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Geomechanical properties of synthesised clayey rocks in process of high-pressure compression and consolidation

  • Liu, Taogen (School of Civil Engineering and Architectural Engineering, Nanchang Institute of Technology) ;
  • Li, Ling (School of Civil Engineering and Architectural Engineering, Nanchang Institute of Technology) ;
  • Liu, Zaobao (Key Laboratory of Ministry of Education on Safe Mining of Deep Metal Mines, College of Resources and Civil Engineering, Northeastern University) ;
  • Xie, Shouyi (Key Laboratory of Ministry of Education on Safe Mining of Deep Metal Mines, College of Resources and Civil Engineering, Northeastern University) ;
  • Shao, Jianfu (Key Laboratory of Ministry of Education on Safe Mining of Deep Metal Mines, College of Resources and Civil Engineering, Northeastern University)
  • Received : 2018.09.11
  • Accepted : 2020.02.20
  • Published : 2020.03.25

Abstract

Oil and natural gas reserves have been recognised abundantly in clayey rich rock formations in deep costal reservoirs. It is necessary to understand the sedimentary history of those reservoir rocks to well explore these natural resources. This work designs a group of laboratory experiments to mimic the physical process of the sedimentary clay-rich rock formation. It presents characterisation results of the physical properties of the artificial clayey rocks synthesized from illite clay, quartz sand and brine water by high-pressure consolidation tests. Special focus is given on the effects of illite clay content and high-stress consolidation on the physical properties. Multi-step loaded consolidation experiments were carried out with stress up to 35 MPa on mixtures constituting of the illite clay, quartz sand and brine water with five initial illite clay contents (w=85%, 70%, 55%, 40% and 25%). Compressibility and void ratio were characterised throughout the physical compaction process of the mixtures constituting of five illite clay contents and their water permeability was measured as well. Results show that the applied stress induces a great reduction of clayey rock void ratio. Illite clay contents has a significant influence on the compressibility, void ratio and the permeability of the physically synthesized clayey rocks. There is a critical illite clay content w=70% that induces the minimum void ratio in the physically synthesised clayey rocks. The SEM study indicates, in the high-pressure synthesised clayey rocks with high illite clay contents, the illite clay minerals are located in layers and serve as the material matrix, and the quartz minerals fill in the inter-mineral pores or are embedded in the illite clay matrix. The arrangements of the minerals in microscale originate the structural anisotropy of the high-pressure synthesised clayey rock. The test findings can give an intuitive physical understanding of the deep-buried clayey rock basins in energy reservoirs.

Keywords

Acknowledgement

Supported by : Department of Education of Jiangxi Province, Central Universities of China

This work was supported in part by Total Company, in part by the Science and Technology Research Project of the Department of Education of Jiangxi Province (No. GJJ190979), in part by the Fundamental Research Funds for Central Universities of China (N180105031), the Young Talent Program of Liaoning Province (XLYC1807094), the Research and Development Program of Anhui Province (no.1804b06020361) and Sichuan Province (no.2019YFG0047), in part by the 111 Project (B17009), and in part by the Sino-Franco Joint Research Laboratory on Multiphysics and Multiscale Rock Mechanics. The authors thank Mr. Jean Secq for technical supports in preparation and development of the testing devices.

References

  1. Abichou, T., Benson, H.B. and Edil, T.B. (2002), "Micro-structure and hydraulic conductivity of simulated sand-bentonite mixture", Clay. Clay Miner., 50(5), 537-545. https://doi.org/10.1346/000986002320679422.
  2. Akgun, H., Ada, M. and Kockar, M.K. (2015), "Performance assessment of a bentonite-sand mixture for nuclear waste isolation at the potential Akkuyu Nuclear Waste Disposal Site, southern Turkey", Environ. Earth Sci., 73(10), 6101-6116. https://doi.org/10.1007/s12665-014-3837-x.
  3. Armand, G., Conil, N., Talandier, J. and Seyedi, D.M. (2017b), "Fundamental aspects of the hydromechanical behaviour of Callovo-Oxfordian claystone: From experimental studies to model calibration and validation", Comput. Geotech., 85(Supp C), 277-286. https://doi.org/10.1016/j.compgeo.2016.06.003.
  4. Armand. G., Bumbieler, F., Conil, N., de La Vaissiere, R., Bosgiraud, J.M. and Vu, M.N. (2017a), "Main outcomes from in situ THM experiments programme to demonstrate feasibility of radioactive HL-ILW disposal in the Callovo-Oxfordian claystone", J. Rock Mech. Geotech Eng., 9(3), 415-427. https://doi.org/10.1016/j.jrmge.2017.03.004
  5. Baille, W., Tripathy, S. and Schanz, T. (2010), "Swelling pressures and one-dimensional compressibility behaviour of bentonite at large pressures", Appl. Clay Sci., 48(3), 324-333. https://doi.org/10.1016/j.clay.2010.01.002.
  6. Chai, Z., Zhang, Y. and Scheuermann, A. (2016), "Study of physical simulation of electrochemical modification of clayey rock", Geomech. Eng., 11(2), 191-209. https://doi.org/10.12989/gae.2016.11.2.197.
  7. Chen, Z.G., Tang, C.S., Shen, Z., Liu, Y.M. and Shi, B. (2017), "The geotechnical properties of GMZ buffer/backfill material used in high-level radioactive nuclear waste geological repository: A review", Environ. Earth Sci., 76(7), 270. https://doi.org/10.1007/s12665-017-6580-2.
  8. Cotecchia, F. and Chandler, R.J. (1997), "The influence of structure on the pre-failure behaviour of a natural clay", Geotechnique, 47(3), 523-544. https://doi.org/10.1680/geot.1997.47.3.523.
  9. Cui, Y., Ta, A.N., Tang, A.M. and Lu, Y. (2010), "Investigation of the hydro-mechanical behaviour of compacted expansive clay", Front. Archit. Civ. Eng. China, 4(2), 154-164. https://doi.org/10.1007/s11709-010-0019-0.
  10. Cui, Y.J., Tang, A.M., Loiseau, C. and Delage, P. (2008), "Determining the unsaturated hydraulic conductivity of a compacted sand-bentonite mixture under constant-volume and free-swell conditions", Phys. Chem. Earth, Part A/B/C, 33, S462-S471. https://doi.org/10.1016/j.pce.2008.10.017.
  11. Dewhurst, D., Brown, K., Clennell, M. and Westbrook, G. (1996), "A comparison of the fabric and permeability anisotropy of consolidated and sheared silty clay", Eng. Geol., 42(4), 253-267. https://doi.org/10.1016/0013-7952(95)00089-5.
  12. Di Maio, C., Santoli, L. and Schiavone, P. (2004), "Volume change behaviour of clays: the influence of mineral composition, pore fluid composition and stress state", Mech. Mater., 36(5), 435-451. https://doi.org/10.1016/S0167-6636(03)00070-X.
  13. Djeran-Maigre, I., Tessier, D., Grunberger, D., Velde, B. and Vasseur, G. (1998), "Evolution of microstructures and of macroscopic properties of some clays during experimental compaction", Mar. Petrol. Geol., 15(2), 109-128. https://doi.org/10.1016/S0264-8172(97)00062-7.
  14. Engelhardt, W.V. and Gaida, K.H. (1963), "Concentration changes of pore solutions during compaction of clay sediments", J. Sediment. Res., 33(4), 919-930. https://doi.org/10.2110/33.4.919.
  15. Hamidi, S. and Marandi, S.M. (2018), "Effect of clay mineral types on the strength and microstructure properties of soft clay soils stabilized by epoxy resin", Geomech. Eng., 15(2), 729-738. https://doi.org/10.12989/gae.2018.15.2.729.
  16. Howell, J., Shackelford, C., Amer, N. and Stern, R. (1997), Compaction of Sand-Processed Clay Soil Mixtures, Scientific Publishing Company New York, U.S.A.
  17. Karig, D.E. and Hou, G. (1992), "High-stress consolidation experiments and their geologic implications", J. Geophys. Res. Solid Earth, 97(B1), 289-300. https://doi.org/10.1029/91JB02247.
  18. Kenney, T.C., Van Veen, W.A., Swallow, M.A. and Sungaila, M.A. (1992), "Hydraulic conductivity of compacted bentonie-sand mixture", Can. Geotech. J., 29(3), 264-274. https://doi.org/10.1139/t92-042.
  19. Komine, H. and Ogata, N. (1996), "Prediction for swelling characteristics of compacted bentonite", Can. Geotech. J., 33(1), 11-22. https://doi.org/10.1139/t96-021.
  20. Koochak Zadeh, M., Mondol, N.H. and Jahren, J. (2016), "Experimental mechanical compaction of sands and sand-clay mixtures: A study to investigate evolution of rock properties with full control on mineralogy and rock texture", Geophys. Prospect., 64(4), 915-941. https://doi.org/10.1111/1365-2478.12399.
  21. Li, L., Liu, J.Q., Liu, Z.B., Liu, T.G., Wang, W. and Shao, J.F. (2019), "Experimental investigation on compaction properties of sand-clay mixture at large pressure", Chin. J. Rock Soil Mech., 40(9), 3502- 3512.
  22. Li, W.P., Zhang, Z.Y., Sun, R.H., Wang, W.L. and Li, X.Q. (2006), "High pressure K (0) creep experiment and the anisotropy of microstructure of deep buried clay", Chin. J. Geotech. Eng., 28(10), 1185-1190. https://doi.org/10.3321/j.issn:1000-4548.2006.10.002
  23. Liu, Z., Shao, J., Feng, J., Xie, S., Bourbon, X. and Camps, G. (2020), "Shear strength of interface between high performance concrete and claystone in the context of French radioactive waste repository project", Geotechnique, In Press.
  24. Liu, Z.B., Shao, J.F., Liu, T.G., Xie, S.Y. and Conil, N. (2016), "Gas permeability evolution mechanism during creep of a low permeable claystone", Appl. Clay Sci., 129, 47-53. https://doi.org/10.1016/j.clay.2016.04.021.
  25. Liu, Z.B., Shao, J.F., Xie, S.Y., Conil, N. and Zha, W.H. (2018a), "Effects of relative humidity and mineral compositions on creep deformation and failure of a claystone under compression", Int. J. Rock Mech. Min. Sci., 103, 68-76. https://doi.org/10.1016/j.ijrmms.2018.01.015.
  26. Liu, Z.B., Xie, S.Y., Shao, J.F. and Conil, N. (2018b), "Multi-step triaxial compressive creep behaviour and induced gas permeability change of clay-rich rock", Geotechnique, 68(4), 281-289. https://doi.org/10.1680/jgeot.16.P.117.
  27. Maio, C.D. and Fenellif, G. (1994), "Residual strength of kaolin and bentonite: The influence of their constituent pore fluid", Geotechnique, 44(2), 217-226. https://doi.org/10.1680/geot.1994.44.2.217.
  28. Marcial, D., Delage, P. and Cui, Y.J. (2002), "On the high stress compression of bentonites", Can. Geotech. J., 39(4), 812-820. https://doi.org/10.1139/t02-019.
  29. Mollins, L., Stewart, D., Cousens, T. (1996), "Predicting the properties of bentonite-sand mixtures", Clay Miner., 31(2), 243-252. https://doi.org/10.1180/claymin.1996.031.2.10.
  30. Mondol, N.H., Bjorlykke, K. and Jahren, J. (2008), "Experimental compaction of clays: relationship between permeability and petrophysical properties in mudstones", Petrol. Geosci., 14(4), 319-337. https://doi.org/10.1144/1354-079308-773.
  31. Park, T.W., Kim, H.J., Tanvir, M.T., Lee, J.B. and Moon, S.G. (2018), "Influence of coarse particles on the physical properties and quick undrained shear strength of fine-grained soils", Geomech. Eng., 14(1), 99-105. https://doi.org/10.12989/gae.2018.14.1.099.
  32. Revil, A., Grauls, D. and Brevart, O. (2002), "Mechanical compaction of sand/clay mixtures", J. Geophys. Res. Solid Earth, 107(B11), ECV 11-11-ECV 11-15. https://doi.org/10.1029/2001JB000318.
  33. Rieke, H.H. and Chilingarian, G.V. (1974), Chapter 4 Effect of Compaction on Some Properties of Argillaceous Sediments, in Developments in Sedimentology, Elsevier, 123-217.
  34. Roberts, W.L. (1990), Encyclopedia of Minerals, 2nd Edition, Van Nostrand Reinhold, Chapman & Hall, New York, U.S.A.
  35. Robinet, J.C. (2008), "Mineralogie, porosite et diffusion des solutes dans l'argilite du Callovo-Oxfordien de Bure (Meuse, Haute-Marne, France) de l'echelle centimetrique a micrometrique", Universite de Poitiers, Poitiers, France.
  36. Shackelford, C.D., Howell, J.L., Amer, N.H. and Stern, R.T. (1997), "Compaction of sand-processed clay soil mixtures", Geotech. Test. J., 20(4), 443-458. https://doi.org/10.1520/GTJ10411J.
  37. Shang, X.Y., Zhou, G.Q., Kuang, L.F. and Cai, W. (2014), "Compressibility of deep clay in East China subjected to a wide range of consolidation stresses", Can. Geotech. J., 52(2), 244-250. https://doi.org/10.1139/cgj-2014-0129.
  38. Sobti, J. and Singh, S.K. (2017), "Hydraulic conductivity and compressibility characteristics of bentonite enriched soils as a barrier material for landfills", Innov. Infrastruct. Solut., 2(1), 12. https://doi.org/10.1007/s41062-017-0060-0.
  39. Sun, D.A., Chen, L., Zhang, J. and Zhou, A. (2015), "Bifurcation analysis of over-consolidated clays in different stress paths and drainage conditions", Geomech. Eng., 9(5), 669-685. http://doi.org/10.12989/gae.2015.9.5.669.
  40. Sun, D.A., Cui, H.B. and Sun, W.J. (2009), "Swelling of compacted sand-bentonite mixtures", Appl. Clay Sci., 43, 485-492. https://doi.org/10.1016/j.clay.2008.12.006.
  41. Sun, D.A., Zhang, L., Li, J. and Zhang, B.C. (2015), "Evaluation and prediction of the swelling pressures of GMZ bentonites saturated with saline solution", Appl. Clay Sci., 105, 207-216. https://doi.org/10.1016/j.clay.2014.12.032.
  42. Tripathy, S. and Schanz, T. (2007), "Compressibility behaviour of clays at large pressures", Can. Geotech. J., 44(3), 355-362. https://doi.org/10.1139/t06-123.
  43. Vasseur, G., Djeran-Maigre, I., Grunberger, D., Rousset, G., Tessier, D. and Velde, B. (1995), "Evolution of structural and physical parameters of clays during experimental compaction" Mar. Petrol. Geol., 12(8), 941-954. https://doi.org/10.1016/0264-8172(95)98857-2.
  44. Yang, D., Chanchole, S., Valli, P. and Chen, L. (2013), "Study of the anisotropic properties of argillite under moisture and mechanical loads", Rock Mech. Rock Eng., 46(2), 247-257. https://doi.org/10.1007/s00603-012-0267-5.
  45. Yang, D., Chen, W., Wang, L., Chen, L. and Wang, W. (2018), "Experimental microscopic investigation of the cyclic swelling and shrinkage of a natural hard clay", Geotechnique, 69(6), 481-488. https://doi.org/10.1680/jgeot.17.P.053.
  46. Ye, W.M., Lai, X.L., Wang, Q., Chen, Y.G., Chen, B. and Cui, Y.J. (2014), "An experimental investigation on the secondary compression of unsaturated GMZ01 bentonite", Appl. Clay Sci., 97-98, 104-109. https://doi.org/10.1016/j.clay.2014.05.012.
  47. Zhang, F., Hu, D.W., Xie, S.Y. and Shao, J.F. (2013), "Influences of temperature and water content on mechanical property of argillite", Eur. J. Environ. Civ. Eng., 18(2), 173-189. https://doi.org/10.1080/19648189.2013.852485.