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Accumulation contribution differences between lacustrine organic-rich shales and mudstones and their significance in shale oil evaluation
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ZHAO Wenzhi,ZHU Rukai,HU Suyun,HOU Lianhua,WU Songtao
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Table 2 Main geological parameters of shale in the Ordos, Songliao and Junggar basins.
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| Basin | Horizon | Porosity/
% | Ro/
% | TOC/
% | Oil satura-
tion/% | Formation pressure coefficient | GOR/
(m3·m-3) | Baume degree/
(°) | Thick-
ness/m | Prospective oil resources/108 t | Economic resources at $60 per barrel/108 t | | Ordos | Yanchang Formation | 3-7 | 0.70-1.00 | 5-38 | 80-90 | 0.70-0.85 | 5-30 | 34 | 22 | 450 | 160 | | Songliao | Nengjiang Formation | 3-8 | 0.80-1.10 | 2-12 | 70-90 | 1.10-1.80 | 8-40 | 25 | 25 | 120-150 | 20 | | Junggar | Lucaogou Formation | 5-8 | 0.70-0.95 | 2-16 | 80-95 | 1.20-1.58 | 1-30 | 22 | 120 | 50 | 5 |
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