Sedimentary Microfacies of the Chang 6 Oil-bearing Formation in Nanzhuang District,Ordos Basin

Used data of geochemical logging,well logging,outcrop, core and so on,combined with sedimentary characteristic and evolvement of sedimentary facies about YanChang formation in area.It is concluded that in studying district the sedimentary environment of chang 6 oil-bearing formation are lake and delta;the lithologic are the alternation of celadon mudstone,muddy siltstone and celadon,hoar granule arcose,and the sedimentary microfacies include subaqueous distributary channel,interdistributary embayment,mouth bar,sheet sand and urbidity.The sandbody of subaqueous distributary channel in delta front has the fine connectedness and is the main reservoir in this area.By analyzing sedimentary microfacies,it lays a foundation for efficienty exploring the oilfield of low permeability and makes a technical guidance for next work.