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分析塔里木盆地海相天然气碳同位素组成 ,发现天然气的乙烷碳同位素值域分布范围较大 ( - 43‰～- 2 9‰ ) ,并且具有很强的母质继承性。据此并结合天然气甲烷碳同位素组成变化特征 ,将该盆地海相天然气分成 4类。第一类 :δ13 C1值小于 - 40‰ ,δ13 C2 值小于 - 3 7‰ ,主要来源于寒武系—下奥陶统腐泥型母质 ,分布于塔中主垒带、英买力和东河塘地区 ;第二类 :δ13C1值小于 - 40‰ ,δ13 C2 值大于 - 3 4‰ ,主要来源于中、上奥陶统偏腐殖型母质 ,分布于塔中北斜坡、巴楚、东河塘及雅克拉等地区 ;第三类 :δ13 C1值大于 - 40‰ ,δ13 C2 值为 - 3 9‰～ - 3 5‰ ,主要来源于寒武系—下奥陶统腐泥型母质 ,并受热成熟作用影响 ,主要分布在轮南—吉拉克地区 ;第四类 :δ13 C1值大于 - 40‰ ,δ13 C2值大于 - 3 5‰ ,主要来源于寒武系—下奥陶统腐泥型母质 ,同时混入有中、上奥陶统或石炭系偏腐殖型母质生成的气 ,主要分布于桑塔木断垒带及解放渠东—吉拉克地区。图 1表 3参 4(梁大新摘 )
Analyzing the carbon isotopic compositions of marine natural gas in the Tarim Basin, it was found that the distribution range of natural gas is wide (-43 ‰ ~ -29 ‰) and has strong parental inheritance. Based on this, combined with the variation of carbon isotope composition of natural gas methane, the marine natural gas in the basin is divided into four categories. The first category: δ13C1 value less than - 40 ‰, δ13C2 value less than - 3 7 ‰, mainly from the Cambrian - the Lower Ordovician sapropelic parent material, located in the tower of the main base, the British Buying force and East Hetang area; the second type: the δ13C1 value is less than -40 ‰ and the δ13C2 value is greater than -3 4 ‰, mainly from the middle and upper Ordovician partial humic parent materials distributed in the northern slope of Tazhong, Bachu and East Hetang and Yakela and so on. The third category is that the δ13C1 value is greater than -40 ‰ and the δ13C2 value is -3.9 ‰ -3.5 ‰ mainly from the Cambrian-Lower Ordovician sapropelic parent material, Which is mainly distributed in the Lunnan-Jilak region. The fourth category: δ13C1 values greater than -40 ‰ and δ13C2 values greater than -3.5 ‰, mainly derived from the Cambrian-Lower Ordovician sapropel mud Type parent material, while mixed with gas generated by the Middle, Upper Ordovician or Carboniferous partial humus parent materials, mainly distributed in the sagamu fault zone and Jiefang Canal East - Ji La Ke area. Figure 1 Table 3 Reference 4 (Liang Daxin Abstract)