川南煤田古叙矿区DC⁃5井上二叠统龙潭组煤层甲烷吸附性及其主控因素

doi:10.11764/j.issn.1672-1926.2019.10.011

Abstract

Abstract:

Research on the absorbability of coalbed methane is of importance for guiding the exploration and exploitation of coalbed methane and revealing the storage mechanism of coalbed methane. This study investigates the coal quality and methane adsorption capacity at different depth of the Longtan Formation in the Guxu mine area of southern Sichuan Coalfield by drilling sampling, coal rock and coal analysis, and methane isothermal adsorption testing. The main geological factors affecting methane adsorption capacity are analyzed using a multiple linear stepwise regression method. Results show that the coal rank of the Longtan Formation in the Guxu mine area has reached the anthracite stage (R_{o, max} ranges from 2.83% to 3.22%), which belongs to high-rank coals. Vitrinite is the main component of coal maceral and followed by inertinite without exinite. Clay mineral is the main component of the inorganic mineral. The difference of moisture and volatile matter contents between coal seams in the Longtan Formation is small, while a large difference between ash and fixed carbon contents is observed. Langmuir volume (V_L) of different coal seams ranges from 11.39 to 25.06 m³/t. Fixed carbon content is the main factor affecting the methane adsorption capacity of the coal seams in the Guxu mine area. The content of fixed carbon is positively correlated with the methane adsorption quantity.

Key words: Methane adsorption, Constraint, Longtan Formation, Guxu mine area, South Sichuan Coalfield

CLC Number:

TE122.2

Yuan BAO, Chao AN, Yi-wen JU, Zhong-shan YIN, Jian-long XIONG, Wen-bo WANG. Constraints of methane absorbability in the Upper Permian Longtan Formation of Well DC-5 in Guxu mine area of southern Sichuan Coalfield[J].Natural Gas Geoscience, 2020, 31(1): 93-99.

Figures/Tables 10

Fig.1

Fig.2

Table 1

Table 2

Result of coal proximate analysis"

样品编号	原煤工业分析/%				发热量/ （MJ/kg）	全硫/%
样品编号	M_ad	A_d	V_d	FC_d	发热量/ （MJ/kg）	全硫/%
C₁₄	2.20	50.85	9.43	37.52	14.33	0.14
C₁₆	1.77	10.46	6.38	81.39	30.65	0.22
C_17-1	2.16	28.03	7.97	61.84	23.02	0.37
C_17-2	2.19	12.04	6.31	79.46	/	/
C₂₃	2.40	32.89	8.33	56.38	21.13	0.59
C₂₄	1.82	28.12	6.95	63.11	23.66	0.38
C_25-1	2.11	44.15	8.41	45.33	17.08	3.64
C_25-3	2.26	12.70	6.94	78.10	/	/
C_25-4	1.81	30.84	8.10	59.25	/	/
C₁₃^a	$0.48 ~ 0.92 0.70 ? (37)$	$17.13 ~ 38.69 26.44 (40)$	$6.81 ~ 9.35 8.08 (37)$	$60.79 ~ 68.43 64.61$	$21.07 ~ 29.18 25.68 (37)$	$0.31 ~ 3.26 2.66 (38)$
C₁₄^a	$0.67 ~ 1.48 0.95 (42)$	$14.33 ~ 39.15 24.04 (46)$	$6.43 ~ 8.42 7.61 (40)$	$52.31 ~ 67.96 62.81$	$20.53 ~ 30.11 26.39 (38)$	$0.19 ~ 1.86 0.85 (44)$
C₁₆^a	$0.64 ~ 1.40 0.95 (14)$	$16.52 ~ 35.38 23.11 (14)$	$6.23 ~ 7.53 6.73 (14)$	$44.39 ~ 77.47 60.31$	$20.74 ~ 29.67 25.40 (14)$	$0.16 ~ 1.67 0.57 (13)$
C₁₇^a	$0.66 ~ 1.30 0.91 (37)$	$15.44 ~ 36.84 23.93 (41)$	$5.98 ~ 10.81 7.96 (37)$	$43.23 ~ 73.79 59.39$	$20.87 ~ 29.69 26.33 (37)$	$0.18 ~ 1.62 0.94 (41)$
C₂₃^a	$0.42 ~ 1.23 0.77 (47)$	$10.75 ~ 39.22 22.60 (47)$	$6.44 ~ 8.77 7.77 (47)$	$6.25 ~ 67.61 62.57$	$19.84 ~ 31.69 26.48 (47)$	$0.54 ~ 3.86 2.74 (46)$
C₂₄^a	$0.34 ~ 1.34 0.77 (37)$	$12.37 ~ 39.90 24.73 (37)$	$5.93 ~ 8.44 7.40 (35)$	$66.22 ~ 70.75 68.02$	$20.25 ~ 31.73 27.41 (35)$	$0.93 ~ 7.94 2.52 (35)$
C₂₅^a	$0.33 ~ 0.83 0.55 (39)$	$9.47 ~ 38.24 18.26 (43)$	$6.78 ~ 12.10 8.85 (38)$	$54.91 ~ 76.97 64.15$	$20.31 ~ 32.18 28.44 (39)$	$1.49 ~ 7.59 4.47 (42)$

Table 2

Fig.3

Table 3

Table 4

Table 5

Fig.4

Fig.5

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样品编号	采样埋深 /m	镜质体反射率（R_O,max）/%	煤岩显微组分/%				煤体结构类型
样品编号	采样埋深 /m	镜质体反射率（R_O,max）/%	镜质组	壳质组	惰质组	无机矿物（黏土类）	煤体结构类型
C₁₄	726.9	2.96	42.5	0.0	9.8	47.7（41.7）	糜棱煤
C₁₆	741.2	3.14	73.9	0.0	15.8	10.3（6.6）	碎裂煤
C_17-1	746.6	2.94	76.9	0.0	9.6	13.5（8.6）	碎裂煤
C_17-2	747.8	3.16	46.2	0.0	47.8	6.0（3.2）	碎裂煤
C₂₃	758.3	2.92	70.3	0.0	9.4	20.3（12.0）	糜棱煤
C₂₄	763.7	3.22	74.1	0.0	10.3	15.6（4.7）	碎裂煤
C_25-1	775.7	3.08	41.6	0.0	11.4	47.0（35.1）	糜棱煤
C_25-3	777.4	2.83	63.2	0.0	15.7	21.1（14.1）	碎裂煤
C_25-4	779.5	3.13	69.0	0.0	11.3	19.7（12.5）	碎裂煤
C₁₁^a	/	2.64	56.2	0.0	17.4	26.4（/）	/
C₁₇^a	/	2.66	72.8	0.0	6.2	21.0（/）	/
C₁₉^a	/	2.64	67.7	0.0	25.4	6.9（/）	/
C₂₃^a	/	2.61	68.3	0.0	18.2	13.5（/）	/
C₂₅^a	/	2.63	71.1	0.0	17.3	11.6（/）	/

样品编号	Langmuir模型
样品编号	V_L/(m³/t)	P_L/MPa
C₁₄	11.39	1.22
C₁₆	21.79	0.97
C_17-1	18.25	1.01
C_17-2	25.06	1.05
C₂₃	16.18	1.06
C₂₄	21.88	1.17
C_25-1	16.03	1.15
C_25-3	24.69	1.41
C_25-4	21.98	1.04

	采样埋深	镜质体反射率	镜质组	惰质组	无机矿物	黏土类	煤体结构类型	M_ad	A_d	V_d	FC_d
相关性	0.418	0.308	0.332	0.551	-0.773	-0.785	-0.852	-0.329	-0.889	-0.895	0.895
显著性	0.262	0.42	0.383	0.124	0.015	0.012	0.004	0.387	0.001	0.001	0.001
是否显著					显著	显著	显著		显著	显著	显著

	非标准化系数		t	Sig.	B的95.0%置信区间
	B	标准误差	t	Sig.	下限	上限
(常量)	3.016	3.221	0.936	0.380	-4.600	10.632
固定碳含量	0.267	0.050	5.313	0.001	0.148	0.386

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Constraints of methane absorbability in the Upper Permian Longtan Formation of Well DC-5 in Guxu mine area of southern Sichuan Coalfield

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