济阳坳陷上古生界天然气资源潜力评价

济阳坳陷上古生界煤系烃源岩经历多次演化和生烃，天然气资源潜力大小成为勘探方向选择的关键。通过煤系烃源岩与热演化史等综合研究，评价了济阳坳陷上古生界天然气资源潜力。结果认为：石炭-二叠系煤层属于好的烃源岩、暗色泥岩为中等烃源岩；二次生烃是其显著特征，经历印支期一次生烃、燕山期部分烃源岩二次生烃和喜山期二次生烃，喜山期二次生烃属于晚期生烃，有利于晚期成藏。坳陷内东营南坡、惠民南坡和沾化凹陷孤北地区等具有较好的二次生烃条件和较大的资源潜力，是下一步天然气勘探突破的有利区带。

Assessment of natural gas resource potential in the Upper Paleozoic of Jiyang depression

The Upper Paleozoic coal measure source rocks in the Jiyang depression have experienced multiphase evolution and hydrocarbon generation and natural gas resource potential is critical to the selection of exploration direction. The natural gas resource potential of the Upper Paleozoic in Jiyang depression was assessed through comprehensive research of coal measure source rocks and their thermal evolution history. The Permo Carboniferous coal measures are quality gas source rocks, while the dark shale is moderate. The source rocks are characterized by secondary hydrocarbon generation. Primary hydrocarbon generation occurred in the Indo Chinese Epoch, while the secondary hydrocarbon generation occurred in the Yanshan and Himalayan epochs respectively for some source rocks. The secondary hydrocarbon generation in the Himalaya Epoch features in late hydrocarbon generation, thus being favorable for late accumulation. The southern slopes of the Dongying and Huimin sags and the Gubei area of the Zhanhua sag have relatively favorable conditions for secondary hydrocarbon generation and large resource potential, thus are prospective plays for future gas exploration.