Diamondoid Hydrocarbon Ratios as Indicators of Maturity in Natural Gas

FU Ning; LI You chuan

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(R_a>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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References

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Diamondoid Hydrocarbon Ratios as Indicators of Maturity in Natural Gas

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通讯作者: 陈斌, bchen63@163.com

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