Fine Division and Correlation of Glutenite Sedimentary Periods Based on Sedimentary Facies Inversion——A Case Study from the Paleogene Strata of Upper Es~4 in the Yanjia Area,Dongying Depression

Glutenite sedimentary system is a complex characterized with multiple developments and depositions.At present,there have been no practicable methods available for the fine division and contrast of glutenite sedimentary cycles at home and abroad.This study,based on sedimentary facies inversion,put forward a new method for fine division of glutenite sedimentary cycles.Based on the core observation and description,an FMI logging model was established for the study area using calibrating FMI logging data with the cores,and then four kinds of sedimentary sequences was identified precisely:Bouma cycle,high density turbidity flow,middle fan channel and outer fan mudstone.In addition,an FMI sequence of single well was set up for the whole Upper Es4 in the Yanjia area of the northern slope of the Dongying depression.Sequence interface and cyclic features were analyzed using FMI single-well sequence,which helped achieving the fine division of glutenite sedimentary periods.Through calibrating conventional curve with FMI single-well sequence,and employing the recognition indicators of the cores,FMI logging and conventional logging and constraint of the distribution rule of the facies belts,this study compared the cycles of running wells using the recurrence method for the long-term ascent-dominating cycle and sequence antithesis for high-grade to low-grade.This to some extent solved the areal facies change and then set up a high-resolution sequence framework.