Study On Sequence Stratigraphy And Coal Accumulation Of Zheng Jialiang Exploration Area In Yushen Mining Area

This paper mainly based on the thorough collection and collation of coal resources exploration data and regional data,drilling data,various types of literature,and analyzes the characteristics of the ke,study the distribution range,thickness variation trend,occurrence regularity,analyze its depositional system,sequence stratigraphy,paleogeography,and then summarize coal accumulation.Through this research work,the main conclusions are as follows:1.The three sedimentary systems of river,lake and delta are identified in the coal formation of Zheng jialiang exploration area,including 9 subfacies and 20 microfacies.2.The Yanan group is divided into 5 sequences,12 systems tract,the sequence and evolution characteristics are summarized,and the Yanan group sequence in the study area is established.3.The sedimentary evolution of Yanan group can be divided into four stages of initial formation,lake expansion,lake atrophy and disappearance of lakes.4.Summarize three kinds of coal accumulating environment: the arm of lake peat swamp of the lake in the lake environment,the environment of the delta front distributary jianwan peat swamp,and the Delta bog peat swamp into coal.