层序地层学体系域划分的局限性——以二连盆地WL凹陷为例

LIMITATIONS OF DIVISION OF SYSTEMS TRACTS IN THE SEQUENCE STRATIGRAPHY——TAKING THE WL DEPRESSION OF THE ERLIAN BASIN FOR EXAMPLE

陆相层序地层学的一个主要内容是将三级层序划分为“低水位体系域、湖进体系域和高水位体系域”等三个水位域沉积体系 ,分别代表着一个湖盆沉积的三个阶段。低水位体系域和高水位体系域水体较浅 ,沉积较粗 ,而湖进水位域则水体较深 ,沉积较细。长期以来 ,从国外传入的三个水位域沉积体系划分成为研究陆相沉积的经典模式。以内蒙古二连盆地 WL 凹陷为例 ,指出这种模式具有一定的局限性 ,生搬套用可能产生一些错误的认识 。

One of the main contents of continental sequence stratigraphy is dividing the three-order se-quence into “LST, TST and HST”, representing three stages of a lake basin deposition. Water body is shallow and sediments are coarse in LST and HST, but in TST, being deep and fine. For a long time, the above division of systems tracts has been a classical model in the study of continental deposition. Judging from the WL Depression of the Erlian Basin, Inner Mongolia, it must be pointed out in this paper that this model has its limitations and if applied mechanically, some misunderstanding may occur and even would produce direct influence on the reliability of the research results.