Petroleum source rock - Sekiyukongengan (English spelling) source rock of petroleum

Japanese: 石油根源岩 - せきゆこんげんがん（英語表記）source rock of petroleum

This refers to rocks that contain the source material of petroleum and are thought to be the source of petroleum. Generally, fine-grained sedimentary rocks such as black or dark gray shale, mudstone, and limestone that have not been subjected to much thermal alteration are considered to be source rocks. They are also called petroleum host rocks, but this term is not used much these days. According to organic matter analysis of source rocks, excellent source rocks are considered to be those that contain 1% or more organic carbon and 200 ppm or more petroleum hydrocarbon extracts in the case of shale and mudstone, but recently the evaluation criteria have been expanded to include those that contain 0.5% or more organic carbon and 50 ppm or more petroleum hydrocarbon extracts.

Source: Heibonsha World Encyclopedia, 2nd Edition Information

Japanese:

石油の根源物質を含み，石油がその中で生成したと考えられる岩石をいう。一般には，あまり熱変質を受けていない黒色あるいは暗灰色のケツ(頁)岩，泥岩，石灰岩などの細粒堆積岩が根源岩として考えられている。石油母岩ともいわれるが，現在ではこの用語はあまり使われていない。　根源岩の有機物分析によると，優秀な根源岩は，ケツ岩や泥岩の場合，有機炭素量1％以上で石油炭化水素抽出量200ppm以上含有する岩石とされているが，最近では，有機炭素量で0.5％以上，石油炭化水素抽出量で50ppm以上含有する岩石を良好な根源岩と評価基準を広げている。

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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