Development of Formation Element Logging Technique and Its Application

Formation elements logging is a neutron gamma spectroscopy logging technique used to acquire the content of elements and minerals by recording the gamma ray produced by the reaction of neutron and elemental nucleus in the formation. It has a wide usage in discriminating complex lithology and evaluating unconventional reservoir. In this paper, the geological basement and nuclear physics basement of elemental spectroscopy logging are briefly stated. Technical specification of the elemental capture spectroscopy tool, the geochemical logging tool and the formation lithology spectrometer tool are analyzed. Methods of determining the elements content by spectroscopy analysis and acquiring mineral content by oxide closure model, cluster-factor analysis are systematically discussed. The application of elemental spectroscopy logging in formation evaluation is summarized and finally that controllable neutron source, multi-detectors, multiparameter measurement will be the development trend of formation elements logging is raised.