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Heterogeneity and influencing factors of marine gravity flow tight sandstone under abnormally high pressure: A case study from the Miocene Huangliu Formation reservoirs in LD10 area, Yinggehai Basin, South China Sea
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FAN Caiwei,CAO Jiangjun,LUO Jinglan,LI Shanshan,WU Shijiu,DAI Long,HOU Jingxian,MAO Qianru
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Table 2 High-pressure mercury injection parameters of Huangliu Formation and reservoir at the similar depth in different pressure zones in the study area of Yinggehai Basin.
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| Formation pressure zone | Displacement pressure/MPa | Median
pressure/
MPa | Median
radius/mm | Maximum
mercury injection
saturation/% | Mercury
withdrawal
efficiency/% | Sorting
coefficient | Variation coefficient | Number of samples | | Normal pressure zone | 0.05-1.15
(0.52) | 5.94-35.67
(14.97) | 0.01-0.53
(0.25) | 53.24-81.67
(63.89) | 14.95-51.23
(31.67) | 2.80-5.45
(3.71) | 0.21-0.61
(0.47) | 6 | | Overpressure zone | 0.01-1.50
(0.63) | 1.59-67.73
(8.52) | 0.05-0.46
(0.29) | 52.17-97.37
(79.99) | 15.05-46.72
(28.90) | 1.88-5.49
(3.55) | 0.24-0.52
(0.35) | 22 | Strong
overpressure zone | 0.01-0.70
(0.20) | 0.52-35.21
(4.39) | 0.01-1.42
(0.32) | 64.65-99.51
(85.24) | 24.44-49.70
(36.75) | 2.60-3.90
(3.15) | 0.18-0.58
(0.29) | 31 |
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