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柴达木盆地中广泛分布的第三系能否生成生物气并构成商业气田的问题一直悬而未决。2001年6月20日,在柴达木盆地伊深1井1319.0～1322.5m第三系首次发现了天然气商业气藏。经分析,该井天然气烃类气体中以甲烷占绝对优势,为98.01％;重烃含量极低,仅为0.17％;C1/C1-5高达0.998;δ13C1非常轻,为-67.3‰,是典型生物气的特征。天然气40Ar/36Ar为318.0,说明其气源岩年代较新,可能为第三纪或第四纪。结合天然气地质条件认为,该井天然气应为第三系自生自储的生物气。这一认识对进一步深入探讨柴达木盆地生物气形成机制和成藏规律,扩大天然气资源量,拓展天然气勘探新领域具有重要意义。图1表2参11（张晓宝摘）
The widespread availability of tertiary gas in the Qaidam Basin to form biogas and to form commercial gas fields remains unresolved. On June 20, 2001, a natural gas commercial gas reservoir was first discovered in the 1319.0 ~ 1322.5 m Tertiary of the Well I-1 in the Qaidam Basin. According to the analysis, methane is the dominant hydrocarbon gas in this well, accounting for 98.01%; the heavy hydrocarbon content is very low, only 0.17%; the C1 / C1-5 is as high as 0.998; the δ13C1 is very light, which is -67.3 ‰, Biogas characteristics. The natural gas 40Ar / 36Ar is 318.0, indicating that the gas source rocks are relatively new in age and may be Tertiary or Quaternary. According to the geological conditions of natural gas, it is considered that natural gas of this well should be biogas from Tertiary self-generative and self-storage. This understanding is of great significance for further exploration of biogas formation mechanism and accumulation pattern in the Qaidam Basin, expansion of natural gas resources and exploration of new areas for natural gas exploration. Figure 1 Table 2 Senate 11 (Zhang Xiaobao pick)