通过对露头及钻井资料的研究,河南省晚古生代煤系可划分为1个一级层序(308-252Ma);以太原组上部灰岩段底界面为区域性沉积间断面,将该一级层序又分为Ms1和Ms2两个二级层序;进而依据次级层序界面又细分为20个三级层序。通过对本区沉积演化特征的研究表明:本溪组沉积早期,本区海侵方向为自东向西进行,海侵中心由南向北迁移,而到本溪组沉积晚期,海侵范围扩大,海侵中心部位继续北移,海侵方向由NEE向SWW进行;自太原组沉积开始,区内海侵逐渐达到高潮,海域扩大;到山西组沉积期,区内大面积海退,海域范围向东南退缩,经历了滨海一潮坪一泻湖一下三角洲平原的沉积演化;到下石盒子组至上石盒子组沉积期,海水基本退出华北盆地范围,致使河南境内沉积演化最后经历了从三角洲前缘一下三角洲平原一上三角洲平原沉积的演变过程。研究成果对分析研究区晚古生代成煤、古地理、古环境及聚煤规律具有参考价值。
On the basis of field observation in the Late Paleozoic outcrops of Henan Province, combined with de- tailed drilling information, the sequence stratigraphic framework and sedimentary evolution characteristics of the Late Paleozoic coal measures in Henan Province were studied. The results show that the Late Paleozoic coal meas- ures in the study area can be divided into one first-order sequence (308-252 Ma), and two second-order se- quences(Msb Ms2) which are divided from the bottom surface of upper limestone unit of the Early Permian Taiyuan Formation, that is the regional sedimentary discontinuous interface. And based on the sequence interface charac- teristics, it can be further subdivided into 20 third-order sequences. In the early deposit stage of Benxi Formation within the study area, the transgression direction was from east to west, the transgression center migrated from south to north. In the later deposit stage of the Benxi Formation, the deposition of the following transgression ex- panded, and the transgression center moved further northward, the transgression direction was from NEE to SWW. Since the early deposit of Taiyuan Formation, the transgression gradually reached to the highest elevation, and the sea area expanded. Until the depositional stage of the Shanxi Formation, the scope of the sea area become smaller, regression to southeast, experienced a sedimentary evolution from shore - tidal-flat - lagoon to lower delta plain. In the depositional period from the Lower Shihezi Formation to the Upper Shihezi Formation, the seawater nearly re- ceded from north China basin, so formed such a sedimentary evolution from delta-front - lower delta plain to upper delta plain in Henan province.