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山东地区经历了多次构造运动 ,含煤地层遭受严重破坏 ,因此各地煤系保存程度差异较大。济阳坳陷是石炭—二叠系的深陷区 ,但济阳坳陷构造十分复杂 ,煤系保存于坳陷中的一些次级凹陷中。石炭二叠系的埋深多在 30 0 0～ 5 0 0 0m范围内 ,次级凹陷局部出现较大的埋深变化 ,最大埋深可达上万米 ,最小埋深仅在千米左右。煤型气源岩主要为煤层和暗色泥质岩。泥质岩最厚为 5 5 5 .5m(惠民凹陷 ) ,煤层最厚 4 0 .5m(车镇凹陷 ) ,泥岩、煤层厚度分布与残留厚度的变化趋势大体一致。研究表明 ,济阳坳陷石炭二叠系煤层属较好的烃源岩 ,泥岩整体上为差—中等烃源岩 ,局部发育有好的烃源岩。
The Shandong area experienced many tectonic movements, and the coal-bearing strata suffered serious damage. As a result, there was a big difference in the preservation degree of coal measures in various places. The Jiyang Depression is a Carboniferous-Permian deep depression. However, the structure of the Jiyang Depression is very complicated and the coal measures are preserved in some secondary depressions in the depression. The depth of Permian in the Permian is mostly in the range of 30 000 ~ 500 000 m. The depth of partial subsidence changes greatly, and the maximum depth can reach tens of thousands of meters with the minimum depth of only about one kilometer. Coal type gas source rock is mainly coal seam and dark mudstone. The maximum thickness of mudstone is 555.5m (Huimin Depression), the thickness of the coal seam is 400m (Chezhen Sag), mudstone and coal seam, and the distribution trend of thickness is consistent with that of residual thickness. The research shows that the Permo - Carboniferous coal seam in Jiyang Depression is a good source rock, and the mudstone is generally poor - moderate source rock, with good source rocks locally developed.