Experimental Study of Cement - Sandstone/Shale - Brine - CO2Interactions

Geochemical Transactions

Research Article

Sharon C Torres¹  Walt W McNab¹  Susan A Carroll¹ 

[1] Lawrence Livermore National Laboratory, 7000 East Avenue, 94550, Livermore, CA, USA;

关键词: Sandstone;    Shale;    Wellbore;    Boehmite;    Geochemical Model;   

DOI  :  10.1186/1467-4866-12-9

 received in 2011-03-01, accepted in 2011-11-11,  发布年份 2011

来源: Springer

【 摘 要 】

BackgroundReactive-transport simulation is a tool that is being used to estimate long-term trapping of CO2, and wellbore and cap rock integrity for geologic CO2 storage. We reacted end member components of a heterolithic sandstone and shale unit that forms the upper section of the In Salah Gas Project carbon storage reservoir in Krechba, Algeria with supercritical CO2, brine, and with/without cement at reservoir conditions to develop experimentally constrained geochemical models for use in reactive transport simulations.ResultsWe observe marked changes in solution composition when CO2 reacted with cement, sandstone, and shale components at reservoir conditions. The geochemical model for the reaction of sandstone and shale with CO2 and brine is a simple one in which albite, chlorite, illite and carbonate minerals partially dissolve and boehmite, smectite, and amorphous silica precipitate. The geochemical model for the wellbore environment is also fairly simple, in which alkaline cements and rock react with CO2-rich brines to form an Fe containing calcite, amorphous silica, smectite and boehmite or amorphous Al(OH)3.ConclusionsOur research shows that relatively simple geochemical models can describe the dominant reactions that are likely to occur when CO2 is stored in deep saline aquifers sealed with overlying shale cap rocks, as well as the dominant reactions for cement carbonation at the wellbore interface.

【 授权许可】

CC BY   
© Carroll et al; licensee Chemistry Central Ltd. 2011. This article is published under license to BioMed Central Ltd. This is an Open Access article distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/2.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.