Influence of diagenesis on the electrical resistivity and the formation factor of deep-sea carbonate sediments |
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| Authors: | Dae C Kim Murli H Manghnani |
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| Institution: | (1) Mineral Physics Group, School of Ocean and Earth Science and Technology, University of Hawaii, 96822 Honolulu, Hawaii, USA;(2) Present address: Department of Applied Geologh, National Fisheries University of Pusan, 608-737 Pusan, Korea |
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| Abstract: | Laboratory measurements of electrical resistivity on two DSDP pelagic carbonate sequences permitted the study of the effect of diagenesis on the electrical and other physical properties such as velocity and porosity. Electrical resistivity and formation factor increase with sediment depth. Changes in porosity with progressive diagenesis (that is, ooze-chalk-limestone) are observed, and changes in pore geometry are inferred. These changes are interpreted in terms of systematic variations in electrical and physical properties. Influence of silica on carbonate diagenesis may result in significant change in pore geometry. This effect inhibits electrical conduction leading to complicated but generally high resistivity values for siliceous and cherty limestones. Compressional velocity correlates well with resistivity for both sequences. |
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