基于多元力学实验的深层页岩气储层岩石力学特征研究

doi:10.13809/j.cnki.cn32-1825/te.2025.03.007

Abstract

Abstract:

The southeastern Sichuan region is characterized by complex tectonic structures. The shale gas reservoir from the first member of the upper Ordovician Wufeng Formation to the Lower Silurian Longmaxi Formation is buried at considerable depths, which significantly affects the rock mechanical properties. However, systematic studies remain limited. This study focuses on the deep shale gas reservoir in the Lintanchang area of southeastern Sichuan. A series of mechanical experiments, including triaxial compressive tests, acoustic wave velocity measurements, tensile strength tests, and fracture toughness tests, were carried out. Based on the results of these multi-mechanical experiments, the rock mechanical properties of shale samples were analyzed, and a vertical mechanical property profile for a single well was established. With increasing temperature and pressure, the residual stress after fracture, Young’s modulus, and Poisson’s ratio of the deep shale samples showed an upward trend. The post-peak stress-strain curves exhibited more pronounced fluctuations. Acoustic wave velocities at the plunging end of the Lintanchang anticline were lower than those at the flanks. Young’s modulus and Poisson’s ratio values, corrected using a dynamic-static linear transformation, exhibited improved accuracy. The maximum load borne by the deep shale samples was less than 10 kN. Type Ⅰ and Type Ⅱ fractures displayed notable differences in propagation characteristics, and the degree of fracture penetration was greatly affected by sampling direction. The vertical mechanical profile of well T4 revealed that the bottom section of the first member of the Wufeng-Longmaxi Formation has higher Young’s modulus, lower Poisson’s ratio, and stronger brittleness, while the compressive and tensile strengths, as well as the fracture toughness index, remain relatively low. These mechanical properties show a weak compressive-tensile state, providing favorable conditions for reservoir stimulation. Thus, this interval represents an optimal target for future exploration and development.

Key words: southeastern Sichuan, Lintanchang area, deep shale gas reservoirs, multi-mechanical experiments, rock mechanical properties

CLC Number:

TE135

FENG Shaoke,XIONG Liang. Study on rock mechanical properties of deep shale gas reservoirs based on multi-mechanical experiments[J]. Petroleum Reservoir Evaluation and Development, 2025, 15(3): 406-416.

Figures/Tables 13

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References 25

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井号	样品号	小层	深度/m	围压/MPa	温度/℃	抗压强度/MPa	静态杨氏模量/GPa	静态泊松比
T2	T2-1	①	3 026.26	15	30	175.99	31.69	0.233
	T2-2	①	3 026.26	30	60	246.16	32.56	0.238
	T2-3	①	3 026.39	50	90	311.03	33.89	0.243
T3	T3-4	③	4 122.76	15	30	163.59	29.54	0.218
	T3-5	③	4 122.76	30	60	186.89	31.19	0.235
	T3-6	③	4 122.76	50	90	230.98	32.78	0.251
	T3-16	②	4 127.50	15	30	236.67	30.94	0.213
	T3-17	②	4 127.50	30	60	288.84	31.08	0.231
	T3-18	②	4 128.20	50	90	339.94	31.83	0.269
	T3-13	①	4 132.00	15	30	261.51	31.36	0.209
	T3-14	①	4 132.00	30	60	261.96	32.73	0.234
	T3-15	①	4 132.00	50	90	387.65	34.43	0.237
	T3-19	①	4 134.45	15	30	192.86	30.70	0.214
	T3-20	①	4 134.45	30	60	255.53	35.76	0.251
	T3-21	①	4 134.45	50	90	316.96	38.71	0.282
T4	T4-21	③	3 905.39	15	30	243.24	35.71	0.176
	T4-23	③	3 905.39	30	60	272.86	39.79	0.196
	T4-24	③	3 906.48	50	90	300.79	40.78	0.207
T5	T5-25	③	2 874.35	15	30	123.23	29.80	0.225
	T5-26	③	2 874.35	30	60	156.32	31.02	0.239
	T5-27	③	2 874.42	50	90	190.25	32.51	0.248
	T5-28	①	2 884.31	15	30	127.82	30.48	0.207
	T5-29	①	2 884.31	30	60	144.17	31.82	0.232
	T5-30	①	2 884.31	50	90	211.25	33.59	0.249

井号	样品号	小层	深度/m	密度/（g/cm³）	横波波速/（m/s）	纵波波速/（m/s）	动态杨氏模量/GPa	动态泊松比
T3	T3-S-1	③	4 119.66	2.61	2 884.27	4 778.90	29.33	0.286
	T3-S-2	③	4 120.77	2.58	2 692.43	4 730.85	27.82	0.240
	T3-S-3	③	4 120.94	2.69	2 582.43	5 172.92	33.55	0.166
	T3-S-4	③	4 121.55	2.71	2 733.53	5 259.15	35.24	0.185
	T3-S-5	③	4 122.06	2.56	2 636.15	4 417.48	24.47	0.277
	T3-S-6	③	4 122.76	2.56	2 668.44	4 457.61	24.95	0.279
	T3-S-7	②	4 127.18	2.46	2 602.04	4 343.69	22.77	0.280
	T3-S-8	②	4 127.52	2.41	2 518.65	4 351.35	22.11	0.252
	T3-S-9	①	4 130.09	2.45	2 764.54	4 426.19	23.96	0.320
	T3-S-10	①	4 132.04	2.45	2 664.92	4 507.86	24.30	0.269
T5	T5-S-11	⑤	2 859.97	2.44	2 444.68	4 397.21	22.55	0.224
	T5-S-12	④	2 868.44	2.61	3 054.44	5 074.42	32.98	0.284
	T5-S-13	③	2 880.05	2.71	2 680.25	4 809.55	29.97	0.225
	T5-S-14	②	2 881.59	2.69	2 931.65	4 902.47	31.74	0.278
	T5-S-15	①	2 884.19	2.61	3 359.14	5 498.88	37.45	0.298

井号	样品号	小层	深度/m	最大载荷/kN	抗拉强度/MPa
T2	T2-L-1	③	3 011.01	3.721	4.41
	T2-L-2	②	3 023.96	5.237	4.98
	T2-L-3	①	3 025.56	5.719	5.04
T3	T3-L-4	⑦	4 090.76	5.005	5.31
	T3-L-5	③	4 120.81	2.752	3.89
	T3-L-6	②	4 128.95	4.083	4.81
	T3-L-7	①	4 130.25	3.756	4.28
T5	T5-L-8	⑤	2 856.05	3.262	3.58
	T5-L-9	④	2 868.44	2.469	2.99
	T5-L-10	③	2 871.72	2.455	2.71
	T5-L-11	②	2 881.59	4.194	4.80
	T5-L-12	①	2 884.19	3.596	4.03

井名	深度/m	小层	取样方向	与页理方向的关系	K_Ⅰ/（MPa·m^0.5）	K_Ⅱ/（MPa·m^0.5）
T2	3 011.00	③	轴向（0°）	平行	0.145
T2	3 016.58	③	轴向（0°）	平行		0.369
T3	4 122.76	③	轴向（0°）	平行	0.241	0.285
	4 126.41	③	径向（90°）	垂直	0.212	0.243
	4 127.30	②	径向（90°）	垂直	0.412	0.697
	4 128.20	②	轴向（0°）	平行	0.538	0.819
T4	3 907.54	③	径向（90°）	垂直	0.483	0.612
	3 905.31	③	轴向（0°）	平行	0.584	0.635
	3 917.57	①	径向（90°）	垂直	0.526	0.651
	3 917.79	①	轴向（0°）	平行	0.582	0.705
T5	2 877.49	③	径向（90°）	垂直	0.515	0.712
	2 878.89	③	轴向（0°）	平行	0.631	0.841
	2 880.76	②	径向（90°）	垂直	0.566	0.832
	2 881.59	②	轴向（0°）	平行	0.728	0.937

Study on rock mechanical properties of deep shale gas reservoirs based on multi-mechanical experiments

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