水相渗吸对页岩储层的物化作用机理研究

doi:10.13809/j.cnki.cn32-1825/te.2023.01.007

Abstract

Abstract:

Shale gas reservoirs, which develope micro-nano pore throats and fractures, have high clay mineral content, and strong heterogeneity of porosity. Therefore, large-scale hydraulic fracturing is usually needed to realize the effective exploitation. In the process of hydraulic fracturing, the spontaneous imbibition of the water phase will trigger a series of physical and chemical effects on the shale gas reservoir, changing the pore structures, physical and chemical properties of shale gas reservoirs, thereby affecting the production of shale gas. In order to further clarify the influence mechanism of water phase imbibition in shale gas reservoirs, multiple repetitive imbibition experiments were carried out. Based on the changes in rock sample quality caused by mineral dissolution, the visual characteristics of samples from scanning electron microscope, the observation of nuclear magnetic resonance pore structures, and the change of physical properties, the impact of imbibition on the microscopic pore structure, permeability and porosity of shale are revealed. The results show that: ① Water imbibition causes fractures in shale, thus changing the pore structure; ② The proportion of macropores increases in shale samples with significantly improved porosity, which indicates that water imbibition will increase the pore space in shale; ③ The imbibition capacity is positively correlated with the porosity and permeability of shale, and the physical properties of shale are significantly improved after imbibition. In addition, the time index is found to be able to quantitatively characterize the influence of imbibition on the pore-throat connectivity of shale.

Key words: shale gas reservoir, fracture, water phase imbibition, physical and chemical effect, microscope structure of pore

CLC Number:

TE341

Ying LI,Maomao LI,Haitao LI, et al. Physicochemical mechanism of water phase imbibition in shale reservoirs[J]. Reservoir Evaluation and Development, 2023, 13(1): 64-73.

Figures/Tables 18

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Table 2

Table 3

Table 4

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Table 5

Parameters and time index of shale samples with different sizes"

编号	长度（cm）	直径（cm）	$A c M$ （cm²/g）	n
CN1-1-1	1.01	2.53	0.41	0.365
CN1-2	3.04	2.54	0.13	0.344
CN2-1-1	1.00	2.53	0.40	0.336
CN2-2	1.93	2.52	0.20	0.360
YN-1-1	0.84	2.51	0.45	0.560
YN-2	1.78	2.53	0.21	0.470
CQ-1-1	0.84	2.54	0.44	0.402
CQ-3	2.88	2.55	0.13	0.378

Table 5

Table 6

Time index changes of shale samples with repeated imbibition"

编号	长度（cm）	直径（cm）	$A c M$ （cm²/g）	n
CN1-1-2	1.01	2.53	0.41	0.429
CN2-1-2	1.00	2.53	0.40	0.440
YN-1-2	0.84	2.51	0.45	0.630
CQ-1-2	0.84	2.54	0.44	0.540

Table 6

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编号	形状	体积（cm³）	质量（g）	边界条件	微观孔隙结构观测方法
CN1小岩块	近似长方体	约0.4	1.081 8	AFO	SEM
CN2小岩块		约0.4	1.124 4	AFO	SEM
YN小岩块		约0.3	0.676 6	AFO	SEM
CQ小岩块		约0.4	1.054 4	AFO	SEM

编号	单位岩石质量渗吸量（%）	黏土矿物含量（%）	孔隙度（%）	渗透率（10^-3μm²）	长度（cm）
CN1-1-1	2.163	15.8	3.98	0.000 415	1.01
CN2-1-1	1.460	14.4	3.29	0.000 113	1.00
YN-1-1	1.902	35.1	3.48	0.000 338	0.84
CQ-1-1	0.928	29.3	1.92	0.000 055	0.84

Physicochemical mechanism of water phase imbibition in shale reservoirs

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样品	编号	长度（cm）	直径（cm）	边界条件
CN1区块	CN1-1-1	1.01	2.53	TEO
	CN1-1-2	1.01	2.53	重复渗吸
	CN1-2	3.04	2.54	TEO
CN2区块	CN2-1-1	1.00	2.53	TEO
	CN2-1-2	1.00	2.53	重复渗吸
	CN2-2	1.93	2.53	TEO
YN区块	YN-1-1	0.84	2.51	TEO
	YN-1-2	0.84	2.51	重复渗吸
	YN-2	1.78	2.53	TEO
CQ区块	CQ-1-1	0.84	2.54	TEO
	CQ-1-2	0.84	2.54	重复渗吸
	CQ-2	1.92	2.55	TEO
	CQ-3	2.88	2.55	TEO
致密砂岩	S-1	3.35	2.52	TEO
	S-1-2	3.35	2.52	重复渗吸
	S-2	4.91	2.52	TEO

编号	长度（cm）	直径（cm）	边界条件	微观孔隙结构观测方法
CN1-3	3.04	2.52	AFO	核磁共振
CN2-3	3.03	2.52	AFO	核磁共振
YN-3	3.00	2.52	AFO	核磁共振
CQ-4	2.77	2.55	AFO	核磁共振

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