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蚀变碳酸盐是烃类气体垂直运移至地表形成的一种特殊碳酸盐,只有这种碳酸盐在500℃—600℃温度区间可释放出CO_2(ΔC)。ΔC 是油气地表化探的一项重要参数。本文介绍了一种用热释和气相色谱测定ΔC 的新方法,该方法采用分道收集、单个接色谱分析,具有快速,准确的特点。
The altered carbonate is a special carbonate formed by the vertical migration of hydrocarbon gases to the surface. Only this carbonate can release CO 2 (ΔC) in the temperature range from 500 ℃ to 600 ℃. ΔC is an important parameter of oil and gas surface geochemical exploration. In this paper, a new method for the determination of ΔC by pyrolysis and gas chromatography is introduced. The method is characterized by fast and accurate analysis by lane-by-column and single-pass chromatography.