STUDY ON SED IM ENTARY FACIESOF CHANG 4+5_2TH RESERVOIR IN THE BAI YU SHAN BOREFILD

The analysis of regional structure,massive core samples,palaeon to logical,logging data reveals the depositional characteristics of sand groups,the rule of depositional microfacies distrubition in p lane,develops a set of deltaic front sandstones.Deltaic front includes distributary channel deposit,far sand dam and b ranch bay m icrofacies.With macroscopic depositional settings and microscopic depositional characteristics into consideration,river mou th bar, far sand dam and branch bay m-icrofacies.With macroscopic depositional settings and micro scopic depositional characteristics into consideration.Based on the log response of different sedimentary microfacies,the distribution character of the sedimentary facies in the plane is researched,and the facies sequence of this area are summed up.