Diamondoid Hydrocarbon Ratios as Indicators of Maturity in Natural Gas
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摘要: 采用天然气重烃富集及MID/GC/MS分析技术,从天然气中检测出单、双金刚烷类化合物。根据琼东南盆地生油岩中金刚烷指标 (Ⅱ )与镜煤反射率 (Ro)的实测值,结合应用塔里木盆地、鄂尔多斯盆地的上述实测数据点,建立了双金刚烷指标与镜煤反射率 (Ro)数值对应关系。根据这种关系成功地确定和研究了莺—琼盆地三个构造天然气的成熟度。研究成果不仅提供了检测天然气中金刚烷类化合物的方法,扩大了金刚烷类化合物的应用范围,而且表明金刚烷类化合物是研究天然气成熟度的一个有效指标Abstract: Diamondoid hvdrocarhons have been identified in heavy hvdrocarhons collected from gas samples in Yinggehai and Qiongdongnan basins by MID/GC/MS method.The empirical relationship between methyl diamantane ratio and the corresponding vitrinite reflectance value has been established based on our data and data after Chen, 1996.This empirical relationship has been used to evaluate the maturity of gases from three gasfields in Yinggehai and Qiongdongnan basins.Based on this study gases from Yinggehai and Qiongdongnan basins are generally believed to he highly mature(Ra>1.5%),the recult is in accordance with other studies.So, methyl diamantane index is an effective parameter to evaluate the maturity of gas.Our work not only provides the method to identify the diamondoids in gas, but also extends the application of diamondoids.The study of hiomarkers and maturity of gases have very important rules for explaining some debatable questions such as the formation of gas reservoir and gas source rock in Ya13-1 gasfield.
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Key words:
- natural gas /
- MID/ GC/MS /
- diamondoids /
- maturity of gas /
- Ying-Oiong basin /
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