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摘要: 对浮游藻和底栖藻进行了生烃动力学分析，结合热模拟实验和元素分析研究表明，浮游藻和底栖藻富含S、O、N等杂原子，生烃活化能普遍很低，生烃平均活化能为220 kJ/mol左右，开始生烃活化能小于184 kJ/mol，分别于251 kJ/mol和255 kJ/mol时达到90%生烃转化率，能在未熟、低熟期大量生烃。但浮游藻和底栖藻生烃过程较长，有效生烃（生烃转化率10%～90%）期间活化能跨度较大，分别为59 kJ/mol和71 kJ/mol，生烃温度跨度分别是166.8℃和201.2℃，浮游藻生烃速率快于底栖藻。浮游藻和底栖藻生烃碳转化率是61.77%和34.9%，浮游藻有更强的生烃能力，生烃产物主要是非烃和沥青质，是未熟、低熟油的重要烃源。Abstract: Hydrocarbon generation kinetics simulation was carried out to planktonnic algae and benthic algae , with the thermal simulation and element composition analysis ,the results show that planktonic algae and benthic algae are characterized by high abundance of N,S,O atoms and low hydrocarbon activation energy .Average activation energy is about 220 kJ/mol; and the activation energy of the beginning of hydrocarbon generation is less than 184 kJ/mol; the activation energy is respectively 251 kJ/mol and 255 kJ/mol to reach 90% hydrocarbon generation ratio; and generate great abundance of hydrocarbon when they are still immature. However, the period of hydrocarbon generation of planktonnic algae and benthic algae is very long ,the span of activation energy in the period of 10% to 90% kerogen transformation ratio are respectively 59 kJ/mol and 71 kJ/mol; the span of temperature are respectively 166.8 ℃and 201.2 ℃. The planktonnic algae would generate hydrocarbon much more quickly than benthic algae, the carbon conversion ratio of hydrocarbon generation of planktonic algae and benthic algae is respectively 61.77% and 34.9%.The products of hydrocarbon generation are main asphaltene and resin. Planktonnic algae and benthic algae are the main source of immature and lowmature oil.
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Key words:
- planktonic algae /
- benthic algae /
- kinetics /
- element
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