This work used mercury injection capillary pressure (MICP) analyses of the Tuscaloosa Group in Mississippi, including the Tuscaloosa marine shale (TMS), to assess their efficacy and sealing capacity for geologic carbon dioxide (CO₂) sequestration. Tuscaloosa Group porosity and permeability from MICP were evaluated to calculate CO₂ column height retention. TMS and Lower Tuscaloosa shale samples have, respectively, Swanson permeability values less than 0.003 md and 0.00245 md; porosity from 3.86% to 9.86% and 1.34% to 7.96%; median pore throat sizes from 0.00342 to 0.0111 μm and 0.00311 to 0.017 μm; and pore radii from 0.0130 to 0.152 μm and 0.0132 to 0.149 μm. Mercury entry pressures for the TMS and Lower Tuscaloosa range from 4.9 to 57.1 MPa and 5.0 to 56.3 MPa, respectively. Calculated CO₂ column heights that the TMS sample set can retain in the reservoir range from 23 to 255 m when the TMS is near 100% water saturation. Potential top seal leakage is more likely to be influenced by the numerous well penetrations through the confining system of the TMS rather than capillary failure. Results of this study demonstrate desirable sealing capacity of the TMS for geologic CO₂ sequestration in reservoir sandstones of the Lower Tuscaloosa and could provide an analogue to other potential CO₂ sequestration top seals.

这项工作使用了密西西比州塔斯卡卢萨集团（包括塔斯卡卢萨海洋页岩（TMS））的注汞毛细管压力（MICP）分析，以评估其封存地质二氧化碳（CO ₂）的功效和密封能力。评估了MICP的Tuscaloosa Group孔隙度和渗透率，以计算CO ₂色谱柱高度保留。TMS和塔斯卡卢萨下部页岩样品的Swanson渗透率值分别小于0.003 md和0.00245 md；孔隙率从3.86％到9.86％和1.34％到7.96％; 喉咙中值孔径从0.00342至0.0111μm和0.00311至0.017μm; 和孔半径为0.0130至0.152μm和0.0132至0.149μm。TMS和塔斯卡卢萨下部的汞进入压力分别为4.9至57.1 MPa和5.0至56.3 MPa。计算出的CO ₂当TMS接近100％的水饱和度时，TMS样品组可以保留在储层中的柱高范围为23至255 m。顶部密封件的潜在泄漏更可能受到通过TMS限制系统而不是毛细管故障的大量井穿透的影响。这项研究的结果表明，TMS对塔斯卡卢萨下层储层砂岩中地质CO ₂隔离的理想密封能力，可以为其他潜在的CO ₂隔离顶封提供类似物。