FY2003 METI Exploratory Test Wells "Tokai-oki to Kumano-nada" were drilled to clarify the occurrences of methane hydrate (MH) in the eastern Nankai Trough. LWD (logging-while-drilling) , wireline logging, and corings were conducted for thirty-two wells at sixteen locations. Experimental wells were drilled to establish the technology of well completion for the future development of MH (Matsuzawa et al., p.854-871 in this journal). Pore-filling MHs in sandy sediments, which have development potential, were identified by this drilling survey. Based on the results, the volume of MH resources in the eastern Nankai Trough was calculated.

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