天然气地球科学 ›› 2020, Vol. 31 ›› Issue (11): 15851592.doi: 10.11764/j.issn.1672-1926.2020.03.014
Xiao-bao ZHANG1,2,3(),Fei ZHOU3,Zhan-yuan CAO1,2,3,Ming-liang LIANG4
摘要:
为进一步明确柴达木盆地氦气资源分布情况,对东坪等气田天然气地球化学特征进行分析。结果表明:东坪气田东坪1井区、东坪3井区和尖顶山气田尖探1井区等21个天然气样中氦气含量大于0.05%,达到了工业标准,其中最小值为0.075%,最大值为1.069%,平均值为0.386%,据此在柴达木盆地首次发现了东坪氦工业气田。东坪气田及其附近的牛东气田3He/4He最小值为1.01×10-8,最大值为3.62×10-8,平均值为1.86×10-8,均位于10-8量级,应属壳源氦。综合分析认为东坪、尖顶山等气田已发现氦工业气藏的氦主要来源于花岗岩或花岗片麻岩基底。柴达木盆地花岗岩与花岗片麻岩基底分布广泛,具备形成高含氦天然气的条件,氦资源勘探前景十分广阔。
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