哈山及周缘二叠系风城组沉积环境及沉积相发育特征

Sedimentary environment and facies of Permian Fengcheng formation in Hashan and its adjacent areas

利用岩心观察、薄片鉴定、测井识别、阴极发光等手段,确定了哈山及周缘地区二叠系风城组发育陆源碎屑岩、含灰质碎屑岩、岩盐、云质岩等。在此基础上,利用碳氧同位素、烃源岩地球化学特征、X衍射分析确定了风城组沉积时处于咸化的沉积背景下。同时,根据研究区内岩心的沉积构造等相标志特征分析,识别出风城组发育辫状河三角洲和碱性盐湖两大沉积相,且风城组从一段到三段整体反映了研究区湖水逐渐扩大再逐渐缩小的过程。

According to core observation,slice identification,logging recognition,and cathodoluminescence images,terrigenous clastic rocks,tuffaceous clastic rock,rock salt and dolomite were developed in Permian Fengcheng formation of Hashan and its adjacent areas.Besides,it′s confirmed that the Fengcheng formation was deposited in the background of the salty while analyzing the carbon and oxygen isotopes,geochemical characteristics of source rocks and mineral X-ray diffraction.On the basis of the analysis of logging data,core observation,slice identification and sedimentary structure,braided river delta and alkaline Saline Lake sedimentary systems were developed during the period of Fengcheng Formation,and the extent of the lake was gradually expanding and then shrinking from the first member to the last member of Fengcheng Formation.