Characteristics of compact oil in different occurrence states (a1) – (a3) are the micro-occurrence characteristics of emulsion form of tight oil under fluorescent thin section, ESEM and EDS, respectively, S2, 2138.1 m; (b1) – (b3) are the micro-occurrence characteristics of throat form of tight oil under fluorescent thin section, ESEM and EDS, respectively, S3, 2192.6 m; (c1) – (c3) are the micro-occurrence characteristics of cluster form of tight oil under fluorescent thin section, ESEM and EDS, respectively, S9, 2189.4 m; (d1) – (d3) are the micro-occurrence characteristics of namely thin form of tight oil under fluorescent thin section, ESEM and EDS, respectively, S6, 2235.6 m; (e1) – (e3) are the micro-occurrence characteristics of isolation particle or agglomerated particle form of tight oil under fluorescent thin section, ESEM and EDS, respectively, S3, 2192.6 m.