Sedimentary characteristics and lithofacies paleogeography evolution of Pero-carboniferous system in Jiyang depression
By using sedimentology theories and outcrops,drilling,seismic and analytical and test data,sedimentary facies and lithofacies paleogeography of Pero-carboniferous system in Jiyang depression were studied.The results show that the sedimentary structure of the research area can be classified into four sedimentary systems including lagoon-platform sedimentary system,barrier land-lagoon-tidal flat sedimentary system,shallow delta sedimentary system,fluvial-lake sedimentary system and seven sedimentary facies including lagoon,plateau,barrier land,tidal flat,shallow delta,meandering river,shallow lake.Influenced by border orogenic belt of North China plate,the paleogeography evolved from epicontinental sea onshore environment,paralic environment to continental environment.