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Volume 28, Issue 3
  • ISSN: 1354-0793
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Abstract

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 CO and CH, with uncertainty ranges. Predicted CO column heights are slightly less than the equivalent CH column heights. The observed CH 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 CO 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

© 2022 The Author(s). Published by The Geological Society of London for GSL and EAGE. All rights reserved
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2022-06-27
2024-04-20

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Comparison of shale depth functions in contrasting offshore basins and sealing behaviour for CH4 and CO2 containment systems
Petroleum Geoscience 28, petgeo2021-101 (2022); https://doi.org/10.1144/petgeo2021-101
/content/journals/10.1144/petgeo2021-101
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