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Experimental study of CO2–brine–rock interaction during CO2 sequestration in deep coal seams

Published on Jan 1, 2016in International Journal of Coal Geology5.33
· DOI :10.1016/j.coal.2016.01.010
Kairan Wang5
Estimated H-index: 5
(JLU: Jilin University),
Tianfu Xu31
Estimated H-index: 31
(JLU: Jilin University)
+ 1 AuthorsHailong Tian10
Estimated H-index: 10
(JLU: Jilin University)
Abstract
Abstract CO 2 sequestration in deep coal seams is a potential option for reducing greenhouse gas emissions. Once CO 2 is injected into coal seams, sealing capability of the cap rock is critical. To investigate and quantify reactions over time between CO 2 , cap rocks and brine, associated with selected cap rocks of the No. 3 coalbed of the Qinshui Basin in China, batch experiments were conducted for reacting powdered rock samples (180–220 μm) with CO 2 and brine, as well as CO 2 -free brine, at 160 °C and 15 MPa. The analysis of leachate chemistry indicated significant mobilization of major elements from dissolution of carbonate and silicate minerals in the coal measure strata. Analysis of reacted solids by XRD and SEM also revealed appreciable changes in mineralogical compositions. For lithic sandstone after reaction with CO 2 –brine, the contents of quartz, plagioclase, illite and chlorite increased considerably, whereas the contents of illite/smectite, biotite and kaolinite decreased more or less. The calcareous mudstone reacting with CO 2 –brine and CO 2 -free brine all showed major mineralogical alteration after 12 days of treatment. The modeling results identified key chemical processes, but they also showed that the models are not capable of covering all possible contingencies. The precipitation of carbonate minerals could also enhance the security of CO 2 sequestration in deep coal seams.
  • References (57)
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References57
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#1Hailong Tian (JLU: Jilin University)H-Index: 10
#2Tianfu Xu (JLU: Jilin University)H-Index: 31
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In CO2 geological storage (CGS) context, the evolution of the caprock sealing capacity has received increasing attention, particularly on a geological time span (thousands of years). At this time scale, geochemical reactions may enhance or weaken the caprock quality. It is widely recognized that, for the reservoir, geological heterogeneities affect the concentration and spatial distribution of CO2, and then affect the extent of gas–water–rock interactions, which in turn alters the hydrogeologica...
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#2Dameng Liu (China University of Geosciences)H-Index: 30
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Abstract The effect of mineral matter on the fracture evolution was investigated for Lower Permian and Upper Pennsylvanian coal samples from the Qinshui Basin of China. Optical microscopy, scanning electron microscopy with energy dispersive X-ray spectrometry (SEM–EDS), and X-ray computed tomography (X-ray CT) were used to investigate the composition and modes of occurrence of minerals within the coals and to characterize the natural and induced fractures present within the samples. The spatial ...
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