【摘要】：為探明川中地區(qū)須家河組天然氣特征、成因及來(lái)源,對(duì)該區(qū)須家河組天然氣組分及碳、氫同位素特征進(jìn)行了分析。結(jié)果表明:川中地區(qū)須家河組天然氣以甲烷為主,除元壩、通南巴等地區(qū)外,主體表現(xiàn)為濕氣特征,干燥系數(shù)小于0.95,天然氣干燥系數(shù)主要受烴源巖成熟度的控制。δ~(13)C_1值介于-43.8‰~-29.3‰之間,δ~(13)C_2值介于-35.4‰~-24.3‰之間,δD_(CH_4)值介于-179‰~-152‰之間。天然氣成因鑒別及氣源對(duì)比結(jié)果表明:川中地區(qū)大部分氣田須家河組天然氣為煤成氣,來(lái)源于須家河組煤系烴源巖。川中地區(qū)大部分區(qū)域僅少數(shù)天然氣樣品發(fā)生丙烷、丁烷的碳同位素部分倒轉(zhuǎn),主要由同源不同期氣的混合所致。
[Abstract]:In order to find out the characteristics, origin and source of natural gas in Xujiahe formation in central Sichuan, the composition, carbon and hydrogen isotopic characteristics of natural gas in Xujiahe formation are analyzed. The results show that the main natural gas of Xujiahe formation in central Sichuan is methane, except Yuanba and Tongnanba, the main body is wet gas. The drying coefficient is less than 0.95, and the drying coefficient of natural gas is mainly controlled by the maturity of source rocks. The 未 ~ (13) C _ (1) C _ (1) is between -43.8 鈥，

本文編號(hào)：2226705