1887
Volume 50, Issue 6
  • ISSN: 0812-3985
  • E-ISSN: 1834-7533

Abstract

We have recovered legacy 2D seismic data from the Kalahari Karoo Basin, Botswana, which show signatures associated with the coalbed-methane-bearing seams of the Mmamabula and Morupule formations. These deeply buried coal seams (∼ 500 m below surface) may represent a new alternative source of energy for the region. Prior to interpreting the seismic data, we improved imaging of the coal seams by attenuating noise with the curvelet transform. The data were transformed to the curvelet domain, and scale and angular direction thresholds were selected and applied, thereby removing previous processing artefacts and noise. The resulting denoised seismic data are characterised by a high signal-to-noise ratio, showing a clear continuity of the seismic reflections associated with the coal seams. We constrained the seismic interpretation with borehole logs, which confirmed the locations of the coal sequence at the top of the Mmamabula and Morupule formations. The curvelet-denoised seismic sections enable a more reliable mapping of the coal zone, which is displaced by major faults with throws of up to ∼ 500 m. Following these encouraging results, we emphasised the value of enhancing and reinterpreting legacy data, as it is a cost-effective and environmentally-friendly method for deep coal seam and mineral exploration.

© 2019 Australian Society of Exploration Geophysics
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2019-11-02
2026-01-14

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References

  1. Advanced Resources International 2003 Results of the central Kalahari Karoo Basin coalbed methane feasibility study, prepared for the Department of Geologic Survey, Botswana, Lobatse. Advanced Resources International, Arlington, Virginia, USA.
  2. Advanced Resources International 2008 Technical and economic feasibility study for coalbed methane development in eastern Botswana, prepared for Botswana Development Corporation and U.S. Trade and Development Agency. Advanced Resources International, Arlington, Virginia, USA.
  3. Bordy, E.M., T. Segwabe, and B. Makuke 2010 Sedimentology of the upper Triassic–lower Jurassic (?) Mosolotsane Formation (Karoo Supergroup), Kalahari Karoo Basin, Botswana. Journal of African Earth Sciences58: 127–140. doi: 10.1016/j.jafrearsci.2010.02.006
     https://doi.org/10.1016/j.jafrearsci.2010.02.006 [Google Scholar]
  4. Brett, J.S., R. Mason, and P.H. Smith 2000 Geophysical exploration of the Kalahari Suture zone. Journal of African Earth Sciences30: 489–497. doi: 10.1016/S0899‑5362(00)00034‑8
     https://doi.org/10.1016/S0899-5362(00)00034-8 [Google Scholar]
  5. Cairncross, B. 2001 An overview of the Permian (Karoo) coal deposits of Southern Africa. African Earth Sciences33: 529–562. doi: 10.1016/S0899‑5362(01)00088‑4
     https://doi.org/10.1016/S0899-5362(01)00088-4 [Google Scholar]
  6. Canales, L.L. 1984 Random noise reduction. Presented at the 54th SEG Conference and Published in the SEG Technical Program Expanded Abstracts3, no. 1: 525–572.
     [Google Scholar]
  7. Candès, E.J., L. Demanet, D.L. Donoho, and L. Ying 2005 Fast discrete curvelet transforms, technical report, California Institute of Technology.www.curvelet.org.
  8. Candès, E.J., and D.L. Donoho 2004 New tight frames of curvelets and optimal representations of objects with piecewise C2 singularities. Communications on Pure and Applied Mathematics57: 219–266. doi: 10.1002/cpa.10116
     https://doi.org/10.1002/cpa.10116 [Google Scholar]
  9. Candès, E.J., and F. Guo 2002 New multiscale transforms, minimum total variation synthesis: applications to edge-preserving image reconstruction. Signal Processing82: 1519–1543. doi: 10.1016/S0165‑1684(02)00300‑6
     https://doi.org/10.1016/S0165-1684(02)00300-6 [Google Scholar]
  10. Clark, G.C., N.P. Lock, and R.A. Smith 1986 Coal resources of Botswana. Mineral Deposits of Southern Africa. Geological Society of South Africa, Johannesburg, 2071–2085.
  11. Donoho, D.L., and P.B. Stark 1989 Uncertainty principles and signal recovery. Society for Industrial and Applied Mathematics Journal of Applied Mathematics49, no. 3: 906–931. doi: 10.1137/0149053
     https://doi.org/10.1137/0149053 [Google Scholar]
  12. Eaton, D.W., E. Adam, B. Milkereit, M. Salisbury, B. Roberts, D. White, and J. Wright 2010 Enhancing base-metal exploration with seismic imaging. Canadian Journal of Earth Sciences47, no. 5: 741–760. doi: 10.1139/E09‑047
     https://doi.org/10.1139/E09-047 [Google Scholar]
  13. Gochioco, L.M. 1991 Advances in seismic reflection profiling for US coal exploration. The Leading Edge10, no. 12: 24–29. doi: 10.1190/1.1436798
     https://doi.org/10.1190/1.1436798 [Google Scholar]
  14. Gochioco, L.M. 2000 High-resolution 3-D seismic survey over a coal mine reserve area in the U.S. – a case study. Geophysics65: 712–718. doi: 10.1190/1.1444770
     https://doi.org/10.1190/1.1444770 [Google Scholar]
  15. Gochioco, L.M., J.R. Gochioco, and F. Ruev Jr 2012 Coal geophysics expands with growing global demands for mine safety and productivity. The Leading Edge31, no. 3: 308–314. doi: 10.1190/1.3694898
     https://doi.org/10.1190/1.3694898 [Google Scholar]
  16. Goossens, R.F., and D.J. Buchanan 1984 The role of seismic surveying in coal mining exploration. Mining Science and Technology1, no. 4: 253–267. doi: 10.1016/S0167‑9031(84)90299‑8
     https://doi.org/10.1016/S0167-9031(84)90299-8 [Google Scholar]
  17. Górszczyk, A., A. Adamczyk, and M. Malinowski 2014 Application of curvelet denoising to 2D and 3D seismic data — practical considerations. Journal of Applied Geophysics105: 78–94. doi: 10.1016/j.jappgeo.2014.03.009
     https://doi.org/10.1016/j.jappgeo.2014.03.009 [Google Scholar]
  18. Hennenfent, G., and F.J. Herrmann 2006 Seismic denoising with nonuniformly sampled curvelets. Computing in Science & Engineering8, no. 3: 16–25. doi: 10.1109/MCSE.2006.49
     https://doi.org/10.1109/MCSE.2006.49 [Google Scholar]
  19. Henson Jr, H., and J.L. Sexton 1991 Premine study of shallow coal seams using high-resolution seismic reflection methods. Geophysics56, no. 9: 1494–1503. doi: 10.1190/1.1443171
     https://doi.org/10.1190/1.1443171 [Google Scholar]
  20. Hildebrand, R., M. Bishop, and M. Cronshaw 2009 Evaluating coalbed methane plays in frontier areas — from example from Southern Africa. AAPG Annual Convention and Exhibition, Denver, Colorado, USA.
  21. Jeng, Y., Y.-W. Li, C.-S. Chen, and H.-Y. Chien 2009 Adaptive filtering of random noise in near-surface seismic and ground-penetrating radar data. Journal of Applied Geophysics68, no. 1: 36–46. doi: 10.1016/j.jappgeo.2008.08.013
     https://doi.org/10.1016/j.jappgeo.2008.08.013 [Google Scholar]
  22. Khan, O., M. Spaak, and A. Vial-Aussavy 2017 Realizing the potential of legacy seismic – getting more value from vintage data. Abu Dhabi International Petroleum Exhibition and Conference, Extended Abstracts, SPE-188678-MS.
  23. Krey, T., H. Arnetzl, and M. Knecht 1982 Theoretical and practical aspects of absorption in the application of in-seam seismic coal exploration. Geophysics47, no. 12: 1645–1656. doi: 10.1190/1.1441314
     https://doi.org/10.1190/1.1441314 [Google Scholar]
  24. Malehmir, A., R. Durrheim, G. Bellefleur, M. Urosevic, C. Juhlin, D.J. White, B. Milkereit, and G. Campbell 2012 Seismic methods in mineral exploration and mine planning: a general overview of past and present case histories and a look into the future. Geophysics77, no. 5: WC173–WC190. doi: 10.1190/geo2012‑0028.1
     https://doi.org/10.1190/geo2012-0028.1 [Google Scholar]
  25. Manzi, M.S.D., K.A.A. Hein, R.J. Durrheim, and N. King 2013 Seismic attribute analysis to enhance detection of thin gold-bearing reefs: South deep gold mine, Witwatersrand basin, South Africa. Journal of Applied Geophysics98: 212–228. doi: 10.1016/j.jappgeo.2013.08.017
     https://doi.org/10.1016/j.jappgeo.2013.08.017 [Google Scholar]
  26. Martin, G.S., R. Wiley, and K.J. Marfurt 2006 Marmousi2: an elastic upgrade for Marmousi. The Leading Edge25, no. 2: 156–166. doi: 10.1190/1.2172306
     https://doi.org/10.1190/1.2172306 [Google Scholar]
  27. Meixner, H.M., and R.J. Peart 1984 The Kalahari Drilling Project: a report on the geophysical and geological results of follow-up drilling to the aeromagnetic Survey of Botswana, Vol. 27. Geological Survey Department.
  28. Milkov, A.V., J. Potgieter, M. Faiz, A. Mayers, and I. Parker 2017 Evaluation of coal bed methane play in the eastern part of the central Kalahari Karoo Basin (Botswana). Abstract, AAPG Annual Convention and Exhibition, Houston, Texas, USA.
  29. Naghizadeh, M., and M. Sacchi 2018 Ground-roll attenuation using curvelet downscaling. Geophysics83, no. 3: V185–V195. doi: 10.1190/geo2017‑0562.1
     https://doi.org/10.1190/geo2017-0562.1 [Google Scholar]
  30. Neelamani, R., A.I. Baumstein, D.G. Gillard, M.T. Hadidi, and W.L. Soroka 2008 Coherent and random noise attenuation using the curvelet transform. The Leading Edge27, no. 2: 240–248. doi: 10.1190/1.2840373
     https://doi.org/10.1190/1.2840373 [Google Scholar]
  31. Prasad, P.P., K. Dhanam, P.P. Kishore, D. Mysaiah, and T. Seshunarayana 2015 High resolution seismic reflection studies in Godavari coal fields: mapping of coal seams and associated structural features. Journal of the Geological Society of India86, no. 3: 317–323. doi: 10.1007/s12594‑015‑0317‑1
     https://doi.org/10.1007/s12594-015-0317-1 [Google Scholar]
  32. Reeves, C.V. 1978 The reconnaissance aeromagnetic survey of Botswana, 1975–1977. Final interpretation report. Terra Surveys Ltd, Botswana Geological Survey Department, p. 315.
  33. Schaller, M., O. Steiner, I. Studer, L. Holzer, M. Herwegh, and J.D. Kramers 1999 Exhumation of Limpopo Central Zone granulites and dextral continent-scale transcurrent movement at 2.0 Ga along the Palala Shear Zone, Northern Province, South Africa. Precambrian Research96: 263–288. doi: 10.1016/S0301‑9268(99)00015‑7
     https://doi.org/10.1016/S0301-9268(99)00015-7 [Google Scholar]
  34. Shan, H., J. Ma, and H. Yang 2009 Comparisons of wavelets, contourlets and curvelets in seismic denoising. Journal of Applied Geophysics69: 103–115. doi: 10.1016/j.jappgeo.2009.08.002
     https://doi.org/10.1016/j.jappgeo.2009.08.002 [Google Scholar]
  35. Singletary, S.J., R.E. Hanson, M.W. Martin, and J.L. Crowley 2003 Geochronology of basement rocks in the Kalahari Desert, Botswana, and implications for regional Proterozoic tectonics. Precambrian Research121: 47–71. doi: 10.1016/S0301‑9268(02)00201‑2
     https://doi.org/10.1016/S0301-9268(02)00201-2 [Google Scholar]
  36. Starck, J.-L., E.J. Candès, and D. Donoho 2002 The curvelet transform for image denoising. IEEE Transactions on Image Processing11, no. 6: 670–684. doi: 10.1109/TIP.2002.1014998
     https://doi.org/10.1109/TIP.2002.1014998 [Google Scholar]
  37. Taner, M.T. 2001 Seismic attributes. CSEG Recorder26, no. 7: 49–56.
     [Google Scholar]
  38. Taner, M.T., and R.E. Sheriff 1977 Application of amplitude, frequency, and other attributes to stratigraphic and hydrocarbon determination: Section 2. Application of seismic reflection configuration to stratigraphic interpretation, 301–327.
  39. Terracin, M., and M. Manzi 2017 Spatial corrections for post-stack time migrated legacy 2D seismic data: a case study from the Witwatersrand Basin, South Africa. South African Geophysical Association Biennial Conference, Sommerset West, Cape Town.
  40. Tselentis, G.A., and P. Paraskevopoulos 2002 Application of a high-resolution seismic investigation in a Greek coal mine. Geophysics67, no. 1: 50–59. doi: 10.1190/1.1451326
     https://doi.org/10.1190/1.1451326 [Google Scholar]
  41. Urosevic, M., B.J. Evans, and P.J. Hatherly 1992 The improvement in seismic resolution by map and trace attribute analysis. Exploration Geophysics23, no. 2: 387–391. doi: 10.1071/EG992387
     https://doi.org/10.1071/EG992387 [Google Scholar]
  42. Walton, C., B. Evans, and M. Urosevic 2000 Imaging coal seam structure using 3-D seismic methods. Exploration Geophysics31, no. 3: 509–514. doi: 10.1071/EG00509
     https://doi.org/10.1071/EG00509 [Google Scholar]
  43. Widess, M.B. 1973 How thin is a thin bed?Geophysics38, no. 6: 1176–1180. doi: 10.1190/1.1440403
     https://doi.org/10.1190/1.1440403 [Google Scholar]
  44. Yilmaz, Ö 1986 Seismic data processing. Tulsa, Oklahoma, USA: SEG.
/content/journals/10.1080/08123985.2019.1660576
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Post-stack denoising of legacy reflection seismic data: implications for coalbed methane exploration, Kalahari Karoo Basin, Botswana
Exploration Geophysics 50, 667 (2019); https://doi.org/10.1080/08123985.2019.1660576
/content/journals/10.1080/08123985.2019.1660576
/content/journals/10.1080/08123985.2019.1660576
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  • Article Type: Research Article
Keyword(s): Africa; coal; noise; post-stack; Seismic reflection; transform

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