Seismic Facies Models and Their Significance of Xujiahe Formation in Anyue-Tongnan Area

Based on the theory and method of seismic stratigraphy in combination with synthetic seismogram calibration,Xujiahe Formation is divided into four third-order seismic sequences.Two primary seismic facies models(onlap fill seismic facies and mounded seismic facies) are established.According to seismic facies parameters such as interior structure,exterior shape of seismic reflection units,reflected wave termination types,frequency,amplitude,continuity,and bed velocity,five groups and eight sub-groups of seismic facies are identified.This study establishes correlation among seismic facies,sedimentary facies and log facies based on sedimentary microfacies on cross-well section,analyzes the significance of seismic facies,and predicts the distribution of the favorable sedimentary facies in this area.