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postgraduate thesis: Determination of geophysics properties of seabed sediments with multi-scanner core logger (MSCL)

TitleDetermination of geophysics properties of seabed sediments with multi-scanner core logger (MSCL)
Authors
Issue Date2015
PublisherThe University of Hong Kong (Pokfulam, Hong Kong)
Citation
Ng, S. [吳思琦]. (2015). Determination of geophysics properties of seabed sediments with multi-scanner core logger (MSCL). (Thesis). University of Hong Kong, Pokfulam, Hong Kong SAR. Retrieved from http://dx.doi.org/10.5353/th_b5677229
AbstractThis project aims to study the plausibility of using geophysical method alone to study the physical properties of offshore sediments in Hong Kong. GEOTEK’s Multi-scanner Core Logger is an automatic device that allows the continuous measurement of physical properties in a fast, high resolution and non-destructive manner. HKUV10, a bored core that is retrieved from the offshore area South of Lantau Island, is studied in this project. Physical properties, including bulk density, fractional porosity, P-wave velocity, P-wave amplitude, impedance and magnetic susceptibility are measured along core. The measured geophysical properties of HKUV10 are compared against findings in the literature. The Quaternary offshore geology in Hong Kong has been well studied (Davis, 1999, Fyfe et al., 1997, Fyfe et al., 1999, Yim, 1994, Yim et al., 2004). Two established geological model are used as reference for the comparison. They are Fyfe et al. (1997) and Yim (1994) respectively. Correlation plots are made from the physical properties measured. It is found that bulk density and fractional porosity are closely correlated as expected. Some correlation is found between magnetic susceptibility and density, as well as magnetic susceptibly and fractional porosity. However, little correlation was found between bulk density and P-wave velocity. This is because of the incorrect measurement of P-wave velocity. Secondly, the measured physical properties are plotted against the depth of core. It is found that in the first 3 to 4m, an abruptly elevated magnetic susceptibility of sediment is observed. The observation agrees with the finding from Chan et al. (1999) and Yim et al. (2004). Thirdly, it is suggested that core depth may be 3 to 17.2m is a marine deposit and 17.2 to 25.7m may be terrestrial deposits. The suggestion is made based on past research that shows high level of magnetic susceptibility could be found in terrestrial deposits (Tovey and Yim, 2002, Yim et al., 2004).
DegreeMaster of Science
SubjectMarine sediments - China - Hong Kong
Dept/ProgramApplied Geosciences
Persistent Identifierhttp://hdl.handle.net/10722/223121

 

DC FieldValueLanguage
dc.contributor.authorNg, Sze-ki-
dc.contributor.author吳思琦-
dc.date.accessioned2016-02-19T23:09:56Z-
dc.date.available2016-02-19T23:09:56Z-
dc.date.issued2015-
dc.identifier.citationNg, S. [吳思琦]. (2015). Determination of geophysics properties of seabed sediments with multi-scanner core logger (MSCL). (Thesis). University of Hong Kong, Pokfulam, Hong Kong SAR. Retrieved from http://dx.doi.org/10.5353/th_b5677229-
dc.identifier.urihttp://hdl.handle.net/10722/223121-
dc.description.abstractThis project aims to study the plausibility of using geophysical method alone to study the physical properties of offshore sediments in Hong Kong. GEOTEK’s Multi-scanner Core Logger is an automatic device that allows the continuous measurement of physical properties in a fast, high resolution and non-destructive manner. HKUV10, a bored core that is retrieved from the offshore area South of Lantau Island, is studied in this project. Physical properties, including bulk density, fractional porosity, P-wave velocity, P-wave amplitude, impedance and magnetic susceptibility are measured along core. The measured geophysical properties of HKUV10 are compared against findings in the literature. The Quaternary offshore geology in Hong Kong has been well studied (Davis, 1999, Fyfe et al., 1997, Fyfe et al., 1999, Yim, 1994, Yim et al., 2004). Two established geological model are used as reference for the comparison. They are Fyfe et al. (1997) and Yim (1994) respectively. Correlation plots are made from the physical properties measured. It is found that bulk density and fractional porosity are closely correlated as expected. Some correlation is found between magnetic susceptibility and density, as well as magnetic susceptibly and fractional porosity. However, little correlation was found between bulk density and P-wave velocity. This is because of the incorrect measurement of P-wave velocity. Secondly, the measured physical properties are plotted against the depth of core. It is found that in the first 3 to 4m, an abruptly elevated magnetic susceptibility of sediment is observed. The observation agrees with the finding from Chan et al. (1999) and Yim et al. (2004). Thirdly, it is suggested that core depth may be 3 to 17.2m is a marine deposit and 17.2 to 25.7m may be terrestrial deposits. The suggestion is made based on past research that shows high level of magnetic susceptibility could be found in terrestrial deposits (Tovey and Yim, 2002, Yim et al., 2004).-
dc.languageeng-
dc.publisherThe University of Hong Kong (Pokfulam, Hong Kong)-
dc.relation.ispartofHKU Theses Online (HKUTO)-
dc.rightsCreative Commons: Attribution 3.0 Hong Kong License-
dc.rightsThe author retains all proprietary rights, (such as patent rights) and the right to use in future works.-
dc.subject.lcshMarine sediments - China - Hong Kong-
dc.titleDetermination of geophysics properties of seabed sediments with multi-scanner core logger (MSCL)-
dc.typePG_Thesis-
dc.identifier.hkulb5677229-
dc.description.thesisnameMaster of Science-
dc.description.thesislevelMaster-
dc.description.thesisdisciplineApplied Geosciences-
dc.description.naturepublished_or_final_version-
dc.identifier.doi10.5353/th_b5677229-

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