Abstract: In Hailar basin, the structure of lithological profiles is complex, not only containing volcanic lava and normal sedimentary rocks, but containing transitional volcanic lithology. Based on a large number of core experimental analysis and detailed log data analysis, major lithological types and distribution laws in Nantun Formation and the strata below the Formation are summed up.What?s more, the variation of log response correspondent with major lithology is analyzed in details. The result of log response analysis provides basis for complex lithology identification in the basin.

Key words: lithological distribution, log response, volcanic rock bearing, Hailar Basin