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Abstract

Summary

The seals of the shallow gas occurrences in the northern offshore of the Netherlands are formed by siliciclastic intra-delta mudstones of Plio-Pleistocene age. There are no publicly available measured values of the seal capacity of these Plio-Pleistocene caprock mudstones. We developed, tested and applied a systematic approach to evaluate the permeability and capillary seal capacity of mudstones at shallow depth (400–900 m) using new grain size analysis data of offshore and onshore Cenozoic mudstones and publicly available pressure data. The calculations showed that the vertical permeability of the mudstones varies between 2.8E-20 and 1.1E-18 m2. Most of the pore throat radii of the mudstones vary between 0.5 and 1.5 μm. The gas column heights were also calculated for 10 offshore wells and all samples from these wells. The calculated capillary seal capacities of the mudstones vary between approximately 10 and 24 m. Overall, the systematic approach using grain size analysis data was found to be a promising methodology for estimating petrophysical properties (porosity, permeability, pore throat) and capillary seal capacities of Plio-Pleistocene mudstone caprocks.

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/content/papers/10.3997/2214-4609.20140028
2014-04-06
2024-04-23

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References

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http://instance.metastore.ingenta.com/content/papers/10.3997/2214-4609.20140028
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Capillary Seal Capacity of Cenozoic Mudstone Caprocks of Shallow Gas Occurrences, Dutch Offshore
Conference Proceedings 2014, 1 (2014); https://doi.org/10.3997/2214-4609.20140028
/content/papers/10.3997/2214-4609.20140028
/content/papers/10.3997/2214-4609.20140028
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