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| | Abstract | | Well logging was carried out at sea-floor hydrothermal deposit in Okinawa trough. The logging data analysis with core data is very useful to understand the origin of hydrothermal sulfide deposit. Natural gamma ray, resistivity, drilling fluid temperature and pressure in the borehole drilled with D/V Chikyu were measured with LWD (Logging While Drilling) in Iheya-North Knoll and Iheya Minor Ridge and memory record type logger in the Izena hole. The responses of natural gamma ray and resistivity data with correlation to the core analysis are indicate the classification of deposition, alternation, and mineralization. It is challenging to acquire continuous and good quality cores in such unconsolidated or fragile formation. Therefore, combination of continuous well logging data and core analysis allows us to make continuous depth geological profiles. The real-time monitoring in drilling fluid temperature and pressure suggest us hydrothermal distribution and activities. |
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