Establishment and application of the prediction equation of clay minerals

To make logging data more applied in geological study practice, well logging data were used to predict the type and content of clay minerals, and the enrichment regularity and evolution characteristics of clay minerals in different sedimentary environments were studied. By taking Dongying sag as the research area, four multiple regression equations for predicting clay minerals were obtained by means of multiple regression between logging parameters and clay minerals. It is believed that the enrichment of clay minerals conforms to the changes of sedimentary environments and the evolution from illite –smectite mixed layer to illite as the buried depth increased is evident through calculating the clay mineral content of the top surface from the lower part of Sha–3 member to the upper part of Sha–4 member in 9 typical wells of Dongying sag.