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以生烃动力学方法对煤的生烃潜力进行定量评价是近些年发展起来的一种新方法.文中通过对煤岩在高温高压封闭体系条件下的热模拟实验,取得了热解产物烃类气体组分的动力学参数,应用这些参数对沁水盆地上古生界煤生烃动力学特征和生烃史进行了研究.结果表明,T末到J2末期间,地质时间相对较长,古地温较低,使沁水盆地煤层甲烷产率增长比较缓慢,煤的产烃能力较弱;而J3到K1期间,地质时间持续相对较短,但是古地温较高,这一阶段的甲烷产率增长最快,煤岩产烃能力较强.模拟和实测资料对比表明,根据甲烷和C2~C4生成史所计算的干燥系数为判识沁水盆地不同研究地区煤层气成因提供了证据;首次对成煤物质泥炭进行了生气动力学实验模拟,并将模拟结果应用于沁水盆地的古地温演化史中,与煤岩的生烃动力学特征进行了对比,表明了泥炭比煤岩具有更高的生气能力;具有较高演化程度的煤岩样品的化学动力学模拟实验结果不能完全恢复该煤岩的生烃能力,会导致煤层气资源量评价结果偏小;用泥炭生烃的动力学模拟结果进行煤层气生成量预测,估算了研究地区的煤层气生成量的上限.对研究地区不同煤层的煤层气生成量范围的计算结果显示,所研究的阳城地区太原组和山西组煤层气生成量最高,是最有利的煤层气形成地区之一;沁源地区太原组和山西组煤层气生成量也较高,是比较有利于形成煤层气的地区;霍山地区煤层气的生成量最小,煤层气形成条件最差.
Hydrocarbon production kinetic method to quantitatively evaluate the hydrocarbon potential of coal is a new method developed in recent years.Through the thermal simulation of coal and rock under the conditions of high temperature and high pressure closed system, Based on the kinetic parameters of gas components, the kinetic characteristics and hydrocarbon generation history of coal in the Upper Paleozoic of Qinshui Basin were studied using these parameters. The results show that the geologic time is relatively long from the end of T to the end of J2, The lower ground temperature leads to a slower increase of methane yield in the coal seam of Qinshui Basin and a weak hydrocarbon production capacity. During J3 to K1, the geological time lasted relatively short, but the paleotemperature was high. The methane yield in this phase The fastest growth and strong hydrocarbon production capacity of coal.Comparison between simulated and measured data shows that the drying coefficient calculated according to the generation history of methane and C2 ~ C4 provides evidence for the formation of CBM in different research areas of Qinshui Basin. The peat has been experimentally simulated by aerodynamics, and the simulation results have been applied to the paleogeothermal evolution history of Qinshui Basin, which is in contrast with the hydrocarbon generation kinetic characteristics of coal and rock, indicating that peat has higher content than coal and rock Health The results of chemical kinetics simulation of coal samples with higher evolution can not fully recover the hydrocarbon generation ability of coal and rock, which leads to the small evaluation result of coalbed methane resources. The kinetic simulation results of peat hydrocarbon generation CBM generation amount is estimated and the upper bound of CBM production in the study area is estimated.Calculation of the range of CBM generation in different coal seams in the study area shows that the highest CBM generation in the Taiyuan and Shanxi groups , Which is one of the most favorable CBM formation areas. The Taiyuan Formation and Shanxi Formation in the Qinyuan area also have higher CBM generation rates, which is more favorable for the formation of CBM areas. The formation of CBM in Huoshan area is the smallest and formation of CBM The worst conditions.