NDLI: Modelling CO$_{2}$-brine-rock interactions in the Upper Paleozoic formations of Ordos Basin used for CO$

Content Provider	Springer Nature Link
Author	Liu, Hejuan Hou, Zhengmeng Were, Patrick Gou, Yang Xiong, Lun Sun, Xiaoling
Copyright Year	2014
Abstract	Subsurface immobilization and conversion of CO$_{2}$ into solid mineral phases in deep siliciclastic saline formations containing silicate minerals, commonly known as “mineral trapping”, is gaining research attention as a significant option to reduce CO$_{2}$ emissions in the atmosphere. Although mineral trapping of CO$_{2}$ is a long-term process, a combination of short-term results from both laboratory experiments and numerical simulations can lead to some general understanding of the required long-term CO$_{2}$ sequestration mechanisms. This is a 100 year preliminary batch simulation study of four sandstone samples, under CO$_{2}$ saturated water at 75 °C from the Upper Permian formations in the Ordos Basin, using the TOUGHREACT/ECO2N module to simulate the CO$_{2}$-brine-rock interaction processes in deep siliciclastic multilayered saline aquifers. The samples approximately correspond to the four target saline formations selected by the Shenhua Group for a CO$_{2}$ sequestration field demonstration project in the Ordos Basin, PR China. Preliminary simulation results show that the initial salinity of formation brine plays a significant role in determining the amount of CO$_{2}$ that will be sequestered by solubility or mineral trapping in a deep saline aquifer. Minimal differences between experimental results and numerical calculation occur in low salinity waters, and significantly larger differences in high salinity waters, which is still under the maximum acceptable difference between experimental and computed data (10 %). The upper Liujiagou formation, with the highest level of salinity (ca. 88.7 g/L TDS) and lowest level of CO$_{2}$ solubility, offers the highest mineral trapping capacity, with a maximum carbonate mineral storage of ca. 0.7 kg/m$^{3}$ of bulk rock over a 100 year period. Regardless of the initial acidity or alkalinity of the aquifer brine, injection of CO$_{2}$ will inflict a sudden drop in pH of the brine to acidity levels in a range of 3.0–4.6. The subsequent amount of dissolved and precipitated minerals, arising from the CO$_{2}$-brine-rock interaction, is site specific and mainly dependent on initial aquifer mineralogy and brine composition.
Starting Page	2205
Ending Page	2222
Page Count	18
File Format	PDF
ISSN	18666280
Journal	Environmental Earth Sciences
Volume Number	73
Issue Number	5
e-ISSN	18666299
Language	English
Publisher	Springer Berlin Heidelberg
Publisher Date	2014-08-23
Publisher Place	Berlin, Heidelberg
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	CO$_{2}$ sequestration CO$_{2}$-brine-rock interaction Batch simulation The Ordos Basin Geology Hydrology/Water Resources Geochemistry Environmental Science and Engineering Terrestrial Pollution Biogeosciences
Content Type	Text
Resource Type	Article
Subject	Global and Planetary Change Earth-Surface Processes Soil Science Environmental Chemistry Pollution Geology Water Science and Technology

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