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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 2 Statistics on distribution frequency of sorting of samples from the Huagang Formation in the central- north of central inversion tectonic belt.
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| Sublayer | Depth/m | Frequency of samples with different sorting/% | Number
of samples | | Good | Moderate-good | Good-moderate | Moderate | Poor-moderate | Moderate-poor | Poor | | H3 | 3 245 | 39.1 | 19.6 | .4 | 26.1 | 0.9 | 4.4 | 2.4 | 540 | | H4 | 3 459 | 53.9 | 13.8 | 6.5 | 21.5 | 1.0 | 3.4 | | 414 | | H5 | 3 615 | 52.7 | 11.8 | 4.5 | 29.1 | | 1.8 | | 110 | | H6 | 3 874 | 60.7 | 10.7 | 7.4 | 16.4 | 1.6 | 2.5 | 0.8 | 122 | | H7 | 4 334 | 74.7 | 13.8 | 2.3 | 8.0 | | 1.1 | | 87 | | Average | 3 705 | 56.2 | 13.9 | 5.6 | 20.2 | 0.7 | 2.7 | 0.6 | 1 273* |
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