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首页> 外文会议>International Conference on Greenhouse Gas Control Technologies >COMPARISON OF LONG-TERM GEOCHEMICAL INTERACTIONS AT TWO NATURAL CO2-ANALOGUES: MONTMIRAL (SOUTHEAST BASIN, FRANCE) AND MESSOKAMPOS (FLORINA BASIN, GREECE) CASE STUDIES
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COMPARISON OF LONG-TERM GEOCHEMICAL INTERACTIONS AT TWO NATURAL CO2-ANALOGUES: MONTMIRAL (SOUTHEAST BASIN, FRANCE) AND MESSOKAMPOS (FLORINA BASIN, GREECE) CASE STUDIES

机译：两种天然二氧化碳 - 类似物的长期地球化学相互作用的比较：蒙疹（东南盆地，法国）和Messokampos（弗洛琳娜盆地，希腊）案例研究

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The study of analogous natural CO_2-rich reservoirs is crucial for the assessment of the long-term geochemical impacts of CO_2 storage. Here, the impact of long-term CO_2 accumulations in two sandy reservoirs of different origin is assessed: the high-temperature and high-pressure reservoir at great depth at Montmiral (Southeast Basin, France, 100°C, 36 MPa) and the shallow, low-temperature and low-pressure reservoir at Messokampos (Fiorina Basin, Greece, 25°C, 0.5 MPa). Petrographic characterization of the reservoirs enabled the identification of both the effects of CO_2-induced geochemical interactions as well as their impact on reservoir lithologies. Subsequently, geochemical modelling (using PHREEQC) was applied to reproduce the observed effects, identify their driving parameters and to assess their impact in terms of potential mineral trapping and porosity changes. At Montmiral, supercritical CO_2 accumulated below 2400 m in Triassic sandstones and early Jurassic limestones. CO_2 migration into the reservoir caused the dissolution of feldspars and carbonates and resulted in minor precipitation of clay minerals (illite and/or kaolinite). Geochemical modelling indicates that the porosity increase attributed to this reactivity requires that the sediment is flushed intensively with CO_2-rich pore waters (open system) and that a flow regime in the reservoir must have been in place at a certain point in the reservoir's geological history. At Messokampos, high levels of CO_2 dissolved in groundwater occur close to the surface (below 300 m) in Tertiary sands alternating with silt and clay layers. Potential reactions involving CO_2 include siderite dissolution, the precipitation of iron oxides and gibbsite, triggered by the dissolution of feldspars. The impact of these reactions is minor and does not seem to influence the porosity of the sediment. Although the system has been in place for a long time, thermodynamic equilibrium conditions seem not to be established. Comparison of the geochemical interactions at the two sites shows that a reservoir's temperature and pressure conditions determine the impact of CO_2 interactions, with elevated temperatures significantly increasing the reaction rates of mineral-trapping reactions. This is of great importance for the selection of future CO_2-storage sites. In the case of Messokampos mineral trapping does not occur. Also in the Montmiral case, when representing it as a closed system, mineral trapping seems insignificant. However, the presence of a flow regime enhances mineral trapping and a mineral-trapping capacity of 8.1 kg CO_2 per m~3 of reservoir rock is modelled.
机译：类似的自然丰富CO_2-水库的研究是CO_2存储的长期地球化学影响的评估是至关重要的。在此，长期CO_2积累的在不同来源的2个砂质储层的影响进行评估：在大深度的高温和高压储存在蒙特米拉（东南盆地，法国，100℃，36兆帕）和浅低温和低压储存在Messokampos（菲奥莉娜盆地，希腊，25℃，0.5兆帕）。储层岩相特征启用的CO_2引起的地球化学相互作用以及它们对储层岩性的影响既影响了鉴定。随后，地球化学模拟（使用PHREEQC）施加到再现所观察到的效果，确定其参数驱动，并评估它们在潜在的矿物俘获和孔隙率方面的变化的影响。在蒙特米拉，超临界CO_2在三叠纪砂岩和早期侏罗纪灰岩积累下面2400米。 CO_2迁移到贮存引起长石和碳酸盐的溶解并且导致粘土矿物的微小沉淀（伊利石和/或高岭石）。地球化学模拟表明归属于该反应的孔隙度增加需要沉积物与富CO_2孔隙水（开放系统）集中冲洗和贮存器中的流动状态一定是到位在水库的地质历史上某一点。在Messokampos，溶解在地下水高水平CO_2接近发生在第三砂交替的淤泥和粘土层的表面（低于300米）。涉及CO_2潜在反应包括菱铁矿溶解，氧化铁和三水铝石的沉淀，由长石的溶解触发。这些反应的影响是轻微的，似乎并不影响沉积物孔隙率。尽管该系统已实行了很长一段时间，热力学平衡条件似乎并不成立。在两个站点示出了地球化学相互作用的比较，一个储存器的温度和压力条件确定CO_2相互作用的影响，升高的温度显著增加矿物质的捕集反应的反应速率。这是对未来的CO_2存储地点的选择非常重要。在Messokampos矿物俘获的情况下不会发生。另外，在蒙特米拉情况下，代表它作为一个封闭的系统时，矿物捕集显得微不足道。然而，流态的存在增强矿物捕获和储存器的岩石被建模的8.1公斤CO_2每米〜3矿物捕集容量。

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