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Reactive Transport Modeling of Long-Term CO2 Sequestration Mechanisms at the Shenhua CCS Demonstration Project, China

Guodong Yang1, Yilian Li*1, Aleks Atrens2, Danqing Liu1, Yongsheng Wang3, Li Jia4, Yu Lu1
1. School of Environmental Studies, China University of Geosciences, Wuhan 430074, China;2. The Queensland Geothermal Energy Centre of Excellence, School of Mechanical and Mining Engineering,The University of Queensland, St Lucia, Qld 4072, AustraliaThe University of Queensland, St Lucia, Qld 4072, Australia,The University of Queensland, St Lucia, Qld 4072, Australia,3. China Shenhua Coal Liquefaction Co., Ltd. Ordos, Ordos 017209, China;4. The Administrative Centre for China's Agenda 21, Beijing 100038, China

ABSTRACT: Carbon dioxide injection into deep saline aquifers results in a variety of strongly coupled physical and chemical processes. In this study, reactive transport simulations using a 2-D radial model were performed to investigate the fate of the injected CO2, the effect of CO2-water-rock interactions on mineral alteration, and the long-term CO2 sequestration mechanisms of the Liujiagou Formation sandstone at the Shenhua CCS pilot site of China. Carbon dioxide was injected at a constant rate of 0.1 Mt/year for 30 years, and the fluid flow and geochemical transport simulation was run for a period of 10,000 years by the TOUGHREACT code according to the underground conditions of the Liujiagou Formation. The results show that different trapping phases of CO2 vary with time. Sensitivity analyses indicate that plagioclase composition and chlorite presence are the most significant determinants of stable carbonate minerals and CO2 mineral trapping capacity. For arkosic arenite in the Liujiagou Formation, CO2 can be immobilized by precipitation of ankerite, magnesite, siderite, dawsonite, and calcite for different mineral compositions, with Ca2+, Mg2+, Fe2+ and Na+ provided by dissolution of calcite, albite (or oligoclase) and chlorite. This study can provide useful insights into the geochemistry of CO2 storage in other arkosic arenite (feldspar rich sandstone) formations at other pilots or target sites.

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Keywords:CCS, CO2 sequestration, geochemical interaction, mineral trapping, Shenhua CCS demonstration project, Reactive transport modeling.

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