Exploration Seismology in Japan ~100 years of progress~

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  • OHTA Yoichi
    Former Senior Executive Director, Japan Petroleum Exploration Co., Ltd.(JAPEX). Former President, JGI Inc.

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  • 日本の地震探査100年の歩み
  • ニホン ノ ジシン タンサ 100ネン ノ アユミ

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Abstract

<p>The first seismic survey for oil exploration in Japan was conducted by a Japanese oil company at Futsudo area located in north-western part of Akita prefecture in 1940. The results reported by Y.Ishida(1943) were briefly reviewed, and the seismic profile of the recent 3D survey acquired in 1985 was reviewed for comparison. Since then, the exploration seismology in Japan has been developing for more than 80 years, and the policy of Japanese government for oil and gas exploration has an important effect upon the development of the survey equipment and software. After the Pacific War (1941-1945), in order to promote the exploration of the domestic oil, the GHQ had been supporting the Japanese oil company for a decade to install the modern seismic instruments. The national project (the first 5-year plan discussed and determined in the governmental committee) for the purpose of exploration and production of domestic oil fields started in 1950, and the project had continued for 45 years, up to 8-th 5-year plan (1995 to 2000). The development of the field data acquisition and processing/analysis system had been motivated by the change of the exploration target (shallow complex structure to deeper structure, continental shelf to deep sea on offshore area, shallow water and transition area, structural trap to stratigraphic trap, etc.). Especially, the digital recording system, developed in 1960's and combined with the digital telemetry system in 1970's, made it possible to acquire the large volume of data more than 1000 channel, which enabled to acquire large spread data and 3D data.</p><p>The reflection seismology, developed as a major tool for exploration of oil and gas resources that produce economic value, has been applied to other fields such as earthquake disaster prevention/mitigation, CO2 underground storage, etc. The effort to find and promote the new application fields will be required for further expansion of the technology.</p>

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