Southern Kanto Gas Field - Minamikanto Gas Field

Japanese: 南関東ガス田 - みなみかんとうガスでん

Japan's largest dissolved natural gas field. It occupies an area of approximately 4,300 km2 from the northern part of the Boso Peninsula to the southern part of the Kanto Plain, with original reserves of approximately 550 billion m3. The gas layer is located in a sedimentary basin of the Kazusa Group in the marine area spanning the Pliocene Epoch of the Neogene to the Pleistocene Epoch of the Quaternary. This group consists of thin (mostly less than 1m thick) alternating layers of sand and mud, and the current gas-producing areas are the Narashino, Chiba, and Ichihara districts on the Tokyo Bay coast, the Asahi to Taito Cape districts on the Pacific coast, and the Narita, Narito, Isumi, and Kamibaku districts inland.

Source: Heibonsha World Encyclopedia, 2nd Edition Information

Japanese:

日本最大の水溶性天然ガス田。房総半島北部から関東平野南部にかけての面積約4300km2の地域を占め，原始埋蔵量は約5500億m3である。ガス層は，新第三紀鮮新世から第四紀更新世にまたがる海域の上総層群の堆積盆中にある。本層群は薄い(1m以下のものが最も多い)砂，泥互層であり，現在の産ガス地区は東京湾岸では習志野，千葉，市原地区で，太平洋岸では旭から台東岬まで，内陸では成田，成東，夷隅，上瀑地区である。

出典　株式会社平凡社世界大百科事典第２版について　情報

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