Abstract: On the basis of analysis of seismic data, this paper divided the seismic fa-ciec by using“multi-parameter method" of seismic reflection, and represented seismic fa-cies types of each sequence with superiority seismic facies, then converted single well fa-cies section and outcrop section into time domain section to correlate seismic facies in seis-mic profile and establish the relation between seismic and sedimentary facies, and hence converted seismic facies into sedimentary facies ;regional lithology can be forecasted by es-tablishing lithology velocity crossplot based on the data of interval velocity and remaining interval velocity.

Key words: Tarim basin, Southwest, Depression, Rock type, Forecasting