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中文摘要：
为了对鄂尔多斯盆地古生界奥陶系风化壳中天然气的主要来源进行判识，采取盆地内的低熟煤作为石炭系本溪组气源岩的未成熟样品进行了不同恒温条件下的半开放体系热解实验。实验结果表明：①在不恒温时，在每个温度点上样品没有充分反应，到更高温度点经过低温范围时样品会再次生烃，在高温度点产出的甲烷包含经历低温阶段时产生的甲烷，这与封闭实验的生烃机制类似；②恒温120min时，在每个温度点恒温时间足够长，样品充分反应，到更高温度点经过低温范围时样品不再生烃，在高温度点产出的甲烷是低温度点和高温度点之间产生的甲烷，这与开放实验的生烃机制类似；③乙烷到戊烷的产量远远小于甲烷的产量，在每一个温度点这些烃类均已生成殆尽，到下一个更高温度点经过低温范围时，其不再生成，下一高温度点得到的这些烃类只是下一个低温度点和高温度点之间的产物，这与开放体系的生烃机制类似。
英文摘要：
The low maturation coal in Shenshan Coal Mine, as the immature sample of the Carboniferous Benxi Formation, Ordos basin, is pyrolyzed under three different conditions in semi-open systems to identify the major source rocks of the natural gas in the Upper Ordovician weathered crust. We heated the sample rapidly up to a certain temperature point, and then cooled it immediately or cooled it after keeping the temperature for 120 minutes to temperatures below 100℃, separately. Then the sample was heated to higher temperatures and the procedure was repeated. The results show that the sample does not react entirely at each temperature under the first condition. Since reactants in the sample can only react partially during each heating process, the methane collected at higher temperatures is the mixture of the methane generated at lower and higher temperatures. In this case, the mechanism of the methane generation is like the hydrocarbon generation in closed systems. Under the second condition, reactants in the sample react entirely, so the methane collected at higher temperatures is generated only at the higher temperatures. The mechanism of the methane generation is like that in open systems. Under the two different isothermal conditions, the amounts of ethane, propane, butane, pentane are much less than that of methane, so their reactants have reacted entirely at each temperature. Thus, the ethane, propane, butane and pentane collected at higher temperatures are only generated at higher temperatures. The mechanism of their generation from the sample is like that in open systems.
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