鄂尔多斯盆地东部深部煤系储层微观孔隙结构特征及启示

doi:10.13809/j.cnki.cn32-1825/te.2025.02.006

Abstract

Abstract:

The deep coalbed methane resources in the eastern Ordos Basin are abundant, and comprehensive development of coal measure gas can enhance resource utilization and improve single well gas production. To precisely identify the “sweet spot layer,” this study compares the pore development characteristics of coal measure mudstone, coal rock and tight sandstone in the Shan 2 Section of the Shanxi Formation in the eastern Ordos Basin using organic geochemical analysis, dual-beam scanning electron microscopy, high-pressure mercury intrusion, low-temperature N₂ adsorption, and low-temperature CO₂ adsorption tests. The results show that clay mineral content is the main factor influencing pore development in coal measure mudstone and tight sandstone. The microscopic pore structure of coal measure reservoirs exhibits significant variations: mudstones and tight sandstones are characterized by mesopores (2-50 nm) within clay minerals, with their mesopore-specific surface area and pore volume being roughly equal. Coal develops abundant micropores (<2 nm) in organic nanopores, with a micropore-specific surface area far exceeding the mesopore-specific surface area of mudstone and tight sandstone. Tight sandstone also develops numerous macropores (>50 nm) in clay mineral pores and microfractures, exhibiting better connectivity than mudstone. Tight sandstone provides substantial storage space for free gas, while the pores in mudstone and coal can adsorb a large amount of natural gas. The sand-mud-coal and sand-coal combinations are the main exploration targets for coal measure strata.

Key words: deep coal measure gas, pore structure, reservoir characteristics, pore differences, Ordos Basin

CLC Number:

TE135

MA Litao,WU Peng,YANG Jianghao, et al. Microscopic pore structure characteristics and implications of deep coal measure reservoirs in eastern Ordos Basin[J]. Petroleum Reservoir Evaluation and Development, 2025, 15(2): 217-226.

Figures/Tables 10

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样品编号	深度/m	亚段	岩性	ω（TOC）/%	R_o/%	含气量/（m³/t）
M5-1	1 919.35	山2¹	深灰色粉砂质泥岩	0.54	1.37	0.19
M5-2	1 920.25	山2¹	黑色炭质泥岩	1.91	1.36	0.35
M5-3	1 923.06	山2¹	煤	77.30		6.52
M5-4	1 927.42	山2¹	灰色中粒岩屑砂岩		1.25	0.09
M5-5	1 930.63	山2²	煤	81.60	1.39	6.31
M5-6	1 935.27	山2²	黑色泥质粗粉砂岩			0.40
M5-7	1 938.56	山2²	深灰色细粒岩屑砂岩			0.50
M5-8	1 939.29	山2²	灰色中粒岩屑砂岩			0.47
M5-9	1 939.92	山2²	灰色细粒岩屑砂岩			0.35
M5-10	1 941.33	山2²	灰色粗粒岩屑砂岩			0.20
M5-11	1 942.56	山2³	煤	76.70	1.47	6.96
M5-12	1 947.26	山2³	黑色细粒岩屑砂岩			0.18
M5-13	1 947.76	山2³	灰黑色含粗粉砂泥岩	2.53	1.47	0.07
M5-14	1 948.21	山2³	灰色含粗粉砂泥岩	1.80	1.39	0.14
M5-15	1 949.35	山2³	灰色细粒岩屑砂岩	0.59	1.36	0.26
M5-16	1 949.86	山2³	灰色细粒岩屑砂岩	7.18	1.40	0.30
M5-17	1 950.25	山2³	灰色粗粒岩屑砂岩	2.37	1.39	0.27
M5-18	1 950.72	山2³	灰色中粒岩屑砂岩	6.12	1.44	0.08
M5-19	1 951.10	山2³	灰色中粒岩屑砂岩	11.10	1.37	0.16
M5-20	1 951.62	山2³	灰色不等粒岩屑砂岩	8.58	1.40	0.31

样品编号	单元划分	BET比表面积/(m²/g)	BJH孔体积/(cm³/g)	平均孔直径/nm
M5-1	山2¹	10.40	0.023 2	9.96
M5-2	山2¹	4.30	0.015 9	14.55
M5-3	山2¹	0.63	0.002 8	22.11
M5-4	山2¹	9.12	0.026 9	11.99
M5-5	山2²	0.81	0.003 4	18.65
M5-6	山2²	6.28	0.018 6	12.31
M5-7	山2²	4.77	0.016 0	13.07
M5-8	山2²	4.43	0.014 4	12.79
M5-9	山2²	3.28	0.012 6	14.36
M5-10	山2²	2.30	0.012 2	18.81
M5-11	山2³	0.71	0.003 3	22.04
M5-12	山2³	4.40	0.015 2	14.25
M5-13	山2³	4.25	0.013 4	13.96
M5-14	山2³	5.64	0.017 4	12.83
M5-15	山2³	5.69	0.018 3	12.96
M5-16	山2³	2.05	0.009 9	17.18
M5-17	山2³	3.88	0.015 4	15.12
M5-18	山2³	8.62	0.026 4	12.09
M5-19	山2³	7.68	0.023 8	12.50
M5-20	山2³	2.90	0.014 7	17.17

Microscopic pore structure characteristics and implications of deep coal measure reservoirs in eastern Ordos Basin

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