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Pore throat structure and classification of Paleogene tight reservoirs in Jiyang depression, Bohai Bay Basin, China
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WANG Yongshi,GAO Yang,FANG Zhengwei
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Table 1 Rock constituents in Paleogene tight sandstone and sandy conglomerate of different sedimentation types in the Jiyang depression.
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| Reservoir type | Sedimentation facies | Grain fraction/% | Relative debris content/% | | Quartz | Feldspar | Debris | Ratio of quartz
content to feldspar-debris content | Magmatic rock debris | Metamorphic rock debris | Sedimentary rock debris | Sandstones with pebbly sandstone and gravel
sandstone in tight
sandy conglomerate | | 30.7 | 38.5 | 30.8 | 0.46 | 11.5 | 77.5 | 11.0 | Tight
sandstone | Deltaic front subfacies | 44.3 | 32.2 | 23.5 | 0.85 | 23.9 | 63.3 | 12.8 | Beach-bar microfacies
of inshore shallow
lake subfacies | 43.8 | 35.1 | 21.1 | 0.79 | 24.1 | 58.1 | 17.8 | | Turbidite facies | 43.0 | 32.4 | 24.6 | 0.80 | 25.6 | 63.0 | 11.4 |
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