中-高热演化阶段煤系烃源岩生气潜力评价

Gas potential evaluation of coal measures source rock with medium-high thermal evolution stage

为了客观评价我国中-高热演化阶段煤系烃源岩生气潜力,改进我国煤系烃源岩的评价标准,基于低热演化阶段煤系烃源岩的评价标准和煤系有机质的热演化规律,提出了中-高热演化阶段煤系烃源岩(煤岩和煤系泥岩)的生气潜力评价分级标准,并据此对沁水盆地山西组煤岩和煤系泥岩的生气潜力进行了综合评价。结果表明:热演化程度是影响评价煤系烃源岩生气潜力的重要因素;沁水盆地山西组煤岩和煤系泥岩总体上具有较好的生气潜力,但盆地内不同区块具有各自差异的生气潜力,在寿阳、阳泉、榆次、平遥以及沁南等地区以较好气源岩为主。

In order to objectively evaluate the gas potential of coal measure source rock with the medium-high thermal evolution stage and improve the evaluation criteria of coal measure source rock in China, combining the evaluation criteria of coal measure source rock with low thermal evolution stage and the thermal evolution law of the organic matter of coal measures, this paper put forward the gas potential evalua- tion criteria of coal measure source rocks （coal and coal-hearing mudstone） with the medium-high thermal evolution stage. By using the criteria, the gas potential of coal and coal-bearing mudstone of the Shanxi Formation in the Qinshui Basin were also comprehensively eval- uated. The results showed that thermal evolution level was an important factor that affected the gas potential of coal measure source rock. The coal measure source rocks （ coal and coal-bearing mudstone） of Shanxi Formation in Qinshui Basin were generally better gas poten- tial, but different blocks in this basin had different gas potential. The good source rocks were mainly distributed in Shouyang, Yangquan, Yuei,Pingyao and other regions in southern Qinshui Basin.