【摘要】：基于中國(guó)祁連山凍土帶、南海北部珠江口盆地、臺(tái)西南盆地的陸坡等天然氣水合物樣品資料,進(jìn)行了天然氣水合物氣的成因類型分析。研究結(jié)果表明,祁連山木里地區(qū)中侏羅統(tǒng)江倉(cāng)組發(fā)現(xiàn)的天然氣水合物氣主要是油型氣,為自生自儲(chǔ)型,δ~(13)C_1值為-52.7‰~-35.8‰,δ~(13)C_2值為-42.3‰~-29.4‰;還發(fā)現(xiàn)了少量煤成氣,氣源巖可能主要為中侏羅統(tǒng)木里組含煤地層,δ~(13)C_1值為-35.7‰~-31.3‰,δ~(13)C_2值為-27.5‰~-25.7‰。南海珠江口盆地與臺(tái)西南盆地天然氣水合物氣主要是CO_2還原型生物氣,δ~(13)C_1值為-74.3‰~-56.7‰,δD1值為-226‰~-180‰;還發(fā)現(xiàn)熱成因氣遺跡,δ~(13)C_1值為-54.1‰~-46.2‰。綜合國(guó)內(nèi)外20個(gè)地區(qū)(盆地)相關(guān)天然氣水合物氣地球化學(xué)資料,提出世界天然氣水合物熱成因氣既有油型氣也有煤成氣,以油型氣為主,在中國(guó)祁連山和加拿大溫哥華島附近識(shí)別出了少量煤成氣,煤成氣δ~(13)C_1值重即大于等于-45‰,δ~(13)C_2值大于-28‰;油型氣δ~(13)C_1值為-53‰~-35‰,δ~(13)C_2值小于-28.5‰。世界天然氣水合物氣主要是生物成因氣,并以CO_2還原型生物氣為主,僅在俄羅斯貝加爾湖盆地發(fā)現(xiàn)乙酸發(fā)酵型生物氣。CO_2還原型生物氣δD1值重即大于等于-226‰,乙酸發(fā)酵型生物氣δD1值輕即小于-294‰。世界天然氣水合物的生物氣δ~(13)C_1值最重的為-56.7‰,最輕的為-95.5‰,其中-75‰~-60‰是高頻段。世界天然氣水合物氣δ~(13)C_1值最重為-31.3‰,最輕的為-95.5‰;δD_1值最重的為-115‰,最輕的為-305‰。
[Abstract]:Based on the samples of natural gas hydrate in the frozen soil zone of Qilian Mountain in China, the Pearl River mouth basin in the north of the South China Sea and the continental slope in the southwest basin of Taiwan, the genetic types of gas hydrate gas are analyzed. The results show that the gas hydrate gas found in Jiangchang formation of Middle Jurassic in Qilian Mountains is mainly oil-type gas, which is self-generated and self-stored. The 未 ~ (13) C _ 1 value is -52.7 鈥，

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