Advances in Earth Science ›› 2012, Vol. 27 ›› Issue (3): 359-366. doi: 10.11867/j.issn.1001-8166.2012.03.0359

Special Issue: IODP

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Applications of Rock Physics Models to the Deep-sea Sediment Drift at ODP Site 1144, Northern South China Sea

Wang Peng, Zhong Guangfa   

  1. Wang Peng, Zhong Guangfa
  • Received:2012-02-19 Revised:2012-02-29 Online:2012-03-10 Published:2014-06-10

Wang Peng, Zhong Guangfa. Applications of Rock Physics Models to the Deep-sea Sediment Drift at ODP Site 1144, Northern South China Sea[J]. Advances in Earth Science, 2012, 27(3): 359-366.

ODP Site 1144 is the only site for drilling into the sediment drift offshore Dongsha Islands, northern South China Sea. Integration of core and logging data from this site provides a good basis for reconstructing the rock physics model of the deep-sea sediment drift, which is of significance for understanding the relation between the lithological and elastic parameters of the deep-sea sediment and for the quantitative prediction of rock properties by reflection seismic data. The rock physical models for the deep-sea sediments are reviewed, including the Wood′s suspension model, the identical spherical grain contact model, and Sun′s velocity-porosity model for deep-sea sediments. Based on data of core smear slide analysis, the deep-sea sediments at Site 1144 are simplified as consisting of four major mineral components, which are clay minerals, which are carbonate, terrigenous clastic minerals and siliceous minerals, respectively. The elastic moduli and density of the latter three mineral components are substituted by using the corresponding values of their representative minerals, which are calcite, quartz, and opal; and the effective parameters of the clay minerals are determined by using the VoigtReuss-Hill and volume averaging, respectively. All the three rock physics models are applied into the deep-sea sediments at Site 1144 to estimate their P-wave velocity, which is then compared with that from the sonic logging. The result suggests that the estimated result  by  Sun′s model is most suitable to the measured result with the smallest error, that of Wood′s model matches the measured result in the shallow area but deviates from it with relative small error in the deep area, while that of the identical spherical grain contact model is overall higher than measured result  with relative big error.

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