Abstract: Deviations exist in the chemical methods for studying source rock. This paper pays attention to analysis of the today's condition of well -logging information application on source rock evaluation, and studies the well logging responds of lower Tertiary source in Subei basin. According to ΔLogR technique, sonic transit -time and resistivity curves can be used to determine accurately the organic richness and provide a continuous TOC value.These work correct validly deviations of laboratory sample analysis, and provide reasonably the thickness of source rock and organic carbon contest for evaluation of source rock or petroleum resource.