Estimating pore volume compressibility by spheroidal pore modeling of digital rocks

SUI Weibo,QUAN Zihan,HOU Yanan,CHENG Haoran

Table 1 Aspect ratios and volume proportions of different types of pores in the spheroidal pore models of the 10 digital core samples.

No.	Sample name	Prolate ellipsoidal pores				Oblate ellipsoidal pores				Spherical pores	Poro- sity/%
No.	Sample name	Volume proportion/%	Aspect ratio	Mean	Variance	Volume proportion/%	Aspect ratio	Mean	Variance	Volume proportion/%	Poro- sity/%
1	Bentheimer sandstone	54.19	1.11-7.96	2.07	0.440	45.76	0.16-0.90	0.54	0.020	0.04	23
2	Doddington sandstone	54.83	1.13-9.40	2.37	0.820	45.15	0.15-0.86	0.54	0.030	0.02	25
3	Estaillades carbonate	60.28	1.11-12.75	2.26	1.120	39.51	0.15-0.87	0.57	0.030	0.21	25
4	Berea sandstone	45.00	1.11-4.90	1.86	0.380	54.11	0.23-0.90	0.60	0.005	0.89	15
5	Fountainebleau sandstone	38.85	1.12-4.87	1.74	0.340	58.25	0.22-0.90	0.64	0.030	2.91	8
6	Wilcox sandstone	66.43	1.15-8.31	2.52	1.270	32.83	0.12-0.87	0.51	0.030	0.74	2
7	Daqing sandstone	57.71	1.11-9.58	2.43	0.830	42.23	0.11-0.88	0.50	0.020	0.06	13
8	Tarim sandstone	59.75	1.13-10.84	2.25	0.800	40.11	0.12-0.90	0.54	0.020	0.14	13
9	Eastern South China Sea sandstone	57.69	1.14-10.72	2.38	0.880	42.19	0.13-0.88	0.52	0.020	0.12	14
10	Xinjiang sandstone	60.91	1.14-12.12	2.34	0.860	38.97	0.12-0.88	0.52	0.020	0.12	12