地球科学进展

地球科学进展 ›› 2014, Vol. 29 ›› Issue (9): 1065 -1074. doi: 10.11867/j.issn.1001-8166.2014.09.1065

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中国长焰煤物性特征及其煤层气资源潜力
简阔 2( ), 傅雪海 1, 2, 3, 王可新 1, 2, 张玉贵 4   
  1. 1.中国矿业大学 资源与地球科学学院,江苏 徐州 221008
    2.中国矿业大学 煤层气资源与成藏过程教育部重点实验室,江苏 徐州 221008
    3.新疆大学地质与矿业工程学院,新疆维吾尔自治区 乌鲁木齐 830047
    4.河南理工大学 安全科学与工程学院,河南 焦作 454000
  • 收稿日期:2014-05-12 修回日期:2014-08-09 出版日期:2014-09-10
  • 基金资助:
    国家自然科学基金项目“新疆低煤级储层煤层气成藏模式研究”(编号:41362009);新疆维吾尔族自治区引进高层次人才及“天山学者”启动基金项目(编号:11100213)资助

Physical Characteristics and CBM Resources Potential of Long Flame Coal in China

Kuo Jian 1, 2( ), Xuehai Fu 1, 2, 3, Kexin Wang 1, 2, Yugui Zhang 4   

  1. 1． School of Resources and Geoscience, China University of Mining and Technology , Xuzhou,Jiangsu 221008,China
    2． Key Laboratory of Coalbed Methane Resources and Reservoir Formation Process ,Ministry of Education , China University of Mining and Technology, Xuzhou, Jiangsu 221008, China
    3． School of Geology and Mining Engineering, Xinjiang University, Xinjiang Uygur Autonomous Regions, Urumqi 830047, China
    4． School of Safety Science and Engineering, Henan Polytechnic University, Jiaozuo, Henan 454000, China
  • Received:2014-05-12 Revised:2014-08-09 Online:2014-09-10 Published:2014-09-10
全文 ( 8 ) 下载PDF ( 1480 )

为了评价我国长焰煤储层煤层气开发前景,对全国范围内的34个长焰煤煤样(测试18个/收集16个),进行了煤岩组分、平衡水分、工业分析和物性特征分析,以及等温吸附实验和煤表面能计算。结果表明:长焰煤的平衡水分、干燥无灰基挥发分、空气干燥基水分随煤化程度的增加而减少,孔隙率随煤化程度增大而增大,且孔容分布不均,以大孔最多,约占40%,孔比表面积以过渡孔和微孔占绝对优势,二者约占97%;长焰煤的朗缪尔体积随惰质组含量的增加而趋于增大,随镜质组含量的增加呈减少趋势,且煤表面能ΔγL和朗缪尔体积均随煤化程度的增加而增大,随温度的升高而减小,煤表面能对甲烷吸附控制作用明显。估算全国2 000 m以浅长焰煤煤层气资源量为4.3万亿m3,长焰煤孔隙率高,孔径结构分布连续,且连通性较好,其煤层气资源具有开发潜力。当前我国低煤级煤层气尚未取得规模性商业开发的突破,本文为低煤级煤层气开发提供了长焰煤储层的基础研究,指明了其物性特征及优势,梳理了不同区域的长焰煤煤层气资源,对低煤级中长焰煤煤层气开发具有一定指导意义。

关键词: 长焰煤煤层气, 孔径分布, 等温吸附, 煤表面能

In order to evaluate the development prospects of coalbed methane (CBM) of Long flame coal reservoirs, we analyzed the coal maceral, equilibrium moisture content, industry analysis and physical characteristics of 34 long flame coal samples (testing 18/collecting 16) nationwide. Moreover, Isothermal adsorption experiments and the calculation of coal surface energy were carried out. The results show that: equilibrium moisture, dry ash-free volatile and air-dried basis moisture of long flame coal decrease with increasing degree of coalification, but porosity increases with increasing degree of coalification. And the pore volume is unevenly distributed, the macropore accounts for most of the total volume (about 40%), the specific surface area of transition pore and micro pore has an absolute advantage (about 97%). Langmuir volume shows an increasing trend with increasing inertinite content, and shows an decreasing trend with increasing vitrinite content. Besides , both ΔγL and Langmuir volume increases with the increase of degree of coalification, and decreases with increasing temperature, so it is obvious that coal surface energy controls the action of methane adsorption. Nationwide, The CBM resources of long flame coal within the 2000m were estimated at 4.3×1012 m3.The porosity of long flame coal is larger, pore connectivity is better, and pore size distribution is continuous. Thus, the CBM resources of long flame coal has the development potential. At present, the low rank CBM development in our country has not yet achieved a breakthrough in the scale of commercial development. In this paper, we provided a basis for the study of long flame coal reservoir for low rank CBM development, pointed out its physical characteristics and advantages, and combed CBM resources of long flame coal located in different regions, which has certain guiding significance for CBM development of long flame coal in the low rank coal.

Key words: The coalbed methane of Long flame coal, Pore size distribution, Isothermal adsorption, Coal surface energy

中图分类号: 

表1 2 000 m以浅长焰煤煤层气资源量
Table 1 CBM resources of long flame coal within the 2 000m
赋煤区 煤层气资源量
/亿m3		 煤储层气含量*
/( m3/t)
准北
准南
准东
吐哈
伊犁
巴里坤―三塘湖
中天山
塔里木
鄂尔多斯保德
桌子山-贺兰山
海拉尔
二连		 9 331.82
5 473.14
742.50
11 063.60
5282.90
1 382.97
4 237.34
99.42
1.36
234.35
4 449
679.96**		 2.50~15.81
1.7~8.0
2.5~10.0
1.57~16.60
1.12~4.50
3.24~16.65
4.75~6.75
5~14.95
0~7.33
1.34~7.25
1.20~3.57
1.21~4.45
总计 42978.36
图1 Ro, max与 Mad, Vdaf的关系
Fig.1 The relation between Ro, max and Mad, Vdaf
表2 长焰煤煤岩工业分析、平衡水分(Me)及孔隙度测试结果
Table 2 Long flame coal rock identification, industry analysis, equilibrium moisture content(Me) and porosity test results
采样
地点		 编
号		 Ro,max
/%		 Me
/%		 工业分析 /% 煤岩显微组分
(%,去矿物基)		 真密度/
(g/cm3)		 视密度/
(g/cm3)		 孔隙率(φ)/％
Mad Ad Vdaf 镜质组 惰质组 稳定组
吐哈 TH-1
TH-2
TH-3
TH-4
TH-5
TH-6
TH-7
TH-8*
TH-9
TH-10
TH-11*		 0.50
0.53
0.54
0.54
0.55
0.56
0.56
0.57
0.65
0.65
0.65		 8.79
11.85
6.78
10.14
7.75
11.61
13.62
/
/
11.66
/		 4.31
6.69
3.61
3.37
4.63
7.74
10.78
2.59
3.84
/
4.74		 4.82
14.01
7.29
12.46
4.14
3.51
0.40
3.18
7.77
5.25
2.38		 43.47
40.25
47.55
44.15
40.69
39.76
38.07
34.50
41.72
29.36
23.73		 69.78
75.00
87.01
90.52
76.99
85.68
72.20
65.52
62.81
36.42
6.34		 26.17
18.48
2.89
1.81
17.72
10.79
24.69
20.53
31.20
59.05
87.51		 3.32
5.83
10.89
8.15
4.71
3.29
2.56
3.95
4.79
2.93
6.14		 1.31
1.43
1.34
1.42
1.36
1.35
/
1.41
/
/
1.46		 1.28
1.39
1.30
1.36
1.30
1.28
/
1.28
/
/
1.26		 2.29
2.80
2.99
4.23
4.41
5.19
/
9.22
/
/
13.70
准格尔 ZR-1*
ZR-2*
ZR-3*
ZR-4*
ZR-5
ZR-6
ZR-7
ZR-8
ZR-9*
ZR-10*
ZR-11*
ZR-12*		 0.51
0.53
0.54
0.54
0.54
0.57
0.58
0.59
0.59
0.60
0.62
0.64		 /
/
/
/
5.67
8.71
/
6.37
/
/
/
/		 6.53
6.64
6.77
8.86
3.63
3.45
10.48
1.93
/
2.50
1.10
3.14		 4.25
2.33
3.62
4.24
3.16
7.34
3.69
3.63
/
2.98
9.12
2.66		 /
/
/
/
32.39
31.53
/
39.07
/
/
/
/		 89.2
86.3
84.7
14.9
54.79
36.70
16.5
72.02
72.05
27.6
44.0
60.4		 1.2
6.1
3.7
83.1
40.21
60.30
79.5
25.10
25.1
66.9
49.0
39		 9.6
7.6
11.5
2.1
3.70
1.91
3.9
2.88
2.85
5.5
7.0
0.6		 /
/
/
/
/
/
/
1.27
/
/
/
/		 /
/
/
/
/
/
/
1.26
/
/
/
/		 /
7.23
/
/
/
/
/
0.79
8.13
4.33
3.25
8.09
陕北 SB-1
SB-2		 0.55
0.65		 /
/		 10.90
/		 4.98
4.97		 38.60
30.50		 53.01
55.11		 31.97
26.62		 15.02
18.27		 1.43
1.52		 1.31
1.43		 8.39
/
铁法 TF 0.64 8.87 4.37 19.78 30.68 94.65 4.60 0.75 / / /
伊犁 YL* 0.65 / / 4.92 27.60 14.29 79.18 6.54 1.57 1.38 12.10
海拉尔 HLR 0.60 7.68 3.63 8.16 46.42 94.30 0.50 5.20 1.38 1.10 20.29
老君庙 L 0.62 / 9.43 2.98 29.99 / / / / / 17.91
鄂尔多斯 E-1*
E-2*
E-3*
E-4*		 0.59
0.59
0.59
0.59		 /
/
/
/		 4.30
4.14
3.86
5.37		 5.89
7.19
12.63
10.90		 40.45
40.13
39.69
38.05		 83.1
71.0
51.9
50.9		 8.0
14.7
26.4
32.3		 6.7
13.0
17.3
14.6		 1.37
1.40
1.50
1.45		 1.30
1.30
1.41
1.30		 3.60
5.60
3.91
7.40
黄陵 HL* 0.61 / / / / 65.49 21.56 12.96 1.38 1.28 7.25
表3 长焰煤孔容特征
Table 3 The characteristics of Long flame coal pore volume
编号 比孔容/ ×10-4cm3/g Vt 孔容百分比/%
V1 V2 V3 V4 V1/Vt V2/Vt V3/Vt V4/Vt
TH-01
TH-02
TH-03
TH-04
TH-05
TH-06
ZR-5
ZR-6
ZR-7
ZR-8
SB-1
SB-2
HLR
L
TF		 201
203
191
234
212
222
236
446
176
218
583
751
273
306
120		 79
38
21
23
58
16
277
165
353
68
658
128
94
212
26		 187
178
177
144
212
238
411
50
328
210
394
31
26
56
317		 114
93
96
58
80
164
98
99
74
90
82
150
37
96
146		 581
512
485
459
562
640
1022
760
931
586
1717
1060
430
670
609		 34.60
39.65
39.38
50.98
37.72
34.69
23.09
58.68
18.90
37.20
33.95
70.85
63.49
45.67
19.70		 13.60
7.42
4.33
5.01
10.32
2.50
27.10
21.71
37.92
11.60
38.32
12.08
21.86
31.64
4.27		 32.19
34.77
36.49
31.37
37.72
37.19
40.22
6.58
35.23
35.84
22.95
2.92
6.05
8.36
52.05		 19.62
18.16
19.79
12.64
14.23
25.63
9.59
13.03
7.95
15.36
4.78
14.15
8.60
14.33
23.97
表4 长焰煤比表面积特征
Table 4 The characteristics of Long flame coal surface area
编号 孔比表面积(m2/g) St 孔比表面积百分比 (%)
S1 S2 S3 S4 S1/St S2/St S3/St S4/St
TH-01
TH-02
TH-03
TH-04
TH-05
TH-06
SB-1
ZR-5
ZR-7
ZR-8
TF		 0.0076
0.0074
0.0038
0.0074
0.0063
0.0060
0.6970
0.1840
0.0820
0.0051
0.0030		 0.1250
0.0653
0.0265
0.0437
0.0968
0.0240
0.7700
0.4100
0.6100
0.1023
0.0430		 3.5938
3.5100
3.7141
3.9888
4.1067
4.7880
6.6000
7.3700
5.4700
4.2323
6.8790		 5.2873
4.2358
4.4526
1.8240
3.7286
7.6260
3.8000
4.4400
3.4200
4.2190
6.4760		 9.0137
7.8185
8.1970
5.8639
7.9384
12.4440
11.8670
12.4040
9.5820
8.5587
13.4010		 0.08
0.09
0.05
0.13
0.08
0.05
5.87
1.48
0.86
0.06
0.02		 1.39
0.84
0.32
0.75
1.22
0.19
6.49
3.31
6.37
1.20
0.32		 39.87
44.89
45.31
68.02
51.73
38.48
55.62
59.42
57.09
49.45
51.33		 58.66
54.18
54.32
31.11
46.97
61.28
32.02
35.79
35.69
49.29
48.32
图2 Ro, max与孔隙率 φ的关系
Fig.2 The relation between Ro, max and φ
图3 Ro, max与比孔容的关系
Fig.3 The relation between Ro ,max and specific pore volume
图4 Ro, max与孔比表面积的关系
Fig.4 The relation between Ro, max and Pore specific surface area
图5 VL与 Me的关系( T=30 ℃)
Fig.5 The relation between VL and Me ( T=30 ℃)
图6 长焰煤等温吸附曲线( T=30 ℃)
Fig.6 Isothermal adsorption curve of long flame coal ( T=30 ℃)
图7 长焰煤显微组分与 VL的关系( T=30 ℃)
Fig.7 The relation between Long flame coal macerals and VL( T=30 ℃)
表5 30 ℃时等温吸附数据及煤表面能计算结果
Table 5 Isothermal adsorption data and coal surface energy calculation results at 30 ℃
编号 Ro,max/
％		 朗缪尔常数 ΔγL/(J/m2)
VL /
(cm3/g)		 PL /
(MPa)
TH-1
TH-2
TH-3
TH-4
TH-5
TH-6
ZR-5
ZR-6
ZR-8
SB-1
TF
HLR		 0.5
0.53
0.54
0.54
0.55
0.56
0.54
0.57
0.59
0.55
0.64
0.6		 9.72
8.96
8.2
11.67
12.17
8.14
13.15
16.78
20.35
20.74
13.93
19.97		 1.35
1.07
0.68
2.01
2.28
1
1.68
2.35
1.64
4.62
4.91
6.82		 0.0841
0.0894
0.0818
0.1552
0.1196
0.051
/
/
0.1854
/
/
0.0986
表6 不同温度下等温吸附数据及朗缪尔煤表面能计算结果
Table 6 Isothermal adsorption data and coal surface energy calculation results at different temperature
老君庙矿 30℃ 50℃ 70℃ 90℃
VL/(cm³/g)
PL/MPa
ΔγL/(J/m2)		 28.34
1.04
0.2714		 24.61
1.32
0.2512		 22.07
1.91
0.2393		 18.69
2.17
0.2144
图8 Ro,max与 VL, ΔγL的关系( T=30 ℃)
Fig.8 The relation between Ro,max and VL, ΔγL( T=30 ℃)
图9 温度与 VL, ΔγL的关系
Fig.9 The relation temperature between and VL, ΔγL
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