NDLI: Effect of injected CO$_{2}$ on geochemical alteration of the Altmark gas reservoir in Germany

Content Provider	Springer Nature Link
Author	Huq, F. Haderlein, S. B. Schröder, C. Marks, M. A. W. Grathwohl, P.
Copyright Year	2014
Abstract	Capturing CO$_{2}$ from point sources and storing it in geologic formations is a potential option for allaying the CO$_{2}$ level in the atmosphere. In order to evaluate the effect of geological storage of CO$_{2}$ on rock-water interaction, batch experiments were performed on sandstone samples taken from the Altmark reservoir, Germany, under in situ conditions of 125 °C and 50 bar CO$_{2}$ partial pressure. Two sets of experiments were performed on pulverized sample material placed inside a closed batch reactor in (a) CO$_{2}$ saturated and (b) CO$_{2}$ free environment for 5, 9 and 14 days. A 3M NaCl brine was used in both cases to mimic the reservoir formation water. For the “CO$_{2}$ free” environment, Ar was used as a pressure medium. The sandstone was mainly composed of quartz, feldspars, anhydrite, calcite, illite and chlorite minerals. Chemical analyses of the liquid phase suggested dissolution of both calcite and anhydrite in both cases. However, dissolution of calcite was more pronounced in the presence of CO$_{2}$. In addition, the presence of CO$_{2}$ enhanced dissolution of feldspar minerals. Solid phase analysis by X-ray diffraction and Mössbauer spectroscopy did not show any secondary mineral precipitation. Moreover, Mössbauer analysis did not show any evidence of significant changes in redox conditions. Calculations of total dissolved solids’ concentrations indicated that the extent of mineral dissolution was enhanced by a factor of approximately 1.5 during the injection of CO$_{2}$, which might improve the injectivity and storage capacity of the targeted reservoir. The experimental data provide a basis for numerical simulations to evaluate the effect of injected CO$_{2}$ on long-term geochemical alteration at reservoir scale.
Starting Page	3655
Ending Page	3662
Page Count	8
File Format	PDF
ISSN	18666280
Journal	Environmental Earth Sciences
Volume Number	72
Issue Number	9
e-ISSN	18666299
Language	English
Publisher	Springer Berlin Heidelberg
Publisher Date	2014-04-30
Publisher Place	Berlin, Heidelberg
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Batch experiments Sandstone CO$_{2}$ injection Mössbauer spectroscopy Mineral dissolution Geology Hydrology/Water Resources Geochemistry Environmental Science and Engineering Terrestrial Pollution Biogeosciences
Content Type	Text
Resource Type	Article
Subject	Global and Planetary Change Earth-Surface Processes Soil Science Environmental Chemistry Pollution Geology Water Science and Technology

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