Abstract：On the basis of fine 3-D seismic data,the paper used coherent data volume technique,TDQ (Time-Depth Quality)technique for fine fault interpretation of Second Sand Member of Aershan Formation in N-50 well zone of Erenaoer depression,Erlian Basin and built up a fine structural model;using neural network technique for automatic identification of seismic facies,accurate division of 5 seismic facies,and further using the analysis of single well fades to transform these 5 seismic facies to depositional facies;then the distribution of each depositional fades can be defined;f inally,the paper pointed out that the underwater distributary channel facies in frontal fan delta is a favorable depositional facies.
