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对云南若干中、小盆地 (陆良、杨林、保山及景谷 )第三系生物气及未 低熟油伴生气进行了研究 .生物气组分以甲烷为主 ,在烃气中 >99% .同位素组成轻 ,δ13 C1为 - 6 0 0‰～- 75 4‰ ,其中保山盆地相对较重 ( - 6 0‰～ - 6 5‰ ) ,陆良及杨林盆地较轻 ,δ13 C1均小于- 70‰ ,比较而言 ,可能意味保山生物气藏成藏时间较早 .景谷盆地原油为未 低熟原油 ,其伴生气具有相对高的湿度 ,烃气中甲烷相对含量为 5 8%～ 95 % ,就组分而言与正常石油伴生气相似 ,但其甲烷碳同位素值为 - 5 3 8‰～ - 5 7 8‰ ,明显较一般油田伴生气相对富集12 C ,具有与生物 热催化过渡带气相似的特征 .乙烷碳同位素在 - 34 6‰～ - 2 9 ‰之间 ,其源岩应为油源岩 ,但对低演化阶段石油伴生气而言 ,其组成偏重 ,同时 ,乙、丙、丁烷之间有同位素组成倒转现象 ,也许暗示着存在Ⅲ型有机质成气的贡献 ,δ13 CCO2 基本小于 - 1 0‰ ,应是有机成因产物
The third-generation biogas and associated low-mature oil were studied in a number of middle- and small-scale basins (Luliang, Yanglin, Baoshan and Jinggu) in Yunnan Province.Methane is the main component of biogas, and is more than 99% The isotopic compositions are light and δ13C1 is -600 ‰ to 754 ‰, of which Baoshan basin is relatively heavy (-600 ‰ -6.5 ‰), while Luliang and Yanglin basins are lighter and δ13C1 is less than - 70 ‰, which may indicate that the gas accumulation time of Baoshan bio-gas reservoir was earlier than that of the previous period. The crude oil in Jinggu basin is low-mature crude oil with relatively high relative humidity. The relative content of methane in hydrocarbon gas is 58% -95% % Is similar to normal petroleum associated gas in terms of composition but has a methane carbon isotope value of -538 to-578 ‰, which is significantly enriched in 12 C relative to the associated gas in common oilfields, The carbon isotope of ethane is between -34 6 ‰ and -29 ‰, and the source rock should be oil source rock, but its composition is too heavy for the accompanying oil with low evolution stage. At the same time, B, C, butane isotopic inversion between the phenomenon may indicate the presence of type III organic matter into the gas, δ13 CCO2 basic less than - 1 0 ‰, should be organic products