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Multi-Stage Exploration for SMSs using High-Resolution Seismic Systems
- Publisher: European Association of Geoscientists & Engineers
- Source: Conference Proceedings, EAGE-HAGI 1st Asia Pacific Meeting on Near Surface Geoscience and Engineering, Apr 2018, Volume 2018, p.1 - 5
Abstract
Summary
The Multi-Stage Exploration is our proposed reflection seismic methods for SMS deposits. This investigation method consists of VCS (Vertical Cable Seismic) and ACS (Autonomous Cable Seismic) which we have proposed so far and ZVCS (Zero-offset Vertical Cable Seismic) which was first conducted in this research. ZVCS is a deep-tow exploration system using an upstanding cable. It is possible to easily separate and extract only a reflection wave from just below the ZVCS by vertically arranged hydro-phones.
In 2016, we carried out a Multi-Stage Exploration in the Izena Hole, which is one of the most promising hydrothermal sulfide ore deposits area around Japan. The purpose of this study is to understand the characteristic seismic facies of hydrothermal field and to show that the SMS deposit can be detected by this method.
The result of these high-resolution survey shows the follows: First, the lower boundary of the massive sulfide in the sedimentary layer can be identified by negative-polarity reflections. Second, a strong hydrothermal alteration zone can be identified as a low amplitude area. Third, massive sulfide deposits in hydrothermal activity area can be identified by velocity model and characteristic seismic facies.
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