According to the petrographic analysis、hydrodynamic analysis、fluvial sedimentary structure and trace fossils,this paper restores the hydrodynamic intensity、depth of fluvial channels etc and analyses the fluvial sedimentary facies and fluvial evolution in Middle Triassic Youfangzhuang Formation of Jiyuan Area, western Henan.

The environmental and fluvial deposits change indexes are related to the grain size,pollen analysis,with the AMS14C dating.

Studies of fluvial deposits concerning both climate and sea level changes as well as sequence stratigraphy may become increasingly impotant in this millennium.

Sedimentary Structures and Environmental Interpretation of Majiagou Formation(middle ordovician)in Jiaozuo,Western Henan

Based on further analysis of the image logging data and combined with conventional logging data and seismic data,the lithology,sedimentary structure,sedimentary microfacies,sedimentary evolution,provenance of the ar- ea have been further studied.

Abundant the submarine hydrothermal water venting—flowing sedimentary structures were found in barite deposits, which are barite-vein structure in basal carbonaceous shale, eroding structure on basal carbonaceous shale, barite-discus structure and barite-pillar structure in basal barite deposit, thick bed barite, barite-stripe structure, horizontal .

Establishing interpretation models of sedimentary structures of Silurian in central Tarim Basin by applying logging data;

The total sedimentation was that rivers were branching and migrating frequently,and the sedimentary structures and fossil of ichnite were growing generally.