Abstract: Element capture service (ECS) can be applied to quantitative determination of the contents of Si, Ca, Fe, S, Ti, Gd in stratum. The correlation of these elements and lithology and given rock mineral contents can be used for distinct lithology and strata correlation as well as porosity and oil saturation corrections. This technique has been applied to Well block Cai-31 for lithology identification, and a good accordance between ECS's lithology and core-describe lithology is gained. The study shows that using ECS lithological profile and element content integrated with conventional well log data, the strata correlation, sedimentary environment recognition and deposition analysis could be conducted in more detail.

Key words: element, capture, well log, application