【摘要】：為了明確柴達(dá)木盆地北緣地區(qū)天然氣的成因和天然氣分布規(guī)律,綜合利用天然氣組份及碳同位素等手段對天然氣地球化學(xué)特征進(jìn)行了分析。研究表明,柴北緣天然氣以甲烷為主,重?zé)N含量相對較高,不同構(gòu)造帶天然氣組分具有明顯的差異性。碳同位素分析表明,δ~(13)C_1和δ~(13)C_2值分別介于-36.4‰~19.3‰和-27.4‰~-19.82‰。天然氣成因鑒別表明,該區(qū)天然氣主體為煤型氣,來自侏羅系烴源巖。柴北緣碳同位素分布主體為正序列特征,受不同成熟度、不同類型源巖混合以及過成熟階段源巖等因素影響,部分地區(qū)存在天然氣碳同位素倒轉(zhuǎn)現(xiàn)象。柴北緣天然氣平面分布具有分帶性,烴源巖成熟度控制了油氣分布,天然氣位于成熟-高成熟區(qū)及附近。冷湖六號-冷湖七號、鄂博梁-葫蘆山構(gòu)造帶以及阿爾金山前是下一步天然氣勘探的重點領(lǐng)域。
[Abstract]:In order to understand the origin and distribution of natural gas in the northern margin of Qaidam Basin, the geochemical characteristics of natural gas are analyzed by means of natural gas composition and carbon isotope. The results show that methane is the main natural gas and the content of heavy hydrocarbon is relatively high in the northern margin of Qaidam. The composition of natural gas in different tectonic zones is obviously different. The carbon isotope analysis shows that 未 ~ (13) C _ 1 and 未 ~ (13) C _ 2 are between -36.4 鈥，

本文編號：2341897