晋北晚古生代高分辨率含煤层序

High-resolution Coal-bearing Sequence of Late Paleozoic Strata in Datong Region,North Shanxi

本文介绍了以基准面升降为驱动机制的高分辨率层序地层学的理论和方法。此方法是在沉积相分析的基础上，通过沉积体积划分和相分异反演出可容纳空间的单向迁移方向、地层叠置样式、基准面升降及界面位置，进而划分出不同级次的基准面旋回（即层序），并由长期旋回到短期旋回逐级进行对比。此后，作者用该法对以陆相沉积为主的山西大同晚古生代煤系进行详细划分对比，澄清了过去某些模糊认识，探讨了聚煤作用与高分辨率层序的关系。研究结果表明，该方法能极大地提高地层划分与对比精度，是陆相层序地层研究的有效方法。

The paper introduces the theory and method of high-resolution sequence stratigraphy based on the control of baselevel rise and fall.On the basis of facies analysis the method is used to deduce a single direction of accommodation migration,stacking patterns of strata,baselevel rise ,and fall and surface location of sequences by volumetric partition of sediment and facies differentiation,and to divide various orders of baselevel cycles(i.e. sequences)and to correlate the cycles order by order from long-term cycles to short-term ones.After that,the authors apply the method for detail division and correlation of Late Paleozoic coal bearing series mainly composed of continental sediments in the Datong region ,North Shanxi,and clarify some vague conclusions and searches for the relationship between coal accumulation and high-resolution sequence.The result of the study indicates that the method can be widely used to improve the precision of division and correlation of strata,and that it is an effective way to research into continental sequence stratigraphy.In addition,this approa his also very useful in correlation and predication of reservoirs.