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将层序地层学方法应用于岩相古地理研究中,首先建立承德地区石炭-二叠系层序地层格架,然后以四级层序为基本编图单元,编制岩相古地理图。分析了石炭-二叠系的沉积演化特征,讨论了层序地层、岩相古地理与聚煤作用的关系。在研究区识别出2个三级层序、5个四级层序、8个五级层序;揭示了海平面升降变化对成煤沼泽发育的控制,认为层序DS1的海侵或海退最大点处的四级层序Ⅲ控制了研究区两个主采煤层的发育。该结论对该区聚煤规律的研究和煤炭资源预测有一定的参考价值。
Applying the method of sequence stratigraphy to lithofacies palaeogeography, we first establish the Carboniferous-Permian sequence stratigraphic framework in Chengde area, and then we use the fourth-order sequence as basic unit to compose the paleogeographic map of lithofacies. The sedimentary evolution of Carboniferous-Permian was analyzed. The relationship between sequence stratigraphy, lithofacies palaeogeography and coal accumulation was discussed. Two third-level sequences, five fourth-level sequences and eight fifth-level sequences were identified in the study area. The control over the coal-formed marsh development by sea level fluctuation was revealed. It is believed that the sequence DS1 transgression or regression The fourth level sequence Ⅲ at the maximum point controls the development of two main coal seams in the study area. This conclusion has certain reference value to the study of coal accumulation law and coal resource prediction in this area.