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根据层序地层研究 ,华北石炭二叠纪沉积建造形成于一个二级海平面变化周期内 ,其中包括 4个三级和 2 6个四级海平面变化旋回 ,而几次大的聚煤作用都发育在三级海平面下降至上升的转折时期 ,在层序地层格架中处于高位体系域的顶部。薄煤层的形成与四级海平面变化旋回相对应 ,发育于准层序的顶部。聚煤作用的发育受到海平面变化的控制 ,海平面变化提供了有机质堆积的潜在容纳空间 ,海平面升降周期的长短决定了聚煤作用持续发育的时间 ,周期性的海平面变化控制了聚煤作用的时空演化。
According to the study of sequence stratigraphy, the sedimentary formation of Carboniferous Permian in North China is formed within a period of second-level sea-level change, including four third-level and second-six sea level change cycles, and several large coal-accumulating processes During the transitional period from the decline of the third-level sea level to the rise, the development is at the top of the upper system tract in the sequence stratigraphic framework. The formation of thin coal seam corresponds to the fourth-level sea level change cycle and developed at the top of the quasi-sequence. The development of coal accumulation is controlled by sea-level change. Sea-level change provides a potential accommodation space for organic matter accumulation. The length of sea-level rise-and-fall period determines the continuous development of coal accumulation. Periodic sea-level changes control coal accumulation The role of space-time evolution.