鄂尔多斯盆地二叠系盒8段沉积特征再研究

鄂尔多斯盆地二叠系下石盒子组第8段是天然气主力产层。在众多前人研究成果的基础上，以盆地边缘露头剖面、全盆地近900口钻井数据为基础，采用古流向分析、重矿物统计分析、岩性分析、剖面结构分析等方法，对盒8段沉积相类型及特征进行了研究，重新确立了盒8段的沉积特征和河流相沉积模式。结果表明：盒8段沉积时受南北2个古陆所发育的冲积水系控制，发育河流相沉积，河流南北沟通，并向东流入湖泊。该汇水湖泊位于山西多宁－河津－韩城以东的地区，并非位于鄂尔多斯盆地境内。

Research on sedimentary environment of the Member 8 of Middle Permian Xiashihezi Formation in Ordos Basin,China

The Member 8 of Middle Permian Xiashihezi Formation (He-8)in Ordos Basin is the main natural gas producing reservoir.Based on approximate 900 drilling wells data and some outcrop sections from the basin margin,combined the methods of paleocurrent direction analysis,heavy mineral statistical analysis, lithology analysis, and section structure analysis, the intrinsic characteristics of old lands,paleocurrents and deposits with respect to the strata of the Member 8 of Xiashihezi Formation were analyzed.The study results in new sedimentary features and sedimentary patterns in the area.It reveals that the sedimentary stage of the section 8 of Xiashihezi Formation is controlled by two oldlands in the north and the south respectively and the rivers originated in the north and the south are connected at that stage.The catchment area occurs in east of Duoning,Hejing and Hancheng of Shanxi Province,instead of in the Ordos Basin.