Heterogeneity Characteristics of Lacustrine Shale Oil Reservoir Under the Control of Lithofacies: A Case Study of the Dongyuemiao Member of Jurassic Ziliujing Formation, Sichuan Basin

The lacustrine shale in the Dongyuemiao Member of Fuling area, Sichuan Basin, is widely distributed and has huge oil resource potential. It one important replacement areas for exploration China. To investigate key evaluation well, Well FY10, X-ray diffraction (XRD) mineral analysis, Rock-Eval, argon ion polishing-scanning electron microscope (SEM), Mercury injection capillary pressure (MICP), low nitrogen adsorption were launched to determine heterogeneity pore system Member. composition exhibits a high degree heterogeneity, can be divided into two main lithofacies: argillaceous mixed shale. porosity ranges from 2.95 8.43%, permeability 0.05 1.07 × 10 ?3 ?m 2 . physical properties are obviously better than those Inorganic pores, such as linear pores between clay minerals calcite dissolution mainly developed, while small amount organic observed. average total volume (V p ) 0.038 ml/g with an specific surface area 5.38 m /g. Mesopores provide V (average 61.72%), micropores mostly area. TOC imposes strong controlling effect on development micropores. Clay contributors mesopores macropores. organic-inorganic interaction during process diagenesis hydrocarbon generation controls formation systems.