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Rock Physical Interpretation of Geophysical Data for Soil Profiling
- Publisher: European Association of Geoscientists & Engineers
- Source: Conference Proceedings, 72nd EAGE Conference and Exhibition incorporating SPE EUROPEC 2010, Jun 2010, cp-161-00435
- ISBN: 978-90-73781-86-3
Abstract
To study rock physical interpretation of geophysical data for soft soil profiling, the existing rock physics models are applied to seismic velocity and resistivity data obtained for saturated and unsaturated soft soils. For unsaturated soft soils in an earthen levee, the unconsolidated sand model is applied to S-wave velocity and porosity data. The porosity is converted to resistivity for making an S-wave velocity – Resistivity diagram which is used for constructing a soil profile from S-wave velocity and resistivity profiles on the levee, proving that it can be utilized for soil classification of soft soils. For saturated soft soils, the unconsolidated sand model and the binary sand/shale mixture model are applied to P- and S-wave velocity and porosity data. This application shows that the sandy shale model of the binary sand/shale mixture model can be used for modeling soft soils composed of sands and clays, but not of gravels. The diagram of velocity and resistivity converted from porosity with the Archie’s law shows its applicability for soil classification of saturated soft soils as the case of unsaturated soft soils.