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Abstract

Summary

Depleted hydrocarbon (oil and gas) reservoirs in Poland are regarded for underground storage of carbon dioxide. The deposits potentially usable for CO2 sequestration ale located within Permian sandstones and partially carbonate rocks.

The purpose of the paper is to present some aspects of CO2 – rock interaction, on the example of Permian sedimentary rocks occurring in the Polish Basin, regarding possible acid gas storage.

The composed samples of rock and wellbore cement were exposed to CO2-saturated brine, in the autoclave reactor, under the formation conditions. The samples were analyzed before and after reactor experiments to report mineralogical and textural changes. The most significant alteration appears after the third stage of the experiment, with duration of 200 days. The observed changes are differentiated and dependent on the lithology. In case of carbonate rocks (limestone and dolomite) the changes are limited to the local dissolution of CaCO3, and secondary precipitation of this phase. In case of anhydrite and sandstone the significant increase of porosity in outer zone of the samples was noted. In a process of CO2 sequestration the pores and fissures formed in rocks can be a potential migration path for gases, especially on the rock-cement interface.

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/content/papers/10.3997/2214-4609.201413369
2015-06-01
2024-04-24

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References

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CO2-rock Interaction on the Example of Permian Sedimentary Rocks
Conference Proceedings 2015, 1 (2015); https://doi.org/10.3997/2214-4609.201413369
/content/papers/10.3997/2214-4609.201413369
/content/papers/10.3997/2214-4609.201413369
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