dc.contributor.author |
Nkosi, Nomqhele Z
|
|
dc.contributor.author |
Manzi, MSD
|
|
dc.contributor.author |
Westgate, M
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|
dc.contributor.author |
Roberts, Dave
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|
dc.contributor.author |
Durrheim, RJ
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|
dc.contributor.author |
Ogasawara, H
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dc.contributor.author |
Ziegler, M
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|
dc.contributor.author |
Rickenbacher, M
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|
dc.contributor.author |
Liebenberg, B
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|
dc.contributor.author |
Onstott, TC
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|
dc.date.accessioned |
2022-12-02T07:38:00Z |
|
dc.date.available |
2022-12-02T07:38:00Z |
|
dc.date.issued |
2022-07 |
|
dc.identifier.citation |
Nkosi, N.Z., Manzi, M., Westgate, M., Roberts, D., Durrheim, R., Ogasawara, H., Ziegler, M. & Rickenbacher, M. et al. 2022. Physical property studies to elucidate the source of seismic reflectivity within the ICDP DSeis seismogenic zone: Klerksdorp goldfield, South Africa. <i>International Journal of Rock Mechanics and Mining Sciences, 155.</i> http://hdl.handle.net/10204/12544 |
en_ZA |
dc.identifier.issn |
1365-1609 |
|
dc.identifier.issn |
1873-4545 |
|
dc.identifier.issn |
https://doi.org/10.1016/j.ijrmms.2022.105082 |
|
dc.identifier.uri |
http://hdl.handle.net/10204/12544
|
|
dc.description.abstract |
Petrophysical properties of cylindrical core specimens from three boreholes from the International Continental Scientific Drilling Program, the DSeis project, measured at ambient pressure and room temperature conditions in various laboratories are presented and compared with downhole petrophysical data (sonic and density). The measured properties are from sixty-six rock specimens constituting metasediments, metabasalts and intrusives. Seismic velocities were measured using 0.5 MHz P- and S-wave transducers. To investigate the source of seismic reflectivity observed on the 2D legacy seismic data, we computed synthetic seismograms for adjacent rock units using downhole petrophysical data and compared them with seismic reflections from the reflection seismic profile. The experimental measurements show that the metasediments exhibit lower bulk densities and seismic velocities than the metabasalts and intrusive specimens. The porosity was found to be less than 2% for all the samples. No clear trends emerge when the Poisson's ratio is plotted against the P-wave velocities and porosities of the samples. A positive relationship is observed between the bulk modulus and P-wave velocities of the rock samples. The highest calculated reflection coefficients (RC) are associated with the metasediment-intrusive interfaces in all three boreholes. The intrusive-metabasalt and the metasediment-metabasalt interfaces exhibit low RC. Synthetic seismograms reveal strong reflections that coincide with high RC calculated using the bulk density and velocity data. The synthetic seismograms also revealed additional strong reflections that were not identified using the reflection coefficients calculated from the rock specimens, due to core loss in some lithological units. Successful correlations are carried out between the synthetic seismic data and the real seismic data, enabling us to correlate the stratigraphic sequence drilled in the boreholes to the seismic reflections observed on the legacy 2D reflection seismic data. |
en_US |
dc.format |
Abstract |
en_US |
dc.language.iso |
en |
en_US |
dc.relation.uri |
https://www.sciencedirect.com/science/article/pii/S1365160922000508 |
en_US |
dc.source |
International Journal of Rock Mechanics and Mining Sciences, 155 |
en_US |
dc.subject |
P-wave velocity |
en_US |
dc.subject |
Mining induced earthquakes |
en_US |
dc.subject |
Sonic logs |
en_US |
dc.subject |
Synthetic seismogram |
en_US |
dc.subject |
S-wave velocity |
en_US |
dc.subject |
Ultrasonic velocity |
en_US |
dc.title |
Physical property studies to elucidate the source of seismic reflectivity within the ICDP DSeis seismogenic zone: Klerksdorp goldfield, South Africa |
en_US |
dc.type |
Article |
en_US |
dc.description.pages |
17pp |
en_US |
dc.description.note |
© 2022 Elsevier Ltd. Due to copyright restrictions, the attached PDF file only contains the abstract of the full text item. For access to the full text item, please consult the publisher's website: https://www.sciencedirect.com/science/article/pii/S1365160922000508 |
en_US |
dc.description.cluster |
Mining |
en_US |
dc.description.impactarea |
Mining and Mineral Resources |
en_US |
dc.identifier.apacitation |
Nkosi, N. Z., Manzi, M., Westgate, M., Roberts, D., Durrheim, R., Ogasawara, H., ... Onstott, T. (2022). Physical property studies to elucidate the source of seismic reflectivity within the ICDP DSeis seismogenic zone: Klerksdorp goldfield, South Africa. <i>International Journal of Rock Mechanics and Mining Sciences, 155</i>, http://hdl.handle.net/10204/12544 |
en_ZA |
dc.identifier.chicagocitation |
Nkosi, Nomqhele Z, MSD Manzi, M Westgate, Dave Roberts, RJ Durrheim, H Ogasawara, M Ziegler, M Rickenbacher, B Liebenberg, and TC Onstott "Physical property studies to elucidate the source of seismic reflectivity within the ICDP DSeis seismogenic zone: Klerksdorp goldfield, South Africa." <i>International Journal of Rock Mechanics and Mining Sciences, 155</i> (2022) http://hdl.handle.net/10204/12544 |
en_ZA |
dc.identifier.vancouvercitation |
Nkosi NZ, Manzi M, Westgate M, Roberts D, Durrheim R, Ogasawara H, et al. Physical property studies to elucidate the source of seismic reflectivity within the ICDP DSeis seismogenic zone: Klerksdorp goldfield, South Africa. International Journal of Rock Mechanics and Mining Sciences, 155. 2022; http://hdl.handle.net/10204/12544. |
en_ZA |
dc.identifier.ris |
TY - Article
AU - Nkosi, Nomqhele Z
AU - Manzi, MSD
AU - Westgate, M
AU - Roberts, Dave
AU - Durrheim, RJ
AU - Ogasawara, H
AU - Ziegler, M
AU - Rickenbacher, M
AU - Liebenberg, B
AU - Onstott, TC
AB - Petrophysical properties of cylindrical core specimens from three boreholes from the International Continental Scientific Drilling Program, the DSeis project, measured at ambient pressure and room temperature conditions in various laboratories are presented and compared with downhole petrophysical data (sonic and density). The measured properties are from sixty-six rock specimens constituting metasediments, metabasalts and intrusives. Seismic velocities were measured using 0.5 MHz P- and S-wave transducers. To investigate the source of seismic reflectivity observed on the 2D legacy seismic data, we computed synthetic seismograms for adjacent rock units using downhole petrophysical data and compared them with seismic reflections from the reflection seismic profile. The experimental measurements show that the metasediments exhibit lower bulk densities and seismic velocities than the metabasalts and intrusive specimens. The porosity was found to be less than 2% for all the samples. No clear trends emerge when the Poisson's ratio is plotted against the P-wave velocities and porosities of the samples. A positive relationship is observed between the bulk modulus and P-wave velocities of the rock samples. The highest calculated reflection coefficients (RC) are associated with the metasediment-intrusive interfaces in all three boreholes. The intrusive-metabasalt and the metasediment-metabasalt interfaces exhibit low RC. Synthetic seismograms reveal strong reflections that coincide with high RC calculated using the bulk density and velocity data. The synthetic seismograms also revealed additional strong reflections that were not identified using the reflection coefficients calculated from the rock specimens, due to core loss in some lithological units. Successful correlations are carried out between the synthetic seismic data and the real seismic data, enabling us to correlate the stratigraphic sequence drilled in the boreholes to the seismic reflections observed on the legacy 2D reflection seismic data.
DA - 2022-07
DB - ResearchSpace
DP - CSIR
J1 - International Journal of Rock Mechanics and Mining Sciences, 155
KW - P-wave velocity
KW - Mining induced earthquakes
KW - Sonic logs
KW - Synthetic seismogram
KW - S-wave velocity
KW - Ultrasonic velocity
LK - https://researchspace.csir.co.za
PY - 2022
SM - 1365-1609
SM - 1873-4545
SM - https://doi.org/10.1016/j.ijrmms.2022.105082
T1 - Physical property studies to elucidate the source of seismic reflectivity within the ICDP DSeis seismogenic zone: Klerksdorp goldfield, South Africa
TI - Physical property studies to elucidate the source of seismic reflectivity within the ICDP DSeis seismogenic zone: Klerksdorp goldfield, South Africa
UR - http://hdl.handle.net/10204/12544
ER -
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en_ZA |
dc.identifier.worklist |
25865 |
en_US |