深/浅部煤储层孔裂隙结构及三维空间分布差异特征

doi:10.13809/j.cnki.cn32-1825/te.2025.02.007

Abstract

Abstract:

The differences in pore-fracture structures between deep and shallow coal reservoirs significantly affect coalbed methane extraction. Research on these structural differences provides theoretical support for exploring their physical properties and identifying favorable zones for coalbed methane exploration and development. This study analyzed coal samples from deep and shallow coal reservoirs in the Junggar Basin. These samples were tested using scanning electron microscopy, low-temperature N₂ adsorption, high-pressure mercury injection, and CT scan. The results showed that, from shallow to deep coal samples, the permeability, total pore volume, and distribution frequency of micropores and macropores gradually decreased. The shallow coal samples exhibited well-developed pores and fractures, with low fractal dimensions in the mesopore and macropore stages, strong homogeneity in pore development, and interconnection between macropores and microfractures. In contrast, the deep coal samples showed relatively isolated pore-fracture development, more complex pore development in the mesopore and macropore stages, and significant mineral filling within pores and fractures. A pore network model for the samples was established using the maximal sphere algorithm to analyze the distribution pattern, morphology, and three-dimensional structural development of the connected pores and fractures. The equivalent pores, throat parameters, and other structural parameters, along with the connectivity, were statistically analyzed. The results revealed that shallow coal samples showed higher connectivity and total porosity compared to the deep samples. The shallow samples exhibited more pores and fractures, with a dominance at the microfracture scale. Additionally, they exhibited shorter throats, larger pore-throat radii, denser pore development, higher coordination numbers, and better connectivity, which facilitated gas flow in the reservoir. The research findings provide experimental data support for the development of deep and shallow coalbed methane in the Junggar Basin using adaptive technologies, and offer valuable guidance for on-site development.

Key words: Junggar Basin, deep coalbed methane, pore characteristics, physical properties, CT scan

CLC Number:

TE132

WANG Pengxiang,ZHANG Zhou,YU Wanying, et al. Characteristics of pore-fracture structure and three-dimensional spatial distribution differences in deep and shallow coal reservoirs: A case study of Junggar Basin[J]. Petroleum Reservoir Evaluation and Development, 2025, 15(2): 227-236.

Figures/Tables 12

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样品编号	采样位置	去矿物基显微组分体积分数/%			工业分析组分质量分数/%				常量元素质量分数/%					渗透率/ 10^-3 μm²
样品编号	采样位置	镜质组	惰质组	壳质组	M_ad	A_ad	V_daf	FC_ad	ω（N）	ω（C）	ω（H）	ω（S）	ω（O）	渗透率/ 10^-3 μm²
QG	深部	45.56	53.67	0.77	3.87	2.59	25.68	67.86	0.52	78.33	4.16	0.07	12.43	0.022
DN	深部	75.33	23.68	0.99	2.87	2.92	41.24	52.97	0.75	75.83	5.56	0.13	12.12	0.013
KG	浅部	12.55	86.61	0.84	5.74	1.27	21.30	71.69	1.37	78.19	3.78	0.05	10.21	0.097
LHG	浅部	21.20	78.00	0.80	9.85	1.98	23.76	64.41	0.04	71.25	3.46	0.03	13.95	0.149

样品编号	采样位置	相对压力（p/p₀）小于0.5			相对压力（p/p₀）大于0.5
样品编号	采样位置	拟合函数	D₁	R²	拟合函数	D₂	R²
QG	深部	y＝-0.763 6x－3.346 4	2.236 4	0.950 9	y＝-0.338 2x－3.318 5	2.661 8	0.993 0
DN	深部	y＝-0.452 4x－0.216 0	2.547 6	0.978 1	y＝-0.277 7x－0.103 4	2.722 3	0.978 1
KG	浅部	y＝-0.366 6x＋1.078 7	2.633 4	0.965 7	y＝-0.144 0x＋1.095 7	2.855 9	0.997 8
LHG	浅部	y＝-0.356 8x＋1.327 0	2.643 2	0.921 5	y＝-0.136 3x＋1.292 9	2.863 7	0.993 1

样品编号	采样位置	大孔			中孔
样品编号	采样位置	拟合函数	D₃	R²	拟合函数	D₄	R²
QG	深部	y＝0.070 8x－3.852 2	2.929 2	0.959 7	y＝0.033 9x－3.864 7	2.966 1	0.991 0
DN	深部	y＝0.098 7x－3.786 0	2.901 3	0.954 9	y＝0.140 9x－3.795 6	2.859 1	0.992 0
KG	浅部	y＝0.218 0x－4.667 2	2.782 0	0.990 2	y＝0.512 8x－4.732 8	2.487 2	0.995 5
LHG	浅部	y＝0.407 2x－3.936 0	2.592 8	0.985 7	y＝0.559 3x－4.013 1	2.440 7	0.996 5

样品编号	孔径	等效孔隙数量	平均孔隙等效直径/μm	累计孔隙等效直径/μm	孔喉长度/μm	孔喉数量	平均孔喉长度/μm	累计孔喉长度/μm	有效配位数
DN	<5	226	1.91	432	<50	0	0	0	80
	5~<10	62	6.46	401	50~<100	5	78.8	394
	10~<20	23	13.26	305	100~<200	45	157.6	7 094
	20~<30	15	25.20	378	200~<300	35	256.8	8 989
	30~50	33	39.51	1 304	300~500	40	381.6	15 265
	>50	36	69.30	2 498	>500	5	587.4	2 937
QG	<5	127	2.39	304	<50	10	36.6	366	227
	5~<10	44	7.04	310	50~<100	50	78.2	3 908
	10~<20	101	14.70	1 485	100~<200	97	145.2	14 087
	20~<30	58	24.70	1 437	200~<300	98	246.3	24 139
	30~50	43	36.48	1 569	300~500	91	378.3	34 430
	>50	28	83.03	2 325	>500	27	589.3	15 912
KG	<5	0	0	0	<50	229	35.9	8 242	972
	5~<10	136	7.61	1 036	50~<100	157	78.6	12 347
	10~<20	302	17.63	5 327	100~<200	84	139.2	11 694
	20~<30	81	23.03	1 866	200~<300	27	274.7	7 418
	30~50	15	34.80	522	300~500	19	332.0	6 314
	>50	5	57.80	289	>500	7	539.5	3 777
LHG	<5	0	0	0	<50	200	35.1	7 019	878
	5~<10	255	8.30	2 119	50~<100	140	69.5	9 731
	10~<20	517	13.62	7 046	100~<200	84	143.2	12 028
	20~<30	79	23.36	1 846	200~<300	41	248.1	10 174
	30~50	21	37.00	777	300~500	42	383.7	16 118
	>50	10	79.20	792	>500	46	669.0	30 774

Characteristics of pore-fracture structure and three-dimensional spatial distribution differences in deep and shallow coal reservoirs: A case study of Junggar Basin

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