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采用理论分析、数值模拟和实验室试验验证的方法,以岩浆作为侵入时期煤变质的主要热源,构建了岩浆侵入煤系地层后热传导作用的数学模型,结合研究区域煤样的多元物性参数测定结果,深入探讨了侵入岩浆对下伏煤层的热变质作用,揭示了海孜井田下伏煤层的演化生烃过程.结果表明:岩浆对围岩的高温作用持续时间相对比较短暂,随着侵入岩浆岩体厚度的增大,相同距离的围岩体在同一时刻达到的温度和最终达到的最高温度均增加,但达到最高温度的时间被延后.高温侵入岩浆冷却过程较低温侵入岩浆的冷却过程持续时间长,热影响范围大,且热力影响区域内同一点达到的最高温度也比低温侵入岩浆在该点产生的最高温度高.随着距岩浆岩距离的增加,煤层的最高有效温度和持续高温作用时间减少.海孜井田岩浆岩下伏煤层受岩浆热演化作用发生二次生烃,煤层变质程度显著增加,产烃量约为340 m~3/t.
Using the method of theoretical analysis, numerical simulation and laboratory test, taking the magma as the main source of coal metamorphism during the invasion, a mathematical model of the thermal conductivity after formation of magma intruded into coal strata is established. Combining the results of multivariate physical parameters of the coal samples in the study area , In-depth discussion on the thermal metamorphism of the underlying coal seam by intrusive magma and reveal the evolution and hydrocarbon generation process of the underlying coal seam in Haizi Minefield.The results show that the duration of the high temperature of magma to surrounding rock is relatively short, and with the invasion of magmatic rocks The increase of body thickness and the temperature reached by the surrounding rock body at the same distance at the same time and the maximum temperature finally reached increase, but the time to reach the maximum temperature is prolonged.The cooling process of intrusion into magma at low temperature during the process of high temperature intrusion magma cooling continues Long time and large heat affected zone, and the highest temperature reached by the same point in the heat affected zone is also higher than the highest temperature at low temperature intruded magma.With the distance from the magmatic rocks increasing, the maximum effective temperature and sustained high temperature The action time decreases.The coal seam under the magmatic rocks in Haizi Minefield is subjected to secondary hydrocarbon generation due to thermal evolution of the magma, Significantly increased level of quality, yield of hydrocarbon is about 340 m ~ 3 / t.