A Displacement Limit Characterization Method for Waterflooding in Ultra-Low Permeability Reservoirs

doi:10.7657/XJPG20250317

Abstract

Abstract:

Ultra-low permeability reservoirs are typically developed by waterflooding, which yet is highly complex in the factors influencing displacement limits. To establish a waterflood displacement limit characterization method for ultra-low permeability reservoirs, 12 parameters were considered, including porosity, permeability, pore-throat radius, and heterogeneity coefficient. These parameters are classified into three categories：porosity-permeability, heterogeneity, and pore-throat radius. By using the Pearson correlation coefficient method, the optimal characterization parameters were identified from each category, and a characteristic displacement index was then constructed based on the selected parameters. Waterflooding experiments were conducted to determine displacement limits for different core samples, and a characterization model was established by fitting the displacement limits with the characteristic index. The results indicate that, among the influencing parameters, permeability, variation coefficient, and weighted average pore-throat radius can effectively characterize the displacement limits of ultra-low permeability reservoirs. By fitting the displacement limits with the selected characterization parameters, a reliable waterflood displacement limit characterization model for ultra-low permeability reservoirs can be developed.

Key words: ultra-low permeability reservoir, displacement limit, movable fluid saturation, pore-throat radius cutoff, characteristic index, characterization model

CLC Number:

TE122

CHEN Lin, XU Qianwen, CHEN Kun, CHEN Xiaodong, LIU Wen, WEN Lin, LIU Bin. A Displacement Limit Characterization Method for Waterflooding in Ultra-Low Permeability Reservoirs[J]. Xinjiang Petroleum Geology, 2025, 46(3): 388-394.

Figures/Tables 8

Table 1.

Characteristic parameters of pore-throat structure in the study area"

岩心编号	渗透率/ mD	孔隙度/ %	结构系数	均质系数	孔喉中值半径/μm	最大孔喉半径/μm	平均孔喉半径/μm	孔喉半径均值	分选系数	变异系数	歪度系数	峰态系数
1	0.69	10.5	0.2	0.28	0.09	0.40	0.11	12.5	1.3	0.10	0.2	0.9
2	0.36	11.0	1.4	0.28	0.15	0.69	0.19	12.1	1.8	0.15	0.3	0.7
3	0.15	6.9	0.9	0.10	0.06	1.24	0.12	12.9	1.7	0.13	-0.1	0.8
4	0.31	13.4	1.2	0.16	0.10	0.92	0.15	12.4	1.6	0.13	0.1	0.9
5	0.56	8.5	0.3	0.19	0.07	0.69	0.13	12.6	1.6	0.13	0	0.8
6	0.26	11.8	1.2	0.21	0.09	0.71	0.15	12.4	1.6	0.13	0	0.8
7	0.35	8.9	0.3	0.16	0.06	0.60	0.09	13.1	1.4	0.11	0	0.9
8	0.38	6.7	0.1	0.13	0.05	0.45	0.06	13.5	1.0	0.07	0.2	1.1
9	0.23	10.5	1.5	0.20	0.11	0.80	0.16	12.4	1.8	0.14	0.2	0.8
10	0.71	6.0	0.2	0.14	0.05	0.94	0.13	13.1	1.9	0.14	-0.3	0.9
11	0.05	7.5	9.8	0.18	0.14	1.23	0.22	12.2	2.0	0.16	0.2	0.7
12	0.70	7.2	0.0	0.07	0.03	0.68	0.05	14.3	1.0	0.07	-0.1	1.5
13	0.49	6.2	0.2	0.16	0.04	0.76	0.12	13.0	1.8	0.14	-0.3	0.8
14	0.87	9.5	0.3	0.18	0.09	0.85	0.15	12.5	1.7	0.13	0.1	0.9
15	0.54	16.4	0.5	0.17	0.06	0.69	0.12	12.7	1.3	0.10	-0.3	0.8
16	0.07	12.1	7.7	0.23	0.14	0.86	0.19	12.1	1.7	0.14	0.2	0.8
17	0.37	12.2	0.3	0.17	0.07	0.54	0.09	12.9	1.2	0.09	0.2	1.0
18	0.51	11.8	0.5	0.19	0.09	0.70	0.13	12.5	1.6	0.12	0.1	0.9
19	0.08	5.7	3.8	0.30	0.16	0.69	0.21	12.0	1.7	0.15	0.3	0.8
20	0.32	6.3	0.4	0.18	0.06	0.70	0.13	12.8	1.7	0.13	-0.1	0.8
21	0.05	6.2	1.2	0.10	0.05	0.82	0.09	13.1	1.2	0.09	-0.1	1.3
22	0.22	11.5	5.5	0.30	0.28	0.96	0.29	11.6	1.9	0.17	0.5	0.7
23	0.05	9.1	1.8	0.15	0.06	0.57	0.08	13.1	1.3	0.10	0	1.2
24	0.33	10.9	0.5	0.22	0.07	0.48	0.10	12.7	1.2	0.10	-0.1	0.9
25	0.17	11.4	1.7	0.20	0.08	0.70	0.14	12.5	1.7	0.13	0	0.8
26	0.25	8.9	1.2	0.18	0.09	0.95	0.17	12.6	1.9	0.15	0	0.7
27	0.06	7.5	1.9	0.20	0.07	0.55	0.11	12.9	1.6	0.12	0	0.8
28	0.27	9.1	1.0	0.19	0.08	0.83	0.15	12.5	1.8	0.14	0	0.8
29	0.06	5.1	0.3	0.11	0.03	0.50	0.05	14.0	1.2	0.09	-0.2	1.3
30	0.08	7.7	1.1	0.21	0.05	0.46	0.09	13.0	1.5	0.11	-0.2	0.9
31	0.47	10.2	0.4	0.27	0.09	0.43	0.12	12.7	1.5	0.12	0.2	0.8
32	0.04	6.9	3.0	0.25	0.10	0.48	0.12	12.6	1.5	0.12	0.2	0.9
33	0.23	12.3	0.8	0.22	0.08	0.49	0.11	12.7	1.4	0.11	0	1.0
34	0.17	9.3	1.5	0.21	0.08	0.72	0.15	12.6	1.8	0.14	0	0.7
35	0.19	10.4	1.1	0.21	0.08	0.59	0.13	12.7	1.6	0.13	0	0.8

Table 1.

Table 2.

Table 3.

Fig. 1.

Table 4.

Fig. 2.

Fig. 3.

Fig. 4.

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