Data Acquisition of Logging While Drilling at the Newly Discovered Gas Hydrate Reservoir in Hyuganada Sea, Japan

Toshinori Imai (), Than Tin Aung, Akira Fujimoto, Satoshi Ohtsuki, Kotaro Tano, Shuhei Otomo, Naoyuki Shimoda, Takanao Yoshii, Ryugen Sakata, Jun Yoneda and Kiyofumi Suzuki
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Toshinori Imai: Japan Organization for Metals and Energy Security, Chiba-shi 261-0025, Chiba, Japan
Than Tin Aung: Japan Organization for Metals and Energy Security, Chiba-shi 261-0025, Chiba, Japan
Akira Fujimoto: Japan Organization for Metals and Energy Security, Chiba-shi 261-0025, Chiba, Japan
Satoshi Ohtsuki: Japan Organization for Metals and Energy Security, Chiba-shi 261-0025, Chiba, Japan
Kotaro Tano: Japan Organization for Metals and Energy Security, Chiba-shi 261-0025, Chiba, Japan
Shuhei Otomo: Japan Organization for Metals and Energy Security, Chiba-shi 261-0025, Chiba, Japan
Naoyuki Shimoda: Japan Organization for Metals and Energy Security, Chiba-shi 261-0025, Chiba, Japan
Takanao Yoshii: Japan Methane Hydrate Operating Co., Ltd., Chiyoda-ku, Tokyo 100-0005, Japan
Ryugen Sakata: Japan Methane Hydrate Operating Co., Ltd., Chiyoda-ku, Tokyo 100-0005, Japan
Jun Yoneda: National Institute of Advanced Industrial Science and Technology, Sapporo 062-8517, Hokkaido, Japan
Kiyofumi Suzuki: National Institute of Advanced Industrial Science and Technology, Tsukuba 305-8560, Ibaraki, Japan

Energies, 2024, vol. 17, issue 15, 1-15

Abstract: From December 2021 to January 2022, MH21-S conducted an exploratory drilling campaign using logging-while-drilling tools to confirm the methane hydrate concentrated zone (MHCZ) for future offshore production tests. In a preliminary screening study using seismic survey data, methane hydrate (MH) prospects have been extracted in The Hyuganada Sea, offshore Kyushu. In the exploration drilling site, a previous study had reported that MH prospects were inferred from four indices. We have selected two MH prospects: one with an anticlinal structure and another with a planus structure. As a result of drilling, a resistivity value higher than 3 Ω·m, which was a criterion for interpreting MHCZs from log data, was confirmed at a depth of 336–376 mBSF in the prospect with an anticlinal structure. The MH saturation calculated using Archie’s formula was 12–95% (average saturation of 70%). The average density porosity at the same depth was 52%. P-wave velocities were faster than the upper layers. Compared with those of the MHCZ at Daini Atsumi Knoll, the MH saturation is expected to be higher, the spread of some strong-amplitude reflectors has been interpreted from seismic survey data, and the potential MH resources in this area can be sufficiently expected.

Keywords: logging while drilling; gas hydrate; Archie’s analysis; gas hydrate saturation (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2024
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