Evolution of Ordovician YJ1X ultra-deep oil reservoir in the Yuecan oilfield, Tarim Basin, NW China

YANG Peng,LIU Keyu,LI Zhen,MCINNES Brent Ian Alexander,LIU Jianliang

Fig. 9. Petrographic characteristics of oil inclusions from the Ordovician Yijianfang Formation in Well YJ1X. (a) Sample from 7229.30 m, bright blue fluorescing, diphasic (Loil-V) Group I oil inclusions with vapor filling degrees greater than 10%, λmax = 533.59 nm, QF535 = 1.46, transmitted light; (b) Sample from 7229.30 m, bright blue fluorescing, diphasic (Loil-V) Group I oil inclusions with vapor filling degrees greater than 10%, λmax = 533.59 nm, QF535 = 1.46, UV fluorescence; (c) Sample from 7213.68 m, some bright blue fluorescing Group I oil inclusions occurring along the growth zone of C2 calcite cement, showing typical characteristics of primary fluid inclusions, UV fluorescence; (d) Sample from 7213.68 m, blue-white fluorescing, triphasic (Sbit-Loil-V) Group II oil inclusions with vapor filling degrees less than 5% and some bitumen occurring along the walls of oil inclusions, λmax = 538.03 nm, QF535 = 2.30, transmitted light; (e) Sample from 7213.68 m, blue-white fluorescing, triphasic (Sbit-Loil-V) Group II oil inclusions with vapor filling degrees less than 5% and some bitumen occurring along the walls of oil inclusions, λmax = 538.03 nm, QF535 = 2.30, UV fluorescence; (f) Sample from 7259.52 m, near-white fluorescing, diphasic (Sbit-Loil) or triphasic (Sbit-Loil-V) Group II oil inclusions with high bitumen content and vapor filling degrees less than 5%, λmax = 555.49 nm, QF535 = 3.03, transmitted light; (g) Sample from 7259.52 m, near-white fluorescing, diphasic (Sbit-Loil) or triphasic (Sbit-Loil-V) Group II oil inclusions with high bitumen content and vapor filling degrees less than 5%, λmax = 555.49 nm, QF535 = 3.03, UV fluorescence; (h) Sample from 7220.51 m, one blue-white fluorescing Group II oil inclusion assemblage intersecting another bright blue fluorescing Group I oil inclusion assemblage, UV fluorescence; (i) Sample from 7229.30 m, bright blue fluorescing Group I oil inclusions and coeval aqueous inclusions, transmitted light; (j) Sample from 7229.30 m, bright blue fluorescing Group I oil inclusions and coeval aqueous inclusions, UV fluorescence; (k) Sample from 7261.32 m, blue-white fluorescing Group II oil inclusions and coeval aqueous inclusions, transmitted light; (l) Sample from 7261.32 m, blue-white fluorescing Group II oil inclusions and coeval aqueous inclusions, UV fluorescence.