Mudrock compaction trends from the Rovuma Basin offshore Mozambique are compared with those of the Norwegian North Sea, the Gulf of Mexico and the Kutai Basin offshore Indonesia. The comparison reveals that burial rates and timing of rifting are the dominant causes for the differences observed. The compaction trend for the Rovuma Basin is broadly similar to the trends for the Kutai Basin and the Gulf of Mexico, but very different from those for the Norwegian North Sea data, which show higher porosity and shallower onset of overpressure than those from the other three basins. The relationships for seismic velocities as a function of depth show strong similarities between the Rovuma and Gulf of Mexico basins.

These comparisons are used to make a general assessment of the capillary sealing potential of Cretaceous mudrocks in the Rovuma Basin, using a mudstone permeability-prediction function and a method for mapping permeability to threshold pressure, allowing estimation of maximum column heights for CO₂ and CH₄, with uncertainty ranges. Predicted CO₂ column heights are slightly less than the equivalent CH₄ column heights. The observed CH₄ column height at one of the wells is significantly lower than that predicted from mudstone permeability, which is probably due to other factors such as fracturing or gas migration out of the structure. The comparison indicates generally good capillary sealing potential for the Rovuma Basin Cretaceous shales and offers a general approach for assessing CO₂ storage potential from hydrocarbon sealing datasets from multiple offshore basins.

This article is part of the Energy Geoscience Series available at https://www.lyellcollection.org/cc/energy-geoscience-series

将莫桑比克近海鲁伍马盆地的泥岩压实趋势与挪威北海、墨西哥湾和印度尼西亚近海库泰盆地的泥岩压实趋势进行了比较。比较表明，埋藏率和裂谷时间是观察到差异的主要原因。鲁伍马盆地的压实趋势与库泰盆地和墨西哥湾的趋势大致相似，但与挪威北海数据的压实趋势非常不同，后者显示出比其他三个更高的孔隙度和更浅的超压开始盆地。地震速度与深度的关系表明鲁伍马和墨西哥湾盆地之间有很强的相似性。

这些比较用于对鲁伍马盆地白垩系泥岩的毛细管封闭潜力进行一般评估，使用泥岩渗透率预测函数和将渗透率映射到阈值压力的方法，允许估计 CO ₂和 CH的最大柱高度₄，具有不确定性范围。预测的 CO ₂柱高略低于等效的 CH ₄柱高。观察到的 CH ₄其中一口井的柱高明显低于泥岩渗透率预测的值，这可能是由于其他因素，例如压裂或气体运出构造。该比较表明，鲁伍马盆地白垩系页岩具有良好的毛细管封闭潜力，并为从多个近海盆地的碳氢化合物封闭数据集中评估 CO _{2储存潜力提供了一种通用方法。}

本文是能源地球科学系列的一部分，可在 https://www.lyellcollection.org/cc/energy-geoscience-series