Pore system changes during experimental CO2 injection into detritic rocks: Studies of potential storage rocks from some sedimentary basins of Spain

Autor: Luis González-Menéndez, D. Breitner, Linda Luquot, Edgar Berrezueta
Přispěvatelé: Instituto Geológico y Minero de España (IGME), Institute of Environmental Assessment and Water Research (IDAEA), Consejo Superior de Investigaciones Científicas [Madrid] (CSIC)
Rok vydání: 2013
Předmět:
Scanning electron microscope
020209 energy
[SDU.STU]Sciences of the Universe [physics]/Earth Sciences
Mineralogy
02 engineering and technology
Management
Monitoring
Policy and Law
010502 geochemistry & geophysics
Feldspar
01 natural sciences
Industrial and Manufacturing Engineering
chemistry.chemical_compound
0202 electrical engineering
electronic engineering
information engineering
Porosity
ComputingMilieux_MISCELLANEOUS
0105 earth and related environmental sciences
geography
geography.geographical_feature_category
Sedimentary basin
Pollution
Supercritical fluid
Permeability (earth sciences)
General Energy
chemistry
[SDU]Sciences of the Universe [physics]
13. Climate action
visual_art
visual_art.visual_art_medium
Carbonate
Sedimentary rock
Geology
[SDU.STU.MI]Sciences of the Universe [physics]/Earth Sciences/Mineralogy
Zdroj: International Journal of Greenhouse Gas Control
International Journal of Greenhouse Gas Control, Elsevier, 2013, 17, pp.411-422. ⟨10.1016/j.ijggc.2013.05.023⟩
ISSN: 1750-5836
DOI: 10.1016/j.ijggc.2013.05.023
Popis: The effects of experimental injection of CO 2 into potential deep sedimentary formations are investigated, focusing on detrital rocks with interconnected pore networks. This approach consisted in the qualitative and quantitative determination of mineralogical and textural changes in selected sedimentary rock samples after injection of supercritical CO 2 ( P ≈ 75 bar, T ≈ 35 °C, 12–970 h exposure time and dry conditions). The mineralogy and texture were studied before and after the injection by optical and scanning electron microscopy, and quantification was done with digital image analysis. The studied rocks were sampled from different sedimentary basins in Spain and consist of feldspar sandstones with similar mineralogy but different textures (homogeneous vs. heterogeneous). The results obtained in the CO 2 -treated samples indicate a porosity increase (Δ n = 3.75%) and a qualitative permeability rise. Intergranular clay matrix detachment and partial removal from the rock sample (due to CO 2 input/release drag and electrical-polarity forces) are the main processes that explain the porosity increase. In contrast, carbonate cements were stable and no substantial changes were observed. Additional textural changes were minor and consisted on variations in the roughness of grain-pore contacts, pore shape and aspect ratio. Primary texture of the rock subjected to CO 2 injection is an important factor and seems to enhance textural/mineralogical changes in heterogeneous systems. These results simulate the CO 2 injection nearest to the injection well and indicate that, in this environment, where CO 2 push out the brine fluids and interacts with rocks in dry conditions, several mineralogy/texture re-adjustments take place. Consequences derived from these changes are variable. Possible porosity and permeability increases could facilitate further CO 2 injection but textural re-adjustment could also affect the rock physical properties.
Databáze: OpenAIRE
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