
来源ID	OSTI_ID: 1177773
	Area of Interest 1, CO₂ at the Interface. Nature and Dynamics of the Reservoir/Caprock Contact and Implications for Carbon Storage Performance
	Mozley, Peter [New Mexico Institute Of Mining And Technology, Socorro, NM (United States)]; Evans, James [New Mexico Institute Of Mining And Technology, Socorro, NM (United States)]; Dewers, Thomas [New Mexico Institute Of Mining And Technology, Socorro, NM (United States)]
英文摘要	We examined the influence of geologic features present at the reservoir/caprock interface on the transmission of supercritical CO₂ into and through caprock. We focused on the case of deformation-band faults in reservoir lithologies that intersect the interface and transition to opening-mode fractures in caprock lithologies. Deformation-band faults are exceeding common in potential CO₂ injection units and our fieldwork in Utah indicates that this sort of transition is common. To quantify the impact of these interface features on flow and transport we first described the sedimentology and permeability characteristics of selected sites along the Navajo Sandstone (reservoir lithology) and Carmel Formation (caprock lithology) interface, and along the Slickrock Member (reservoir lithology) and Earthy Member (caprock lithology) of the Entrada Sandstone interface, and used this information to construct conceptual permeability models for numerical analysis. We then examined the impact of these structures on flow using single-phase and multiphase numerical flow models for these study sites. Key findings include: (1) Deformation-band faults strongly compartmentalize the reservoir and largely block cross-fault flow of supercritical CO₂. (2) Significant flow of CO₂ through the fractures is possible, however, the magnitude is dependent on the small-scale geometry of the contact between the opening-mode fracture and the deformation band fault. (3) Due to the presence of permeable units in the caprock, caprock units are capable of storing significant volumes of CO₂, particularly when the fracture network does not extend all the way through the caprock. The large-scale distribution of these deformation-bandfault-to-opening-mode-fractures is related to the curvature of the beds, with greater densities of fractures in high curvature regions. We also examined core and outcrops from the Mount Simon Sandstone and Eau Claire Formation reservoir/caprock interface in order to extend our work to a reservoir/caprock pair this is currently being assessed for long-term carbon storage. These analyses indicate that interface features similar to those observed at the Utah sites 3 were not observed. Although not directly related to our main study topic, one byproduct of our investigation is documentation of exceptionally high degrees of heterogeneity in the pore-size distribution of the Mount Simon Sandstone. This suggests that the unit has a greater-than-normal potential for residual trapping of supercritical CO₂.
出版年	2014
报告类型	Technical Report
语种	英语
国家	美国
URL	http://www.osti.gov/scitech/servlets/purl/1177773
资源类型	科技报告
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/271054
推荐引用方式 GB/T 7714	Mozley, Peter [New Mexico Institute Of Mining And Technology, Socorro, NM ,Evans, James [New Mexico Institute Of Mining And Technology, Socorro, NM ,Dewers, Thomas [New Mexico Institute Of Mining And Technology, Socorro, NM . Area of Interest 1, CO₂ at the Interface. Nature and Dynamics of the Reservoir/Caprock Contact and Implications for Carbon Storage Performance,2014.