Enrichment rules and exploration practices of Paleogene shale oil in Jiyang Depression, Bohai Bay Basin, China

SONG Mingshui,LIU Huimin,WANG Yong,LIU Yali

Fig. 3. Characteristics and oil-bearing features of microcracks. (a) Well-FY1, sample No. 1469, oil seeps through grain edge fractures bigger than 10 nm during vacuuming, argon ion polishing scanning electron microscope; (b) Well-NY1, 3 295.28 m, shale bedding fracture, oil film, core sample; (c) Well-FY1, 3 177.39 m, abnormal pressure fracture, filled with asphalt, plane polarized light; (d) Well-L69, 3041.10 m, calcite dissolution fissure, filled with asphalt, plane polarized light; (e) Well-L69, 3 098.20 m, pressure solution fracture, filled with asphalt, plane polarized light; (f) Well-L69, 3 023.50 m, tectonic fracture, filled with asphalt, core sample.