Researches on sedimentary facies and sequences stratigraphy of Silurian in Tahe oilfield

According to the analysis of coring and logging data,this paper believes the tidal-flat and shallow-marine shelf is the main facies of Silurian in Tahe area.The main micro-sedimentary facies is characterized by high tidal-flat,low tidal-flat,middle tidal-flat,and shallow-marine shelf mud.In combination with the analysis of litho stratigra phy,bio-stratigraphy and seismic stratigraphy,the clastic rock strata of Silurian in Tahe area could be divided into three third-sequence from bottom to top,middle tidal-flat is the main facies in LST of SQ1,and the main facies in TST is shallow-marine shelf mud.LST in SQ2 are dominated by middle tidal-flat,and there are no TST in SQ2.LST in SQ3 are composed of middle tidal-flat sediments,early TST of SQ3 is dominated by low tidal-flat sediments,and middle tidal-flat is the main facies in late HST.