Sedimentary Microfacies of Chang 6 Oil-bearing Member in Zhangcha Area,Ordos Basin

According to well logging for more than 140 wells and lots of laboratory analysis data,combined with a variety of facies marks,division of the Chang 6 oil-bearing member's sedimentary microfacies types was carried out;sedimentary microfacies and oil-gas distribution were analyzed.The results show that: the Chang 6 oil-bearing member has mainly developed delta front subfacies,microfacies are mainly underwater distributary channel,mouth bar and distributary bay.Underwater distributary channel sand body has stacked in vertical direction and has large thickness,it's main place for oil and gas enrichment;the research of distribution characteristics of sand body can provide a basis for next exploration and development.