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Factors controlling the development of tight sandstone reservoirs in the Huagang Formation of the central inverted structural belt in Xihu sag, East China Sea Basin
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XU Fanghao,XU Guosheng,LIU Yong,ZHANG Wu,CUI Hengyuan,WANG Yiran
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Table 3 Recovered original porosity of sandstone samples from different sedimentary microfacies of the Huagang Formation.
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| Microfacies | Well | Layer | Depth/m | Sorting
coefficient | Original porosity/% | Under water
distributary | MN7 | H3 | 3398-3660 | 1.81 | 34.06 | | MN5 | H3 | 2992-3245 | 1.98 | 32.99 | | MN1 | H3 | 3600-3873 | 1.90 | 33.06 | | MN3 | H5 | 4244-4435 | 2.51 | 30.09 | | Average | | 2.05 | 32.55 | Channel bar-river
bed | WS1 | H3 | 4261-4420 | 1.47 | 36.54 | | H8 | 4925-5129 | 1.47 | 36.54 | | WS2 | H3 | 4254-4409 | 1.27 | 38.99 | | H5 | 4511-4626 | 1.25 | 39.20 | | H7 | 4749-4853 | 1.22 | 39.68 | | H8 | 4853-4973 | 1.19 | 40.17 | | H9 | 4973-5125 | 1.46 | 37.62 | | WS3 | H6 | 4632-4699 | 1.57 | 35.68 | | Average | | 1.34 | 38.35 |
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