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Characteristics of parametamorphic rock reservoirs in Pingxi area, Qaidam Basin, NW China
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Zhiyuan XIA,Zhanguo LIU,Senming LI,Yongshu ZHANG,Bo WANG,Mingzhi TIAN,Jin WU,Kaizhen ZOU
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Table 1 Mineral contents from X-ray diffraction analysis of parametamorphic rocks in Pingxi area.
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| Well name | Lithology | Formation | Depth/
m | Mineral types and contents/% | Total amount of clay minerals/% | | Quartz | Potash Feldspar | Soda Feldspar | Calcite | Dolomite | Barite | Pyrite | Cubi-
cite | Anhy-
drite | Pyro-
xene | Side-
rite | | Dp172 | Slate | Silurian | 4 405.0 | 37.4 | 1.2 | 1.8 | 10.0 | | | 2.1 | | | | | 47.5 | | 4 414.0 | 28.0 | 0.6 | 1.5 | 15.5 | | 2.2 | | | 8.4 | 8.0 | | 35.5 | | 4 450.0 | 31.4 | | 2.5 | 7.9 | | 2.9 | 7.8 | | 2.6 | 6.6 | | 38.3 | | 4 490.0 | 31.5 | 0.2 | 2.2 | 5.6 | | 2.3 | 5.8 | | 1.5 | 5.8 | 8.9 | 36.2 | | Crystalline limestone | Ordovician | 4 520.0 | 12.9 | | 0.7 | 56.5 | 9.2 | 2.6 | | | 0.6 | | 3.8 | 13.7 | | 4 536.0 | 14.0 | | | 45.9 | 4.3 | 1.6 | 2.0 | | | | 11.1 | 21.1 | | 4 603.2 | 14.2 | | 0.7 | 66.5 | | 1.2 | | 1.0 | 0.7 | | | 15.8 | | 4 700.0 | 18.0 | | 3.0 | 52.6 | | 3.5 | | | | | | 22.9 | | 4 710.0 | 20.6 | 0.4 | 3.3 | 50.2 | | 2.3 | 2.0 | 1.4 | 1.0 | | 1.9 | 16.9 | | 4 720.0 | 23.6 | 0.5 | 5.6 | 53.6 | | 1.9 | | | | | | 14.8 | Calc-
schist | Ordovician | 4 590.0 | 20.4 | 0.5 | 1.2 | 37.5 | | 2.4 | | 2.3 | 0.9 | | 0.7 | 34.1 | | 4 600.9 | 39.7 | | 0.8 | 19.5 | 2.1 | | 9.1 | | | | | 28.8 | | 4 601.0 | 26.5 | 2.0 | 11.6 | 29.1 | | | | 17.9 | | | | 12.9 | | 4 730.0 | 28.0 | | 6.5 | 32.5 | | 2.6 | 3.5 | 2.0 | 1.1 | | 4.1 | 19.7 | | 4 740.0 | 22.1 | | 4.9 | 32.2 | | 2.8 | | | 1.1 | | | 36.9 | | 4 750.0 | 23.9 | | 3.3 | 32.7 | | 2.3 | | 2.1 | 1.1 | | | 34.6 |
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