Pore throat structure and classification of Paleogene tight reservoirs in Jiyang depression, Bohai Bay Basin, China

WANG Yongshi,GAO Yang,FANG Zhengwei

Table 2 Pore throat structure parameters derived from routine mercury injection for Paleogene tight sandstone in the Jiyang depression.

Reservoir type Sedimentation facies Permeability/ 10-3 μm2 R0/μm R50/μm Ra/μm Max. mercury saturation/% Uniformity coefficient Construction coefficient Characteristic structure parameter Tight sandy conglo- merate 0.006-2.960 0.833 0.050-4.669 1.635 0.026-0.563 0.135 0.029-0.940 0.348 9.5-95.4 57.1 0.07-0.62 0.25 0.06-9.70 2.59 0.12-0.99 0.50 Tight Sand- stone Deltaic front subfacies 0.005-2.970 1.088 0.050-4.741 1.461 0.025-0.661 0.162 0.032-0.937 0.363 2.3-94.4 67.2 0.10-0.65 0.27 0.72-7.90 2.92 0.13-1.22 0.55 Beach-bar microfacies of inshore shallow lake subfacies 0.001-2.940 0.726 0.037-3.683 1.298 0.025-0.580 0.124 0.025-0.966 0.290 12.5-86.4 60.8 0.09-0.79 0.25 0.27-6.89 2.76 0.17-1.40 0.56 Turbidite facies 0.010-3.000 0.903 0.035-4.826 1.459 0.025-0.502 0.139 0.025-0.913 0.335 4.4-94.0 63.8 0.09-0.80 0.26 1.06-8.96 2.95 0.12-1.15 0.49