Abstract: The anaerobic fermentation method which was used in appraisement of biogenic gas resource failed to reflect or describe the gas generation period.In consideration of this tough problem,the biochemical kinetic model of biogenic gas generated from organic matter was established according to the biochemical kinetic theory.The kinetic parameters were calibrated by the data of simulation experiment. In consideration of the influences of the bacterium concentration and temperature on the kinetic parameters,the biochemical kinetic model with the kinetic parameters was applied in Qaidam Basin.The result shows that the biogenic gas generation rate increases with the buried depth firstly and then decreases when the rate reaches to the maximum corresponding to the buried depth of 600m.This conclusion is similar to the previous studied result,which shows that this model under consideration of the influences of bacterium concentration and temperature on the kinetic parameters can be used to appraise the biogenic gas generation period.

Key words: organic matters, biogenic gas, biochemical kinetic model, gas generation period appraisal, gas generation rate, kinetics parameter, Qaidam Basin

摘要： 国内外评价生物气资源量普遍采用微生物厌氧发酵法,该方法不能反映生气期,为此,依据生化动力学,建立了有机质生成生物气的生化动力学模型,并结合实验条件下生物气产率,标定了生化动力学参数。在此基础上,考虑菌体浓度和温度对动力学参数的影响,将所标定的动力学参数在柴达木盆地进行应用的结果表明,柴达木盆地生物气生成速率随埋深先增大后减小,速率最大值对应的深度约为600m,与前人研究结论相近。这说明根据实验室产气率数据标定所建立的动力学模型在考虑菌体浓度和温度对动力学参数影响的条件下可以用来定量评价生物气生成期。

关键词: 有机质, 生物气, 生化动力学模型, 生气期评价, 生气速率, 动力学参数, 柴达木盆地