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Quantitative Analysis of Micro-structural Changes in a Bituminous Coal After Exposure to Supercritical CO2 and Water

  • Guanglei Zhang
  • P. G. RanjithEmail author
  • M. S. A. Perera
  • Yiyu Lu
  • Xavier Choi
Original Paper
  • 27 Downloads

Abstract

High-volatile bituminous coal samples were reacted in deionized water with supercritical CO2 (ScCO2–water) under simulated in situ pressure and temperature conditions (8 MPa and 40 °C) in unconfined stress state for 14 days, in order to characterize potential CO2–water–coal reactions. Micro-structural changes were identified pre- and post-experiment using X-ray powder diffraction (XRD) analysis for powdered coal (mineralogical changes), optical microscopy and scanning electron microscopy (SEM) for polished thin sections (surface feature changes) and micro-CT scanning for a small core (porosity and permeability changes). XRD analysis revealed that carbonic acid leaches out mineral matters in coal, including carbonates (calcite) and silicate minerals (albite, illite and kaolinite). Optical microscopy, SEM and CT images confirmed that the interaction of coal with ScCO2–water causes an abundance of micro-cracks to open or propagate in unconfined coal samples. Most micro-cracks preferably propagated along maceral–mineral and maceral–maceral interfaces, which demonstrates that the micro-cracking was caused by differential swelling of different coal lithotypes. Wormhole formation was observed in coal caused by mineral dissolution and hydrocarbon mobilization, which significantly increases coal porosity compared with swelling-induced cracking. 3-D pore network models extracted from CT images show that ScCO2–water treatment enlarges the pore and throat size, increases the numbers of pores and throats and improves pore network connectivity. Overall, CO2–water–coal interactions under unconfined conditions enhance coal porosity, connectivity and permeability, which can be attributed to the combined effect of micro-cracking, mineral dissolution and hydrocarbon mobilization.

Keywords

Supercritical CO2 Micro-CT Pore network model Connectivity 

Notes

Acknowledgments

The CT scanning was undertaken on the Imaging and Medical beamline at the Australian Synchrotron, and we record our great appreciation of Dr. Anton Maksimenko and Dr. Chris Hall for their assistance in recording the CT images.

References

  1. Anderson, S. T. (2017a). Cost implications of uncertainty in CO2 storage resource estimates: A review. Natural Resources Research, 26(2), 137–159.CrossRefGoogle Scholar
  2. Anderson, S. T. (2017b). Risk, liability, and economic issues with long-term CO2 storage—A review. Natural Resources Research, 26(1), 89–112.CrossRefGoogle Scholar
  3. Andrew, M., Bijeljic, B., & Blunt, M. J. (2013). Pore-scale imaging of geological carbon dioxide storage under in situ conditions. Geophysical Research Letters, 40(15), 3915–3918.CrossRefGoogle Scholar
  4. Anitescu, G., & Tavlarides, L. (2006). Supercritical extraction of contaminants from soils and sediments. The Journal of Supercritical Fluids, 38(2), 167–180.CrossRefGoogle Scholar
  5. Apps, J., Zheng, L., Zhang, Y., Xu, T., & Birkholzer, J. (2010). Evaluation of potential changes in groundwater quality in response to CO2 leakage from deep geologic storage. Transport in Porous Media, 82(1), 215–246.CrossRefGoogle Scholar
  6. Arena, A., Delle Piane, C., & Sarout, J. (2014). A new computational approach to cracks quantification from 2D image analysis: Application to micro-cracks description in rocks. Computers & Geosciences, 66, 106–120.CrossRefGoogle Scholar
  7. Blunt, M. J. (2001). Flow in porous media—Pore-network models and multiphase flow. Current Opinion in Colloid & Interface Science, 6(3), 197–207.CrossRefGoogle Scholar
  8. Brenner, D. (1983). In situ microscopic studies of the solvent-swelling of polished surfaces of coal. Fuel, 62(11), 1347–1350.  https://doi.org/10.1016/S0016-2361(83)80022-2.CrossRefGoogle Scholar
  9. Day, S., Fry, R., & Sakurovs, R. (2008). Swelling of Australian coals in supercritical CO2. International Journal of Coal Geology, 74(1), 41–52.CrossRefGoogle Scholar
  10. De Boever, E., Varloteaux, C., Nader, F. H., Foubert, A., Békri, S., Youssef, S., et al. (2012). Quantification and prediction of the 3D pore network evolution in carbonate reservoir rocks. Oil & Gas Science and Technology-Revue d’IFP Energies nouvelles, 67(1), 161–178.CrossRefGoogle Scholar
  11. Dong, H., Fjeldstad, S., Alberts, L., Roth, S., Bakke, S., & Øren, P.-E. (2008). Pore network modelling on carbonate: A comparative study of different micro-CT Network extraction methods. In International symposium of the society of core analysts, Society of Core Analysts, 2008.Google Scholar
  12. Dong, B., Meng, M., Qiu, Z., Lu, Z., Zhang, Y., & Zhong, H. (2019). Formation damage prevention using microemulsion in tight sandstone gas reservoir. Journal of Petroleum Science and Engineering, 173, 101–111.  https://doi.org/10.1016/j.petrol.2018.10.003.CrossRefGoogle Scholar
  13. Farquhar, S., Pearce, J., Dawson, G., Golab, A., Sommacal, S., Kirste, D., et al. (2015). A fresh approach to investigating CO2 storage: Experimental CO2–water–rock interactions in a low-salinity reservoir system. Chemical Geology, 399, 98–122.CrossRefGoogle Scholar
  14. Fujioka, M., Yamaguchi, S., & Nako, M. (2010). CO2-ECBM field tests in the Ishikari Coal Basin of Japan. International Journal of Coal Geology, 82(3), 287–298.  https://doi.org/10.1016/j.coal.2010.01.004.CrossRefGoogle Scholar
  15. Gathitu, B. B., Chen, W.-Y., & McClure, M. (2009). Effects of coal interaction with supercritical CO2: Physical structure. Industrial and Engineering Chemistry Research, 48(10), 5024–5034.CrossRefGoogle Scholar
  16. Ghafoori, M., Tabatabaei-Nejad, S. A., & Khodapanah, E. (2017). Modeling rock-fluid interactions due to CO2 injection into sandstone and carbonate aquifer considering salt precipitation and chemical reactions. Journal of Natural Gas Science and Engineering, 37, 523–538.CrossRefGoogle Scholar
  17. Grigg, R., & Svec, R. (2003). Co-injected CO2-brine interactions with Indiana Limestone. In SCA2003-19, presented at the Society of Core Analysts Convention SCA, 2003.Google Scholar
  18. Grigg, R. B., & Svec, R. (2008). Injectivity changes and CO2 retention for EOR and sequestration projects. In SPE symposium on improved oil recovery, 2008. Society of Petroleum Engineers.Google Scholar
  19. Gunter, W., Wiwehar, B., & Perkins, E. (1997). Aquifer disposal of CO2-rich greenhouse gases: Extension of the time scale of experiment for CO2-sequestering reactions by geochemical modelling. Mineralogy and Petrology, 59(1–2), 121–140.CrossRefGoogle Scholar
  20. He, X., & Luo, L.-S. (1997). Lattice Boltzmann model for the incompressible Navier–Stokes equation. Journal of Statistical Physics, 88(3), 927–944.CrossRefGoogle Scholar
  21. Hiscock, K. M. (2009). Hydrogeology: Principles and practice. Hoboken: Wiley.Google Scholar
  22. Hol, S., Spiers, C. J., & Peach, C. J. (2012). Microfracturing of coal due to interaction with CO2 under unconfined conditions. Fuel, 97, 569–584.CrossRefGoogle Scholar
  23. Izgec, O., Demiral, B., Bertin, H. J., & Akin, S. (2006). Experimental and numerical modeling of direct injection of CO2 into carbonate formations. In SPE annual technical conference and exhibition, 2006. Society of Petroleum Engineers.Google Scholar
  24. Jin, M., Ribeiro, A., Mackay, E., Guimarães, L., & Bagudu, U. (2016). Geochemical modelling of formation damage risk during CO2 injection in saline aquifers. Journal of Natural Gas Science and Engineering, 35, 703–719.CrossRefGoogle Scholar
  25. Karacan, C. Ö. (2007). Swelling-induced volumetric strains internal to a stressed coal associated with CO2 sorption. International Journal of Coal Geology, 72(3), 209–220.  https://doi.org/10.1016/j.coal.2007.01.003.CrossRefGoogle Scholar
  26. Karacan, C. Ö., & Mitchell, G. D. (2003). Behavior and effect of different coal microlithotypes during gas transport for carbon dioxide sequestration into coal seams. International Journal of Coal Geology, 53(4), 201–217.CrossRefGoogle Scholar
  27. Kolak, J. J., & Burruss, R. C. (2006). Geochemical investigation of the potential for mobilizing non-methane hydrocarbons during carbon dioxide storage in deep coal beds. Energy & Fuels, 20(2), 566–574.CrossRefGoogle Scholar
  28. Kolak, J. J., & Burruss, R. C. (2014). The use of solvent extractions and solubility theory to discern hydrocarbon associations in coal, with application to the coal–supercritical CO2 system. Organic Geochemistry, 73, 56–69.  https://doi.org/10.1016/j.orggeochem.2014.05.002.CrossRefGoogle Scholar
  29. Kutchko, B. G., Goodman, A. L., Rosenbaum, E., Natesakhawat, S., & Wagner, K. (2013). Characterization of coal before and after supercritical CO2 exposure via feature relocation using field-emission scanning electron microscopy. Fuel, 107, 777–786.CrossRefGoogle Scholar
  30. Larsen, J. W. (2004). The effects of dissolved CO2 on coal structure and properties. International Journal of Coal Geology, 57(1), 63–70.CrossRefGoogle Scholar
  31. Lebedev, M., Zhang, Y., Sarmadivaleh, M., Barifcani, A., Al-Khdheeawi, E., & Iglauer, S. (2017). Carbon geosequestration in limestone: Pore-scale dissolution and geomechanical weakening. International Journal of Greenhouse Gas Control, 66, 106–119.CrossRefGoogle Scholar
  32. Li, W., Liu, H., & Song, X. (2017). Influence of fluid exposure on surface chemistry and pore-fracture morphology of various rank coals: Implications for methane recovery and CO2 storage. Energy & Fuels, 31(11), 12552–12569.CrossRefGoogle Scholar
  33. Liu, S., Busch, A., Ma, J., Sang, S., Wang, T., Du, Y., et al. (2018). The effects of supercritical CO2 on mesopore and macropore structure in bituminous and anthracite coal. Fuel, 223, 32–43.CrossRefGoogle Scholar
  34. Massarotto, P., Golding, S. D., Bae, J. S., Iyer, R., & Rudolph, V. (2010). Changes in reservoir properties from injection of supercritical CO2 into coal seams—A laboratory study. International Journal of Coal Geology, 82(3), 269–279.  https://doi.org/10.1016/j.coal.2009.11.002.CrossRefGoogle Scholar
  35. Mathews, J. P., Campbell, Q. P., Xu, H., & Halleck, P. (2017). A review of the application of X-ray computed tomography to the study of coal. Fuel, 209, 10–24.CrossRefGoogle Scholar
  36. Mazumder, S., Van Hemert, P., Bruining, J., Wolf, K.-H., & Drabe, K. (2006). In situ CO2–coal reactions in view of carbon dioxide storage in deep unminable coal seams. Fuel, 85(12), 1904–1912.CrossRefGoogle Scholar
  37. Mazumder, S., & Wolf, K. H. (2008). Differential swelling and permeability change of coal in response to CO2 injection for ECBM. International Journal of Coal Geology, 74(2), 123–138.  https://doi.org/10.1016/j.coal.2007.11.001.CrossRefGoogle Scholar
  38. Meng, M., & Qiu, Z. (2018). Experiment study of mechanical properties and microstructures of bituminous coals influenced by supercritical carbon dioxide. Fuel, 219, 223–238.  https://doi.org/10.1016/j.fuel.2018.01.115.CrossRefGoogle Scholar
  39. Pan, Z., Connell, L. D., & Camilleri, M. (2010). Laboratory characterisation of coal reservoir permeability for primary and enhanced coalbed methane recovery. International Journal of Coal Geology, 82(3–4), 252–261.CrossRefGoogle Scholar
  40. Perera, M., Ranjith, P., Airey, D., & Choi, S.-K. (2011a). Sub-and super-critical carbon dioxide flow behavior in naturally fractured black coal: An experimental study. Fuel, 90(11), 3390–3397.CrossRefGoogle Scholar
  41. Perera, M. S. A., Ranjith, P. G., & Peter, M. (2011b). Effects of saturation medium and pressure on strength parameters of Latrobe Valley brown coal: Carbon dioxide, water and nitrogen saturations. Energy, 36(12), 6941–6947.  https://doi.org/10.1016/j.energy.2011.09.026.CrossRefGoogle Scholar
  42. Perera, M. S. A., Ranjith, P. G., & Viete, D. R. (2013). Effects of gaseous and super-critical carbon dioxide saturation on the mechanical properties of bituminous coal from the Southern Sydney Basin. Applied Energy, 110, 73–81.  https://doi.org/10.1016/j.apenergy.2013.03.069.CrossRefGoogle Scholar
  43. Pirzada, M. A., Zoorabadi, M., Ramandi, H. L., Canbulat, I., & Roshan, H. (2018). CO2 sorption induced damage in coals in unconfined and confined stress states: A micrometer to core scale investigation. International Journal of Coal Geology, 198, 167–176.CrossRefGoogle Scholar
  44. Radke, M., Willsch, H., & Teichmüller, M. (1990). Generation and distribution of aromatic hydrocarbons in coals of low rank. Organic Geochemistry, 15(6), 539–563.  https://doi.org/10.1016/0146-6380(90)90101-5.CrossRefGoogle Scholar
  45. Ranathunga, A. S., Perera, M. S. A., & Ranjith, P. G. (2016a). Influence of CO2 adsorption on the strength and elastic modulus of low rank Australian coal under confining pressure. International Journal of Coal Geology, 167, 148–156.  https://doi.org/10.1016/j.coal.2016.08.027.CrossRefGoogle Scholar
  46. Ranathunga, A. S., Perera, M. S. A., Ranjith, P. G., & Bui, H. (2016b). Super-critical CO2 saturation-induced mechanical property alterations in low rank coal: An experimental study. The Journal of Supercritical Fluids, 109, 134–140.  https://doi.org/10.1016/j.supflu.2015.11.010.CrossRefGoogle Scholar
  47. Reucroft, P., & Sethuraman, A. (1987). Effect of pressure on carbon dioxide induced coal swelling. Energy & Fuels, 1(1), 72–75.CrossRefGoogle Scholar
  48. Romanov, V. (2007). Coal chemistry for mechanical engineers: From macromolecular thermodynamics to reservoir simulation. Energy & Fuels, 21(3), 1646–1654.CrossRefGoogle Scholar
  49. Shan, X., & Chen, H. (1993). Lattice Boltzmann model for simulating flows with multiple phases and components. Physical Review E, 47(3), 1815.CrossRefGoogle Scholar
  50. Taylor, H. F., O’Sullivan, C., & Sim, W. W. (2015). A new method to identify void constrictions in micro-CT images of sand. Computers and Geotechnics, 69(Supplement C), 279–290.  https://doi.org/10.1016/j.compgeo.2015.05.012.CrossRefGoogle Scholar
  51. Viete, D. R., & Ranjith, P. G. (2006). The effect of CO2 on the geomechanical and permeability behaviour of brown coal: Implications for coal seam CO2 sequestration. International Journal of Coal Geology, 66(3), 204–216.  https://doi.org/10.1016/j.coal.2005.09.002.CrossRefGoogle Scholar
  52. Wang, K., Xu, T., Wang, F., & Tian, H. (2016). Experimental study of CO2–brine–rock interaction during CO2 sequestration in deep coal seams. International Journal of Coal Geology, 154, 265–274.CrossRefGoogle Scholar
  53. White, C. M., Smith, D. H., Jones, K. L., Goodman, A. L., Jikich, S. A., LaCount, R. B., et al. (2005). Sequestration of carbon dioxide in coal with enhanced coalbed methane recovery: A review. Energy & Fuels, 19(3), 659–724.CrossRefGoogle Scholar
  54. Wigand, M., Carey, J., Schütt, H., Spangenberg, E., & Erzinger, J. (2008). Geochemical effects of CO2 sequestration in sandstones under simulated in situ conditions of deep saline aquifers. Applied Geochemistry, 23(9), 2735–2745.CrossRefGoogle Scholar
  55. Yang, J., Lian, H., Liang, W., Nguyen, V. P., & Chen, Y. (2018). Experimental investigation of the effects of supercritical carbon dioxide on fracture toughness of bituminous coals. International Journal of Rock Mechanics and Mining Sciences, 107, 233–242.  https://doi.org/10.1016/j.ijrmms.2018.04.033.CrossRefGoogle Scholar
  56. Yu, Z., Liu, L., Yang, S., Li, S., & Yang, Y. (2012). An experimental study of CO2–brine–rock interaction at in situ pressure–temperature reservoir conditions. Chemical Geology, 326–327, 88–101.  https://doi.org/10.1016/j.chemgeo.2012.07.030.CrossRefGoogle Scholar
  57. Zhang, K., Cheng, Y., Jin, K., Guo, H., Liu, Q., Dong, J., et al. (2017). Effects of supercritical CO2 fluids on pore morphology of coal: Implications for CO2 geological sequestration. Energy & Fuels, 31(5), 4731–4741.CrossRefGoogle Scholar
  58. Zhang, D., Gu, L., Li, S., Lian, P., & Tao, J. (2013). Interactions of supercritical CO2 with coal. Energy & Fuels, 27(1), 387–393.CrossRefGoogle Scholar
  59. Zhang, Y., Lebedev, M., Al-Yaseri, A., Yu, H., Nwidee, L. N., Sarmadivaleh, M., et al. (2018a). Morphological evaluation of heterogeneous oolitic limestone under pressure and fluid flow using X-ray microtomography. Journal of Applied Geophysics, 150, 172–181.CrossRefGoogle Scholar
  60. Zhang, Y., Lebedev, M., Sarmadivaleh, M., Barifcani, A., & Iglauer, S. (2016a). Swelling-induced changes in coal microstructure due to supercritical CO2 injection. Geophysical Research Letters, 43(17), 9077–9083.CrossRefGoogle Scholar
  61. Zhang, Y., Lebedev, M., Sarmadivaleh, M., Barifcani, A., Rahman, T., & Iglauer, S. (2016b). Swelling effect on coal micro structure and associated permeability reduction. Fuel, 182, 568–576.CrossRefGoogle Scholar
  62. Zhang, G., Ranjith, P., Perera, M., Haque, A., Choi, X., & Sampath, K. (2018b). Characterization of coal porosity and permeability evolution by demineralisation using image processing techniques: A micro-computed tomography study. Journal of Natural Gas Science and Engineering, 56, 384–396.CrossRefGoogle Scholar
  63. Zhang, X. G., Ranjith, P. G., Ranathunga, A. S., & Li, D. Y. (2019). Variation of mechanical properties of bituminous coal under CO2 and H2O saturation. Journal of Natural Gas Science and Engineering, 61, 158–168.  https://doi.org/10.1016/j.jngse.2018.11.010.CrossRefGoogle Scholar
  64. Zhang, Y., Xu, X., Lebedev, M., Sarmadivaleh, M., Barifcani, A., & Iglauer, S. (2016c). Multi-scale X-ray computed tomography analysis of coal microstructure and permeability changes as a function of effective stress. International Journal of Coal Geology, 165, 149–156.CrossRefGoogle Scholar
  65. Zhou, S., Liu, D., Cai, Y., Yao, Y., & Li, Z. (2017). 3D characterization and quantitative evaluation of pore-fracture networks of two Chinese coals using FIB-SEM tomography. International Journal of Coal Geology, 174, 41–54.CrossRefGoogle Scholar

Copyright information

© International Association for Mathematical Geosciences 2019

Authors and Affiliations

  1. 1.Deep Earth Energy Laboratory, Department of Civil EngineeringMonash UniversityMelbourneAustralia
  2. 2.Department of Infrastructure EngineeringThe University of MelbourneMelbourneAustralia
  3. 3.State Key Laboratory of Coal Mine Disaster Dynamics and ControlChongqing UniversityChongqingChina

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