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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 1 Statistics of pore types and pore throat characteristics 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 | Proportions of different pore types | Pore throat size | Pore throat connectivity | Number of
samples | Intergra-
nular
dissolved pore/% | Feldspar dissolved pores/% | Debris dissolved pore/% | Carbonate dissolved pore/% | Intergra-
nular pore/% | Micro-
fracture/
% | Surface porosity/
% | Average
pore
radius/μm | Average
throat width/μm | Average pore-to-
throat ratio | Average
coordination number | | Normal pressure zone | 0.1-4.7
(1.7) | 0-1.5
(0.3) | 0-0.5
(0.1) | 0-0.3
(0.1) | 0-1.0
(0.2) | 0-0.5
(0.1) | 0.1-5.4
(2.5) | 34.6-125.8
(71.5) | 4.6-20.3
(11.7) | 2.6-6.1
(4.5) | 0.1-0.7
(0.4) | 26 | | Overpressure zone | 0.2-5.6
(1.8) | 0-2.3
(0.9) | 0-1.9
(0.5) | 0-2.5
(0.7) | 0-3.1
(1.6） | 0-2.2
(0.7) | 0.2-15.1
(6.2) | 53.1-111.4
(75.4) | 9.3-21.3
(15.9) | 3.8-5.4
(4.8) | 0.1-0.5
(0.3) | 41 | | Strong overpressure zone | 0.1-9.0
(3.3) | 0-4.6
(1.7) | 0-2.4
(0.4) | 0-3.5
(1.2) | 0-3.0
(1.2) | 0-1.8
(0.5) | 0.5-14.0
(8.3) | 63.8-232.6
(136.2) | 18.2-58.3
(22.1) | 3.9-6.7
(5.1) | 0.3-0.9
(0.6) | 126 |
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