不同岩石中分散可溶有机质裂解成气特征
Characteristics of Cracked Gas of Soluble Organic Matter Dispersed in Different Kinds of Rocks
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摘要: 通过模拟实验，对碎屑岩和碳酸盐岩中分散可溶有机质裂解生气的模式及产物特征进行了探讨。实验表明，分散于碎屑岩与碳酸盐岩中的可溶有机质在高温热裂解演化过程中，其产气率存在着明显的差别。对于碎屑岩而言，当分散可溶有机质丰度小于0.3%时，裂解产气率与岩石中分散可溶有机质含量呈正相关关系，大于0.3%时几乎不变，而碳酸盐岩中分散可溶有机质产气率与分散可溶有机质含量的关系不是很明显。赋存于两类不同岩石中的分散可溶有机质的裂解气的及干燥系数也存在着较大差异。结果表明上述地球化学特征均与岩石对类烃气体的选择性吸附有关。Abstract: By the thermal simulating experiments, the authors researched the gas generation model of soluble organic matter which is dispersed in carbonate and clastic rocks. It indicates that the pyrolytic gas productivity of soluble organic matter dispersed in clastic rocks is obviously different from that of which in carbonate rocks during the hightemperature cracking. In clastic rocks, the cracked gas productivity is increase with the abundance of soluble organic matter when the abundance below 0.3% and almost constant when up 0.3%. In carbonate rocks, the cracked gas productivity is almost constant all along. There is a remarkable different between the dry coefficients of the pyrolytic gas from these two kinds of rocks. This is result from the difference of the rocks' selective adsorption to the heavy hydrocarbon.
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