使用同位素比值法有着一个明显的局限因素，就是要用质谱仪进行分析。
An obvious restraint in the use of isotope ratios results from the need to employ mass spectrometers.
根据甲烷碳同位素法和烃类比值法分析判断该区地表烃类异常主要由深部油气活动所产生。
The surface hydrocarbon anomalies in the area was caused by oil and gas activities in deep part, according to the analysis and judgement using the carbon isotope and hydrocarbon ratio.
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