Modelling biofilm growth in the presence of carbon dioxide and water flow in the subsurface
Modelling biofilm growth in the presence of carbon dioxide and water flow in the subsurface
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DOI：
10.1016/j.advwatres.2010.04.004
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发表时间：
2010-07-01
影响因子：
4.7
通讯作者：
Gerlach, Robin
中科院分区：
文献类型：
--
作者：
Ebigbo, Anozie;Helmig, Rainer;Gerlach, Robin
温室气体----特别是二氧化碳（CO2）----在大气中的浓度在过去几十年中一直在上升。已提出的帮助减少人为CO2排放的方法之一是从大型固定点源捕获CO2并将其储存在深层地质构造中。盖层是一个不可渗透的地质层，防止储存的CO2泄漏，其完整性对储存安全至关重要。由于注入过程中的高压积聚，井附近的盖层特别有破裂的风险。生物膜可用作生物屏障，通过阻断泄漏通道，有助于防止CO2通过注入井附近的盖层泄漏。生物膜也可以保护油井水泥免受富CO2的britney. This本文的目的是开发和测试的数值模型，这是能够模拟的CO2储存水库中的生物膜的发展。这涉及生物膜的生长，在地质构造中的流动和运输，以及生物膜和流动过程之间的相互作用的描述。模型中考虑的重要过程包括生物膜生长对地层渗透性的影响、超临界CO2对悬浮和附着细菌的有害影响、生物质的附着和分离以及两相流体流动过程。通过将模拟结果与实验数据进行比较，对模型进行了检验。(C)2010爱思唯尔有限公司保留所有权利。
The concentration of greenhouse gases - particularly carbon dioxide (CO2) - in the atmosphere has been on the rise in the past decades. One of the methods which have been proposed to help reduce anthropogenic CO2 emissions is the capture of CO2 from large, stationary point sources and storage in deep geological formations. The caprock is an impermeable geological layer which prevents the leakage of stored CO2, and its integrity is of utmost importance for storage security. Due to the high pressure build-up during injection, the caprock in the vicinity of the well is particularly at risk of fracturing. Biofilms could be used as biobarriers which help prevent the leakage of CO2 through the caprock in injection well vicinity by blocking leakage pathways. The biofilm could also protect well cement from corrosion by CO2-rich brine.The goal of this paper is to develop and test a numerical model which is capable of simulating the development of a biofilm in a CO2 storage reservoir. This involves the description of the growth of the biofilm, flow and transport in the geological formation, and the interaction between the biofilm and the flow processes. Important processes which are accounted for in the model include the effect of biofilm growth on the permeability of the formation, the hazardous effect of supercritical CO2 on suspended and attached bacteria, attachment and detachment of biomass, and two-phase fluid flow processes. The model is tested by comparing simulation results to experimental data. (C) 2010 Elsevier Ltd. All rights reserved.