Geological characteristics, evaluation criteria and discovery significance of Paleogene Yingxiongling shale oil in Qaidam Basin, NW China

LI Guoxin,ZHU Rukai,ZHANG Yongshu,CHEN Yan,CUI Jingwei,JIANG Yinghai,WU Kunyu,SHENG Jun,XIAN Chenggang,LIU He

Fig. 7. Development characteristics and oil-bearing property of laminae in the upper member of Lower Ganchaigou Formation of Paleogene in Well Chai 2-4 in Yingxiongling area. (a) 2801.30-2 801.86 m, thin layer shale, interbedded with carbonate rock, and the thickness of sigle carbonate layer is mostly less than 10 cm; (b) 2807.84-2808.93 m, laminar shale with single layer thickness of 50-500 μm, carbonate and argillaceous laminae interbedding; (c) 2815.76 m, the fluorescence thin section of thin shale-carbonate rock has strong overall fluorescence response, indicating that the matrix pores are generally oil-bearing; (d) 2844.07 m, laminar shale fluorescent thin section has strong fluorescence response of hydrocarbon generating lamina and obvious in-situ retention characteristics; (e) 2815.76 m, fluorescence image of thin shale core; (f) 2844.07 m, fluorescence image of laminar shale core.