Lithology Identification For The Unconventional Oil And Gas Resources Of Ek₂ In Cangdong Sag

The shale oil reservoir of Ek₂in Cangdong sag is characterized by complex lithology.Reservoir lithology identification is one of the problems to be solved in production.In the thesis,the shale oil of Ek₂in Cangdong sag was studied,where the relationship between lithology,physical property and oil saturation were investigated based on logs combined with core casting thin sections and the whole rock XRD.Three-end mineral normalized lithology classification was used for the transitional rocks with thick mudstone,oil shale intercalated with sandstone and dolomite.The transitional lithology could be divided into 4 categories and 12 rock types.The relationship between lithology and logs response was established by selecting logging sensitive curves,and the transition lithology was divided.The transition lithology classification charts were established with multi-parameter logs fusion,and the continuous automatic discrimination of log lithology classification was realized.Studies on quantitative evaluation method of mineral composition and multi-mineral interpretation model were used for quantitative calculation of mineral composition.With core analysis,logs analysis and mineral interpretation model,a lithology identification method of the Ek₂in Cangdong sag has been established,and the application effect is good.