Abstract: The Well of SD-35 was drilled in the SD oilfield of the South Turgay Basin of Kazakhstan which is located in the east of the Aral Sea. Improvement of drilling technology has made cuttings smaller in mud logging process, which results in difficulties to make stratigraphic classification with conventional mud logging means. The change tendency of the characteristic element content in the X-ray fluorescence element logging can be used as a tool to identify lithology and classify strata. Based on the correlation between characteristic element content and the lithology from the cores and cuttings of Well SD-35, it is revealed that the change tendency of the Si, Al, Mg, K, S, Co, Cd, Ti elements in the interval of 1437.0-1464.0m is similar with that of the metaquartzite of the bottom, and there is a strong correlation. Therefore, the lithology is identified as metaquartzite with partly weathering associated with other data. The results show that the X- ray fluorescence element technique can be used as a new mean to mud logging and lithology identification and a new technical support for the quantitative stratigraphic interpretation and evaluation.