Abstract: In order to evaluate the oil shale in the southern Songliao Basin using the logging data of the drilled wells, the logging response characteristics of the oil shale in the second member of the Nenjiang Formation in southern Songliao Basin were analyzed. The advantage of the continuity of logging data was fully utilized, and the data of the organiccarbon content and their logging response characteristics of the cores from 93 oil shale in 5 wells were used to establish the quantitative formula between the organiccarbon content and the oil yield(T^a=0.548 6TOC+0.18) and among △logR, natural gamma ray and organic carbon content (TOC=6.262 8×△logR+1.05) of the oil shale in the second member of the Nenjiang Formation. The oil yield model of the oil shale is also set up as T^a=0.5468a×△logR＋0.548 6×△TOC＋0.18 to quantitatively evaluate the oil shale based on logging data. The calculated oil yield of the oil shale is continuous and is almost same as their real oil yield, which thus solves the problem of having no oil yield data before, and provides rational oil yield and thickness of the oil shale for evaluation of the oil shale in the southern Songliao Basin.

Key words: logging, oil shale, oil yield, organic carbon, natural gamma ray