Pore-throat structure characteristics and its impact on the porosity and permeability relationship of Carboniferous carbonate reservoirs in eastern edge of Pre-Caspian Basin
LI Weiqiang,MU Longxin,ZHAO Lun,LI Jianxin,WANG Shuqin,FAN Zifei,SHAO Dali,LI Changhai,SHAN Fachao,ZHAO Wenqi,SUN Meng
Table 2 Types of pore-throat structures of Carboniferous KT-I layer in North Truva Oilfield.
Pore-throat structure type Frequency distribution curve
of pore-throat radii		 Average pore-throat
radius/μm		 Sorting
coefficient		 Efficiency of mercury
withdrawal/%		 Porosity/% Permeability/
10-3 μm2
Wide multi-
modal type		 0.30-10.92
(3.42)		 1.58-3.86
(2.61)		 16.4-62.5
(39.9)		 1.18-25.40
(11.98)		 0.07-198.90
(27.90)
Wide
bimodal
type		 0.03-11.10
(3.52)		 1.41-3.87
(2.62)		 6.3-59.1
(33.7)		 4.50-35.70
(17.50)		 0.01-209.00
(48.70)
Centralized
unimodal type		 0.01-4.65
(0.90)		 0.96-2.59
(1.75)		 2.4-74.1
(33.0)		 2.44-38.36
(13.30)		 0.01-349.00
(26.70)
Asymmetric
bimodal type		 0.25-10.30
(4.10)		 1.14-3.12
(2.17)		 8.4-57.7
(27.4)		 3.00-16.90
(10.90)		 0.01-2.68
(0.56)