New techniques such as air drilling, PDC and impregnated bit + fast-spiral screw have been practiced widely in Yuanba region of the northeast oft-com:office:smarttags" />Sichuan Basin. It deals with the contents of 14 elements such as Mg, Al, K, Si, S, Ca and Fe in rock samples so as to analyze lithologic features and to identify formation boundaries. The new technique was practiced in well YB10.4 115 samples collected from 702~7 155 m deep were analyzed. According to element contents and curve changes, combined with outcrop lithologic data, continental sandstone and mudstone as well as marine carbonate rock were distinguished. The results were accordant with electric logging data in 92.60%.