ABSTRACT A 3D geological model of the Torre‐Bembibre Carboniferous sub‐basin, a potential CO2 storage reservoir, is proposed here. The Torre‐Bembibre sub‐basin is part of the El Bierzo coal‐bearing Carboniferous basin located in the westernmost part of Leon province (NW Spain). It covers an area of about 150 km2. Carboniferous deposits (up to 1500 m of continental siliciclastics) are divided into nine intervals, defined by earlier coal exploration work. They were deposited as intramontane basin infill within a transpressional regime during the last stages of the Variscan Orogeny and are partially covered by Neogene and Quaternary continental siliciclastic sediments, formed by alluvial plains, fans and terraces. To resolve a 3D geological model of the Torre‐Bembibre sub‐basin, including outcropping layers and their prolongation at depth, a 3D dip‐domain method was applied, where data from all stratigraphic positions were used to compose a coherent geological reconstruction of the stratigraphic surfaces. Subsurface information was available from previous and newly acquired seismic reflection profiles and boreholes. The 3D model helped resolving some uncertainties, specifically: (i) the western termination of the Carboniferous basin under the Tertiary sediments, corresponding to an NNE–SSW normal fault, (ii) the depth and morphology of the base of the Carboniferous strata and (iii) the morphology of the intra‐Carboniferous layers. The syncline/anticline shape of the Torre‐Bembibre sub‐basin suggests a reservoir which may be capable of storing CO2 under the Tertiary cover. The total estimated volume is 6.4 km3, while the total capacity for CO2 storage could be as much as 7 Mt. The reservoir is most likely located within the major massive sandstone bodies in the Chuchu interval, in the syncline–anticline structure north of the town of Bembibre. The potential capacity of the reservoir calls for undertaking further studies using the proposed 3D geological model in order to determine more precisely the petrophysics and geometry near Bembibre.

中文翻译：

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El Bierzo 盆地（石炭纪，西班牙西北部）潜在 CO 2 储层的 3D 地质模型

摘要 这里提出了一个潜在的 CO2 储存库 Torre-Bembibre 石炭纪子盆地的 3D 地质模型。Torre-Bembibre 子盆地是位于莱昂省（西班牙西北部）最西部的 El Bierzo 含煤石炭纪盆地的一部分。占地面积约150平方公里。石炭纪矿床（高达 1500 米的大陆硅碎屑）被划分为九个区间，这些区间由早期的煤炭勘探工作定义。在瓦利斯坎造山运动的最后阶段，它们作为山内盆地填充物沉积在一个挤压机制内，部分被新第三纪和第四纪大陆硅质碎屑沉积物覆盖，由冲积平原、扇和阶地形成。为了解析 Torre-Bembibre 子盆地的 3D 地质模型，包括露头层及其深度延伸，应用了 3D 倾角域方法，其中使用来自所有地层位置的数据来组成地层表面的连贯地质重建。地下信息可从以前和新获得的地震反射剖面和钻孔中获得。3D 模型帮助解决了一些不确定性，特别是：（i）第三纪沉积物下石炭纪盆地的西端，对应于 NNE-SSW 正断层，（ii）石炭纪地层底部的深度和形态以及（ iii) 石炭纪内层的形态。Torre-Bembibre 次盆地的向斜/背斜形状表明在第三纪盖层下可能存在一个能够储存 CO2 的储层。估计总体积为 6.4 平方公里，而二氧化碳储存的总容量可能高达 7 公吨。该储层最有可能位于楚楚区间的主要块状砂岩体内，位于本比布雷镇以北的向斜-背斜构造中。储层的潜在容量需要使用提议的 3D 地质模型进行进一步研究，以便更精确地确定 Bembibre 附近的岩石物理和几何形状。