1887
Volume 25, Issue 3
  • ISSN: 1354-0793
  • E-ISSN:

Abstract

Traditional methods for imaging salt bodies seldom consider near-salt stress perturbations caused by salt, and the associated velocity perturbations of seismic waves in the sediments near the salt. To demonstrate the importance of stress changes caused by the salt on accurately imaging salt bodies, in this study we develop and apply a combined method of geomechanical stress modelling and salt imaging. We simulate the stress perturbations in sediments induced by a salt sphere using a static geomechanical model, and calculate the associated velocity changes of seismic waves in the sediments by using our model stress perturbations. We use the reverse time migration and imaging method to image the salt sphere, and then analyse the imaging results of two cases including and excluding the effects of stress perturbations by the salt sphere on velocity changes of seismic waves. The results show that the near-salt velocity changes of seismic waves induced by stress perturbations near salt bodies can have a significant impact on the salt imaging. We find that when the effects of near-salt stress perturbations are ignored, the imaging of the salt sphere is clearly distorted: the salt sphere is extended vertically and becomes a salt ellipse with a vertical major axis. In contrast, when we include the effects of near-salt stress perturbations, the imaging of this salt sphere accurately matches the salt geometry and position. Thus, the near-salt stress perturbations should not be ignored in salt imaging. This study provides scientific insights for petroleum geologists and exploration geophysicists on the relationship between near-salt stress perturbations and accurate imaging of salt structures.

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This article is accompanied by the following content:
Mechanics of salt systems: state of the field in numerical methods
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Investigating controls on salt movement in extensional settings using finite-element modelling
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Simulation of salt-cavity healing based on a micro–macro model of pressure solution
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This article is accompanied by the following content:
Mechanics of salt systems: state of the field in numerical methods
Companion
This article is accompanied by the following content:
Simulation of salt-cavity healing based on a micro–macro model of pressure solution
Companion
This article is accompanied by the following content:
Investigating controls on salt movement in extensional settings using finite-element modelling
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2019-05-22
2020-09-21
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References

  1. Albertz, M.
    & Lingrey, S. 2012. Critical state finite element models of contractional fault-related folding: Part 1. Structural analysis. Tectonophysics, 576–577, 133–149, https://doi.org/10.1016/j.tecto.2012.05.015
    [Google Scholar]
  2. Archer, S.G., Alsop, G.I., Hartley, A.J., Grant, N.T. & Hodgkinson, R.
    2012. Salt tectonics, sediments and prospectivity: an introduction. In:Alsop, G.I. et al. (eds) Salt Tectonics, Sediments and Prospectivity, Geological Society, London, Special Publications, 363, 1–6, http://doi.org/10.1144/SP363.1
    [Google Scholar]
  3. Bradley, W.B
    . 1978. Bore hole failure near salt domes. Paper presented at theSPE Annual Fall Technical Conference and Exhibition, 1–3 October 1978, Houston, Texas, USA.
    [Google Scholar]
  4. Dusseault, M.B., Maury, V., Sanfilippo, F. & Santarelli, F.J.
    2004. Drilling around salt: risks, stresses, and uncertainties. Paper presented at theGulf Rocks 2004, the 6th North America Rock Mechanics Symposium (NARMS), 5–9 June 2004, Houston, Texas, USA.
    [Google Scholar]
  5. Feng, Y.E. & Reshef, M.
    2016. The Eastern Mediterranean Messinian salt-depth imaging and velocity analysis considerations. Petroleum Geoscience, 22, 333–339, https://doi.org/10.1144/petgeo2015-088
    [Google Scholar]
  6. Fredrich, J.T., Coblentz, D., Fossum, A.F. & Thorne, B.J.
    2003. Stress perturbations adjacent to salt bodies in the deep-water Gulf of Mexico. SPE Paper 84554 presented at theSociety of Petroleum Engineers Annual Technical Conference and Exhibition, 5–8 October 2003, Denver, Colorado, USA.
    [Google Scholar]
  7. Heidari, M., Nikolinakou, M.A., Hudec, M.R. & Flemings, P.B.
    2016. Geomechanical analysis of a welding salt layer and its effects on adjacent sediments. Tectonophysics, 683, 172–181, https://doi.org/10.1016/j.tecto.2016.06.027
    [Google Scholar]
  8. Hudec, M.R. & Jackson, M.P.A.
    2007. Terra infirma: Understanding salt tectonics. Earth-Science Reviews, 82, 1–28, https://doi.org/10.1016/j.earscirev.2007.01.001
    [Google Scholar]
  9. 2011. The Salt Mine: A Digital Atlas of Salt Tectonics. American Association of Petroleum Geologists, Tulsa, OK.
    [Google Scholar]
  10. Jackson, M.P.A. & Talbot, C.J.
    1991. A Glossary of Salt Tectonics. Bureau of Economic Geology, Geological Circular, 91, (4).
    [Google Scholar]
  11. Jia, X. & Wu, R.S.
    2009. Superwide-angle one-way wave propagator and its application in imaging steep salt flanks. Geophysics, 74, S75–S83, https://doi.org/10.1190/1.3124686
    [Google Scholar]
  12. Jones, I.F. & Davison, I.
    2014. Seismic imaging in and around salt bodies. Interpretation, 2, SL1–SL20, https://doi.org/10.1190/INT-2014-0033.1
    [Google Scholar]
  13. Keys, R., Matava, T., Foster, D. & Ashabranner, D.
    2017. Isotropic and anisotropic velocity model building for subsalt seismic imaging. Geophysics, 82, S247–S258, https://doi.org/10.1190/geo2016-0316.1
    [Google Scholar]
  14. Koupriantchik, D., Hunt, S.P., Boult, P.J. & Meyers, A.G
    . 2005. Geomechanical modeling of salt diapirs: Generic shapes and a 3D salt structure from the Officer Basin, South Australia. In: Barla, G. & Barla, M. (eds) Proceedings of the 11th International Conference on Computer Methods and Advances in Geomechanics, Torino, Italy, June 19, 2005.Patron Editore, Bologna, Italy, 1–9.
    [Google Scholar]
  15. Leveille, J.P., Jones, I.F., Zhou, Z.Z., Wang, B. & Liu, F.
    2011. Subsalt imaging for exploration, production, and development: A review. Geophysics, 76, WB3–WB20, https://doi.org/10.1190/geo2011-0156.1
    [Google Scholar]
  16. Luo, G., Nikolinakou, M.A., Flemings, P.B. & Hudec, M.R.
    2012. Geomechanical modeling of stresses adjacent to salt bodies: Part 1 – Uncoupled models. AAPG Bulletin, 96, 43–64, https://doi.org/10.1306/04111110144
    [Google Scholar]
  17. Luo, G., Flemings, P.B., Hudec, M.R. & Nikolinakou, M.A.
    2015. The role of pore fluid overpressure in the substrates of advancing salt sheets, ice glaciers, and critical-state wedges. Journal of Geophysical Research: Solid Earth, 120, 87–105, https://doi.org/10.1002/2014JB011326
    [Google Scholar]
  18. Luo, G., Hudec, M.R., Flemings, P.B. & Nikolinakou, M.A.
    2017. Deformation, stress, and pore pressure in an evolving suprasalt basin. Journal of Geophysical Research: Solid Earth, 122, 5663–5690, https://doi.org/10.1002/2016JB013779
    [Google Scholar]
  19. Mackay, F., Inoue, N., Fontoura, S.A.B. & Botelho, F.
    2008. Geomechanical effects of a 3D vertical salt well drilling by FEA. American Rock Mechanics Association Paper 08-041 presented at the42nd U.S. Rock Mechanics Symposium (USRMS), June 29–July 2, 2008, San Francisco, California, USA.
    [Google Scholar]
  20. Matava, T., Keys, R., Foster, D. & Ashabranner, D.
    2016. Isotropic and anisotropic velocity-model building for subsalt seismic imaging. The Leading Edge, 35, 240–245, https://doi.org/10.1190/tle35030240.1
    [Google Scholar]
  21. Mavko, G., Mukerji, T. & Godfrey, N.
    1995. Predicting stress-induced velocity anisotropy in rocks. Geophysics, 60, 1081–1087, https://doi.org/10.1190/1.1443836
    [Google Scholar]
  22. Murnaghan, F.D.
    1937. Finite deformations of an elastic solid. American Journal of Mathematics, 59, 235–260, https://doi.org/10.2307/2371405
    [Google Scholar]
  23. Nikolinakou, M.A., Luo, G., Hudec, M.R. & Flemings, P.B.
    2012. Geomechanical modeling of stresses adjacent to salt bodies: Part 2 – Poroelastoplasticity and coupled overpressures. AAPG Bulletin, 96, 65–85, https://doi.org/10.1306/04111110143
    [Google Scholar]
  24. Nikolinakou, M.A., Flemings, P.B. & Hudec, M.R.
    2014. Modeling stress evolution around a rising salt diapir. Marine and Petroleum Geology, 51, 230–238, https://doi.org/10.1016/j.marpetgeo.2013.11.021
    [Google Scholar]
  25. Nikolinakou, M.A., Heidari, M., Flemings, P.B. & Hudec, M.R.
    2018. Geomechanical modeling of pore pressure in evolving salt systems. Marine and Petroleum Geology, 93, 272–286, https://doi.org/10.1016/j.marpetgeo.2018.03.013
    [Google Scholar]
  26. Nur, A.
    1971. Effects of stress on velocity anisotropy in rocks with cracks. Journal of Geophysical Research, 76, 2022–2034, https://doi.org/10.1029/JB076i008p02022
    [Google Scholar]
  27. Nur, A. & Simmons, G.
    1969. Stress-induced velocity anisotropy in rock: An experimental study. Journal of Geophysical Research, 74, 6667–6674, https://doi.org/10.1029/JB074i027p06667
    [Google Scholar]
  28. Prioul, R., Bakulin, A. & Bakulin, V.
    2004. Nonlinear rock physics model for estimation of 3D subsurface stress in anisotropic formations. Theory and laboratory verification. Geophysics, 69, 415–425, https://doi.org/10.1190/1.1707061
    [Google Scholar]
  29. Sayers, C.M.
    1999. Stress-dependent seismic anisotropy of shales. Geophysics, 64, 93–98, https://doi.org/10.1190/1.1444535
    [Google Scholar]
  30. 2002. Stress-dependent elastic anisotropy of sandstones. Geophysical Prospecting, 50, 85–95, https://doi.org/10.1046/j.1365-2478.2002.00289.x
    [Google Scholar]
  31. 2005. Sensitivity of elastic-wave velocities to stress changes in sandstones. The Leading Edge, 24, 1262–1266, https://doi.org/10.1190/1.2149646
    [Google Scholar]
  32. 2010. Geophysics Under Stress. Geomechanical Applications of Seismic and Borehole Acoustic Waves. Distinguished Instructor Short Course. Society of Exploration Geophysicists, Tulsa, OK, https://doi.org/10.1190/1.9781560802129.ch5
    [Google Scholar]
  33. Sayers, C.M. & Kachanov, M.
    1995. Microcrack-induced elastic wave anisotropy of brittle rocks. Journal of Geophysical Research: Solid Earth, 100, 4149–4156, https://doi.org/10.1029/94JB03134
    [Google Scholar]
  34. Schultz-Ela, D.D.
    2003. Origin of drag folds bordering salt diapirs. AAPG Bulletin, 87, 757–780, https://doi.org/10.1306/12200201093
    [Google Scholar]
  35. Schultz-Ela, D.D. & Walsh, P.
    2002. Modeling of grabens extending above evaporites in Canyonlands National Park, Utah. Journal of Structural Geology, 24, 247–275, https://doi.org/10.1016/S0191-8141(01)00066-9
    [Google Scholar]
  36. Sengupta, M., Bachrach, R. & Bakulin, A.
    2010. Relationship between velocity and anisotropy perturbations and anomalous stress field around salt bodies. The Leading Edge, 28, 598–605, https://doi.org/10.1190/1.3124936
    [Google Scholar]
  37. Thomsen, L.
    1986. Weak elastic anisotropy. Geophysics, 51, 1954–1966, https://doi.org/10.1190/1.1442051
    [Google Scholar]
  38. Tromp, J. & Trampert, J.
    2018. Effects of induced stress on seismic forward modelling and inversion. Geophysical Journal International, 213, 851–867, https://doi.org/10.1093/gji/ggy020
    [Google Scholar]
  39. Verdon, J.P., Angus, D.A., Michael Kendall, J. & Hall, S.A.
    2008. The effect of microstructure and nonlinear stress on anisotropic seismic velocities. Geophysics, 73, D41–D51, https://doi.org/10.1190/1.2931680
    [Google Scholar]
  40. Virieux, J.
    1986. P-SV wave propagation in heterogeneous media: Velocity–stress finite-difference method. Geophysics, 51, 889–901, https://doi.org/10.1190/1.1442147
    [Google Scholar]
  41. Whitson, C.D. & McFadyen, M.K.
    2001. Lessons learned in the planning and drilling of deep, subsalt wells in the deep-water Gulf of Mexico. Paper presented at theSPE Annual Technical Conference and Exhibition, 30 September–3 October 2001, New Orleans, Louisiana, USA.
    [Google Scholar]
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