超低渗储集层水驱驱替界限表征方法

doi:10.7657/XJPG20250317

摘要/Abstract

摘要：

超低渗油藏通常采用水驱开发，而水驱开发的驱替界限影响因素较复杂，为了研究超低渗储集层水驱驱替界限的表征方法，根据性质将孔隙度、渗透率、孔喉半径、均质系数等12个参数划分为孔渗类、非均质类以及孔喉半径类；运用Pearson相关系数法，从不同类参数中选出最优表征参数，并根据优选的表征参数构建驱替界限特征指数；通过水驱实验获得不同岩心的驱替界限，根据驱替界限与特征指数的拟合效果确定表征模型。结果表明，渗透率、变异系数以及加权平均孔喉半径能有效表征超低渗储集层水驱驱替界限，将驱替界限与特征指数进行拟合，可建立有效的超低渗储集层驱替界限表征模型。

关键词: 超低渗储集层, 水驱驱替界限, 可动流体饱和度, 孔喉半径截止值, 特征指数, 表征模型

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

中图分类号:

TE122

陈霖, 许倩雯, 陈坤, 陈小东, 刘文, 文林, 刘斌. 超低渗储集层水驱驱替界限表征方法[J]. 新疆石油地质, 2025, 46(3): 388-394.

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.

图/表 8

表1

研究区孔喉结构特征参数统计"

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

表1

表2

表3

图1

表4

图2

图3

图4

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