温-压耦合作用下深层盐岩盖层封闭能力演化特征

doi:10.11743/ogg20230520

Abstract

Abstract:

Three sets of experiments， including constant temperature-variable-pressure， variable temperature-constant pressure， and temperature-pressure coupling， were executed to simulate the influence of temperature and pressure conditions on the evolution of salt rock cap sealing ability using the experimental device of high temperature and high pressure triaxial rock mechanics testing system on salt rock samples from Jintan Salt Cave， China. The results indicate that： ① The coupling effect of temperature and pressure leads to a significant reduction in short-term strength， significant enhancement of plasticity of salt rock， and shortening of brittle-to-plastic transition time. The percentage （T_i ） of short-term strength reduction of salt rock caused by temperature is greater than 35.06 % while the maximum short-term strength reduction percentage （P_i ） of salt rock caused by pressure is only 38.25 %， indicating that the mechanical properties of salt rock are mainly controlled by temperature during the burial process. ② Under a single pressure， salt rock fractures have a trend of gradually decreasing and healing； while under the coupling of temperature and pressure， the salt rock will experience a phenomenon of “re-cracking”， with pressure dominating the low temperature stage （temperature < 90 ℃） and temperature dominating the high temperature stage （temperature ≥ 90 ℃）， resulting in creep damage to the salt rock. ③ An evolutionary model of “brittleness—brittleness-plasticity—plasticity—creep damage—damage healing” was established for deep salt rocks. Under the coupling of temperature and pressure， the creep damage stage is extremely unfavorable for the preservation of oil and gas reservoirs under high temperature conditions. Therefore， accurately determining the evolution characteristics of salt rock sealing ability can provide a theoretical basis for analyzing the enrichment patterns of deep pre-salt oil and gas reservoirs.

Key words: temperature-pressure coupling, triaxial stress-strain experiment, brittle-plastic transition, thermal damage, sealing capacity evolution, deep salt caprock

CLC Number:

TE122.2

Shan ZHAO, Hua LIU, Xianzhang YANG, Yongfeng ZHU, Shen WANG, Ke ZHANG, Xin WEI. Evolutionary characteristics of sealing capacity of deep salt caprocks under temperature-pressure coupling[J]. Oil & Gas Geology, 2023, 44(5): 1321-1332.

Figures/Tables 14

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实验项目	样品编号	围压/MPa	设定温度/℃	样品质量/g	高度/mm	直径/mm
恒温变压	S1	5	20	52.84	50.49	24.91
	S2	10	20	53.39	50.05	24.88
	S3	30	20	52.55	50.11	24.98
	S4	60	20	52.33	50.11	25.05
	S5	80	20	52.54	50.59	24.92
恒压变温	S6	20	40	—	—	—
	S7	20	60	—	—	—
	S8	20	80	—	—	—
	S9	20	100	—	—	—
温-压耦合	S10	5	30	53.91	50.07	24.86
	S11	10	40	52.73	50.11	24.90
	S12	30	85	53.13	50.54	24.94
	S13	60	150	52.50	50.07	24.94

实验条件	样品编号	围压/MPa	温度/℃	盐岩强度/MPa
恒温变压	S1	5	20	35.35*
	S2	10	20	43.57
	S3	30	20	41.07
	S4	60	20	37.50
	S5	80	20	29.64
恒压变温	S6	20	40	30.83
	S7	20	60	27.42
	S8	20	80	22.76
	S9	20	100	17.09
温-压耦合	S10	5	30	35.59
	S11	10	40	31.19
	S12	30	85	13.90
	S13	60	150	10.84

项目	样品编号	围压/ MPa	温度/ ℃	弹性模量（E）/ GPa	峰值后软化模量（M） / GPa	BDI
恒温变压	S1	5	20	3.73	-2.06	0.36
	S2	10	20	2.59	3.41	4.13
	S3	30	20	2.28	2.75	5.90
	S4	60	20	1.51	1.79	6.42
	S5	80	20	1.41	1.56	10.52
温-压耦合	S10	5	30	1.98	2.28	7.46
	S11	10	40	1.80	2.01	9.61
	S12	30	85	1.10	1.22	10.15
	S13	60	150	0.39	0.43	11.02

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Evolutionary characteristics of sealing capacity of deep salt caprocks under temperature-pressure coupling

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