中文摘要：

通过对塔里木盆地煤及其显微组分以1K/min升温速率在开放体系下进行热模拟实验（Tmax=1200℃），确定了CH4与N2生成动力学参数。根据化学反应动力学原理，当煤岩生成CH4和N2为25个一级平行反应且具有相同频率因子（Ao=1.0×10^13s^-1）时，生成CH4与N2每个反应对应的活化能可以通过实验数据与理论计算拟合，获得Gaussian型活化能分布特征为：CH4在活化能为42～90kcal/mol内，煤、镜质组、壳质组、丝质组和半丝质组生成CH4的主频活化能分别为60、52、50、70和66kcal/mol；N2在活化能为60～108kcal/mol内，其主频活化能分别为74、108、100、108和102kcal/mol。根据这些实验动力学参数，推测了煤岩在地质升温速率为5.3K/Ma时CH4的转化率：CH4在地质温度为20℃时开始形成；当地质温度为160℃时，煤岩中CH4已生成总量的80%。镜质组和壳质组CH4转化率要高于煤岩。

英文摘要：

Open system non-isothermal pyrolysis experiments at a heating rate of 1 K/min were performed on immature coal samples （Ro = 0. 4%） from the Tarim Basin, NW China, and on their isolated macerals （vitrinite, exinite, fusinite and semi-fusinite） in order to determine the kinetics of gas generation （CH4 and N2 ）. Assuming that the generation rate of CH4 and N2 was described by 25 single first-order reactions with a single pre-exponential （Ao= 1.0× 10^13 s^-1 ）, a discrete distribution of activation energies was computed by data processing for CH4 and N2. When the activation energies were distributed between 42 and 90 kcal/mol, a model occurred with the dominent activation energy of 60, 52, 50, 70, and 66 kcal/mol for CH4 from coal, vitrinite, exinite, fusinite and semi-fusinite, respectively; the dominant activation energy for N2 was 74, 108, 100, 108 and 102 kcal/mol respectively when the activation energies were in the range of 60-108 kcal/mol. Based on the kinetic parameters derived from laboratory experiments, CH4 transformation ratios were calculated for geological heating rate of 5.3 K/Ma. Gas containing more temperatures in excess of 160 ℃ from coal, whereas than 80% of CH4 was formed under these conditions at the percentage of methane generation from vitrinite and exinite was higher than that from coal.