海陆过渡相煤系页岩的渗流特征

张宏学; 刘卫群

doi:10.11858/gywlxb.20180556

海陆过渡相煤系页岩的渗流特征

doi: 10.11858/gywlxb.20180556

张宏学^1,,
刘卫群^{2, 3}

1.
安徽理工大学力学与光电物理学院, 安徽淮南 232001
2.
中国矿业大学(徐州)力学与土木工程学院, 江苏徐州 221116
3.
中国矿业大学(徐州)深部岩土力学与地下工程国家重点实验室, 江苏徐州 221116

基金项目:

安徽省教育厅科研基金 KJ2016A207

详细信息

作者简介:
张宏学(1982-), 男, 讲师, 主要从事裂隙岩体渗流研究.E-mail:hxzhang@aust.edu.cn

中图分类号: P618.12;TE312
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出版历程
- 收稿日期: 2018-05-08
- 修回日期: 2018-06-04

Seepage of Marine-Terrigenous Facies Coal Measures Shale

ZHANG Hongxue^1
,,
LIU Weiqun^{2, 3}

1.
School of Mechanics and Optoelectronics Physics, Anhui University of Science and Technology, Huainan 232001, China
2.
School of Mechanics & Civil Engineering, China University of Mining and Technology(Xuzhou), Xuzhou 221116, China
3.
State Key Laboratory for Geomechanics & Deep Underground Engineering, China University of Mining and Technology(Xuzhou), Xuzhou 221116, China

摘要

摘要: 利用脉冲衰减渗透率仪，测试了海陆过渡相煤系页岩在储层条件、不同应力状态下的渗透率，得到了渗透率随有效应力的演化规律，对比分析煤系页岩和美国Wilcox页岩的渗透率。结果表明：当围压为常数（17 MPa），有效应力从12.5 MPa降至2.0 MPa时，煤系页岩的渗透率范围为2.9×10^-19~5.7×10^-18 m²，比Wilcox页岩的渗透率高2~3个数量级。根据外部围压p_c和内部孔隙压力p_p定义有效应力σ_e=p_c-χp_p，有效应力系数χ约为1。渗透率试验数据的拟合结果显示，煤系页岩和Wilcox页岩的渗透率随有效应力、围压（常孔隙压力）和孔隙压力（常围压）按指数函数变化。
- 海陆过渡相 /
- 煤系页岩 /
- Wilcox页岩 /
- 渗透率 /
- 有效应力
Abstract: Using a pulse decay permeameter, we conducted a combination of laboratory experiments to study permeability evolution of marine-terrigenous facies coal measures shale under reservoir conditions, and obtained the permeability of coal measures shale under different stress states, and furthermore analyzed the permeability of coal measures shale and Wilcox shale.The results show that the permeability of coal measures shale ranges from 2.9×10^-19 to 5.7×10^-18 m² as the effective stress is decreased from 12.5 to 2.0 MPa at constant confining pressure (p_c=17 MPa), and is 2-3 orders of magnitude greater than that of Wilcox shale.The effective stress is given in terms of the external confining pressure and the internal pore pressure by σ_e=p_c-χp_p, where χ is approximately equal to 1.The fitting results of the experimental permeability show that the permeability of coal measures shale and Wilcox shale change exponentially with the effective stress, confining pressure (at constant pore pressure) or pore pressure (at constant confining pressure).
- marine-terrigenous facies /
- coal measures shale /
- Wilcox shale /
- permeability /
- effective stress

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图 1 脉冲衰减渗透率仪

Figure 1. Pulse decay permeameter

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图 2 脉冲衰减渗透率仪原理

Figure 2. Schematic diagram of pulse decay permeameter

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图 3 围压不变时煤系页岩渗透率随孔隙压力的变化

Figure 3. Permeability of shale sample as a function of pore pressure at constant confining pressure

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图 4 孔隙压力不变时煤系页岩渗透率随围压的变化

Figure 4. Permeability of shale sample as a function of confining pressure at constant pore pressure

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图 5 煤系页岩岩样S-1渗透率的对数随围压和孔隙压力的变化

Figure 5. Permeability of coal series shale sample S-1 as a function of confining pressure and pore pressure

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图 6 围压不变时煤系页岩试样渗透率随有效应力的变化

Figure 6. Permeability of shale samples as a function of effective stress at constant confining pressure

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图 7 煤系页岩和Wilcox页岩的渗透率比较

Figure 7. Comparison of permeability of coal series shale and Wilcox shale

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表 1 煤系页岩岩样参数

Table 1. Parameters of coal series shale samples

Sample No.	Dimension/(mm×mm)	V_p/cm³	φ/%
S-1	∅23.88×41.59	0.94	5.04
S-5	∅23.29×49.11	1.18	5.62

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表 2 页岩岩样在不同围压和孔隙压力作用下的渗透率

Table 2. Permeability of shale samples under different confining pressures and pore pressures

p_c/MPa	p_p/MPa	σ_e/MPa	k/m²		p_c/MPa	p_p/MPa	σ_e/MPa	k/m²
p_c/MPa	p_p/MPa	σ_e/MPa	S-1	S-5	p_c/MPa	p_p/MPa	σ_e/MPa	WS22.5^[21]	WS22.7^[21]
17	4.5	12.5	2.9×10^-19	1.8×10^-18	10	13	3	2.7×10^-19	2.2×10^-19
17	8.0	9.0	7.6×10^-19	3.0×10^-18	10	15	5	9.0×10^-20	1.0×10^-19
17	11.5	5.5	2.4×10^-18	4.2×10^-18	10	18	8	3.0×10^-20	5.6×10^-20
17	15.0	2.0	4.2×10^-18	5.7×10^-18

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