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Interakcja skała–solanka–CO2

Cicha-Szot Renata, Leśniak Grzegorz

Przegląd Geologiczny

2023

Vol. 71, nr 4

164--168

The rock–brine–CO2 interaction significantly affects the mechanism and efficiency of the geological storage process. Therefore, learning and understanding the processes occurring in the pore space is extremely important to ensure the safe large-scale storage of this gas. A measurement procedure was developed to assess changes in petrophysical parameters under the influence of CO2. A specialized test stand was designed and built to simulate rock–brine–CO2 interaction under simulated reservoir conditions. The research was carried out on samples of carbonate rocks and Cambrian sandstones. In most cases, an improvement of filtration parameters in the 5–20% range was observed. In the case of samples in which the dominant mineral was calcite, the increase in filtration parameter values reached 200–400%. An increase in the diameter of the pore channels and a change in the surface roughness, as well as greater hydraulic connectivity of the pore space, will affect the capillary forces and the loss of continuity of the non-wetting fluid flow, limiting capillary trapping in the near-wellbore zone.

Rezultaty badań eksperymentalnych i modelowania hydrogeochemicznego efektów interakcji między gazami kwaśnymi (CO2 i H2S) a środowiskiem geologicznym wybranych skał GZW

Labus K., Suchodolska K.

Przegląd Geologiczny

2015

Vol. 63, nr 10/2

887--892

Abatement of greenhouse effect, enhanced oil and gas recovery, and energized fluid fracturing technologies require thorough studies on acid gas impact on geologic formations. This contribution based on laboratory experiments coupled with hydrogeochemical models, considering the impact of CO2 and H2S and their mixtures on rocks representative for the Upper Silesian Coal Basin (USCB). In our study, by means of SEM and EDX analyses, we identified significant changes in structure and composition of rock samples influenced by acid gas in autoclave experiments. Dissolution of skeletal grains was the most distinct in carbonates and chlorite, and led to porosity increase. Experimental results were used in modeling, which allowed for geochemical reactions identification, assessment of the volume of secondary minerals, and amounts of gases sequestered in 10 000 years of simulated storage. The maximum calculated mineral-trapping capacity, for the mudstone of the USCB paralic series, reached 28.2 kg CO2/m3 for CO2 injection. The Dębowiec Formation rocks were characterized by high capacity for H2S sequestration amounting to 15.5 kg H2S/m3. Results of modeling demonstrated, that in the case of geological storage of H2S, a release of significant amounts of CO2, from dissolution of primary carbonates, should be expected.