PREDICTION OF MIGRATION OF CO2 INJECTED INTO AN UNDERGROUND DEPOSITORY: RESERVOIR GEOLOGY AND MIGRATION MODELLING IN THE SLEIPNER CASE (NORTH SEA)
PREDICTION OF MIGRATION OF CO2 INJECTED INTO AN UNDERGROUND DEPOSITORY: RESERVOIR GEOLOGY AND MIGRATION MODELLING IN THE SLEIPNER CASE (NORTH SEA)
复制标题
注入地下矿床的二氧化碳迁移预测：斯莱普纳案例（北海）的储层地质和迁移建模
DOI：
--
复制
发表时间：
2000
期刊：
影响因子：
--
通讯作者：
Ø. Sylta
中科院分区：
文献类型：
--
作者：
P. Zweigel;M. Hamborg;R. Arts;A. Lothe;Ø. Sylta
预测注入Sleipner地区（北海）的CO2的分布是国际研究项目SACS的一个主要课题。我们在这里报告一个详细的地质解释的存款（中-上新世乌齐拉砂），地震，电缆测井和样品数据的基础上的摘要。我们预计，CO2最终将迁移到由上新世页岩单元底部形成的乌齐拉砂顶部，或迁移到上新世页岩底部上方的向东增厚的砂楔中。因此，由于CO2迁移主要是浮力驱动的，我们认为这两个备选储层顶部的地形对于中期迁移模式至关重要。这两个障碍表面以3D地震分辨率绘制，并用于各种表示（不同的解释器，时间域，深度域等）。作为使用次级迁移模拟器SEMI的迁移模拟的输入。预计在乌齐拉沙地顶部以下的迁移将以西北方向进行，可能不会超过约1000万年。12 km，总注入量为20 Mil。吨二氧化碳。顶部砂楔下方的迁移将沿东北方向进行，当计划注入量的25%被捕获时，CO2将离开研究区域。我们的模拟结果突出了微妙的地形差异的重要性（0.3o的差异，在两个障碍层之间的区域倾角）的迁移模式。大迁移距离和（浅）含水层储存地点所需的高地形分辨率要求标准模拟工具尚不具备的建模能力。
Prediction of the distribution of CO2 injected in the Sleipner area (North Sea) is a major topic of the international research project SACS. We report here a summary of detailed geological interpretations of the depository (the Mio-Pliocene Utsira Sands), based on seismic, wireline-log and sample data. We expect that CO2 will ultimately migrate to the top of the Utsira Sands which is formed by the base of a Pliocene shale unit, or into an eastward thickening sand wedge closely above the base of the Pliocene shales. Therefore, and since CO2 migration is primarily buoyancy driven, we consider the topography of the tops of these two alternative reservoirs to be of utmost importance for the medium-term migration pattern. The two barrier surfaces were mapped at 3D seismic resolution and were used in various representations (different interpreters, time domain, depth domain etc.) as input for migration simulations employing the secondary migration simulator SEMI. Migration below the top Utsira Sands is predicted to take place in a north-westward direction and will probably be not more than ca. 12 km for a total injected quantity of 20 Mill. metric tons CO2. Migration below the top sand wedge will take place in a north-eastward direction with the consequence that CO2 will leave the studied area when up to 25% of the planned injection volume will have been trapped. Our simulation results highlight the importance of subtle topography differences (0.3o difference in regional dip between the two barrier horizons) on the migration pattern. The large migration distances and the necessary high topography resolution for storage sites in (shallow) aquifers demand modelling capacities not yet available with standard simulation tools.