【摘要】：天然氣來(lái)源分析是一個(gè)重要的石油地質(zhì)問(wèn)題,直接關(guān)系到勘探?jīng)Q策。四川盆地川東地區(qū)須家河組勘探和開發(fā)相對(duì)滯后,基礎(chǔ)地質(zhì)研究的欠缺導(dǎo)致臥新雙地區(qū)須家河組天然氣的來(lái)源一直存在爭(zhēng)議。天然氣組分及碳同位素分析結(jié)果表明:臥新雙地區(qū)須家河組天然氣具有甲烷含量較低、重?zé)N含量較高、干燥系數(shù)較低等特點(diǎn);天然氣中甲烷碳同位素值δ~(13)C_1-40‰,具有δ~(13)C_3δ~(13)C_2δ~(13)C_1的特征;須家河組天然氣為干酪根初次裂解的陸相油型氣和混合氣;須家河組天然氣目前主要處于成熟-高成熟的濕氣階段。臥新雙地區(qū)須家河組暗色泥巖較為發(fā)育,有機(jī)地球化學(xué)分析結(jié)果表明:須家河組泥巖主要以Ⅱ1和Ⅱ2型干酪根為主,具有較高的有機(jī)碳含量和氯仿瀝青"A"含量,總體具有較好的生烴能力,泥巖中有機(jī)質(zhì)處于成熟-高成熟的濕氣階段。臥新雙地區(qū)須家河組天然氣成熟度與烴源巖成熟度相當(dāng),結(jié)合須家河組天然氣組分特征、同位素特征及成因類型等與下伏石炭系、茅口組、龍?zhí)督M、長(zhǎng)興組、飛仙關(guān)組、嘉陵江組及雷口坡組天然氣存在明顯區(qū)別,推測(cè)該區(qū)須家河組天然氣主要為自生氣。
[Abstract]:Natural gas source analysis is an important petroleum geological problem, which is directly related to exploration decision. The exploration and development of Xujiahe formation in East Sichuan Basin is relatively lagging behind, and the lack of basic geological research has led to the controversy over the source of natural gas of Xujiahe formation in Huxinshuang area. The results of natural gas composition and carbon isotope analysis show that the natural gas of Xujiahe formation in Huxinshuang area has the characteristics of lower methane content, higher heavy hydrocarbon content and lower drying coefficient, and the methane carbon isotope value 未 ~ (13) C ~ (1-40 鈥，

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