Syncline-confined-water Model of Coalbed Methane Enrichment Area in Liuhuanggou Mining Area, Southern Junggar Coalfield

doi:10.19657/j.geoscience.1000-8527.2019.017

Abstract

Abstract:

Through systematic collection and analysis of the latest exploration data and existing coal mine production data, controlling factors on the coal rank, structure, hydrology, and caprock enrichment of coalbed methane in Liuhuanggou mining area, Southern Junggar coalfield are studied. The results show that the multiphase tectonic activity might cause the formation of the Akede syncline and the reverse fault on its northern limb. The delta plain swamp controls the development of thick coal seams, and the fan delta, fluvial and lacustrine facies control the lower caprock layer, and the burning-zone weak runoff groundwater dynamic system blocks the coalbed methane. These factors jointly control the enrichment model of the syncline-confined coalbed methane in Liuhuanggou area. It is considered that the Akede synclinal axis, featured by its deep burial depth, high-salinity groundwater and closed caprock conditions, is the most favorable enrichment zone for coalbed methane.

Key words: coalbed methane, groundwater in syncline, enrichment model, Liuhuanggou mining area

CLC Number:

P618.11

GAO Beidou, WANG Haichao, TIAN Jijun, HAN Xu, FENG Shuo, WANG Di, ZHANG Zhendong. Syncline-confined-water Model of Coalbed Methane Enrichment Area in Liuhuanggou Mining Area, Southern Junggar Coalfield[J]. Geoscience, 2020, 34(02): 281-288.

Figures/Tables 11

Fig.1 Structural map of Liuhuanggou mining area

Table 1 Coal seam statistics of Liuhuanggou mining area

煤矿	大陆煤矿	恒安煤矿	宝平煤矿	城郊第二煤矿	寿安煤矿	益安煤矿	忠兴煤矿	红星煤矿
煤层厚度/m	40.14	25.89	39.94	46.10	40.49	23.78	40.59	33.65
煤层数量/层	11~18	3	15~18	4~9	15~18	18	15~18	4~8

Fig.2 Stratigraphic column of Liuhuanggou mining area

Table 2 Statistics of microscopic coal compositions in Liuhuanggou mining area

矿区	显微煤岩类型	镜质组/%	惰质组/%	壳质组/%	有机质含量/%	镜质组反射率/%
硫磺沟宝亿煤矿	亮暗煤	62.30	26.00	2.80	91.10	0.50
硫磺沟煤矿四井田	微镜惰煤	82.35	16.61	1.00	99.96	0.53
硫磺沟三井田	亮煤型	79.90	6.20	3.40	89.50	0.52
昌吉监狱煤矿	微镜惰煤	74.82	23.70	0.58	99.10	0.48
昌吉市阿苏萨依煤矿	微镜惰煤	71.35	22.65	1.83	95.83	0.56
平均值		74.14	19.03	1.92	95.10	0.52

Fig.3 Relation between gas content and depth of coalbed in Liuhuanggou mining area

Fig.4 Relation between gas content and coal rank of coalbed in Liuhuanggou mining area

Fig.5 Relationship between structural assemblage pattern (a) and gas content of coal reservoirs (b) in Liuhuanggou mining area

Fig.6 Contour map of coal seam thickness of the Xishanyao Formation in Liuhuanggou mining area

Fig.7 Lithology of the roof of the main coal seam in Liuhuanggou mining area and its proportion

Table 3 Water quality data of coal bed groundwater in Liuhuanggou mining area

矿区	水化学类型	pH值	矿化度/(mg/L)
宝平煤矿	Cl^-·S $O 4 2 -$ —(K⁺+Na⁺)、Ca²⁺	7.5	10 592
文华煤矿	Cl^-·S $O 4 2 -$ —K⁺·Na⁺	7.9	7 532
昌吉监狱煤矿	Cl^-·S $O 4 2 -$ —K⁺·Na⁺	7.9	7 532
益安煤矿	Cl^-· HC $O 3 -$ ·SO₄ ^2-—K⁺·Na⁺	8.0	3 000
寿安煤矿	Cl^-·S $O 4 2 -$ —K⁺·Na⁺	8.0	10 292
红岩煤矿	Cl^-·HC $O 3 -$ ·S $O 4 2 -$ —K⁺·Na⁺	8.0	9 572
阿苏萨依煤矿	HC $O 3 -$ ·S $O 4 2 -$ —Na⁺·Ca²⁺	7.45~8.0	502.4~646.0

Table 3 Water quality data of coal bed groundwater in Liuhuanggou mining area

矿区	水化学类型	pH值	矿化度/(mg/L)
宝平煤矿	Cl^-·S $O 4 2 -$ —(K⁺+Na⁺)、Ca²⁺	7.5	10 592
文华煤矿	Cl^-·S $O 4 2 -$ —K⁺·Na⁺	7.9	7 532
昌吉监狱煤矿	Cl^-·S $O 4 2 -$ —K⁺·Na⁺	7.9	7 532
益安煤矿	Cl^-· HC $O 3 -$ ·SO₄ ^2-—K⁺·Na⁺	8.0	3 000
寿安煤矿	Cl^-·S $O 4 2 -$ —K⁺·Na⁺	8.0	10 292
红岩煤矿	Cl^-·HC $O 3 -$ ·S $O 4 2 -$ —K⁺·Na⁺	8.0	9 572
阿苏萨依煤矿	HC $O 3 -$ ·S $O 4 2 -$ —Na⁺·Ca²⁺	7.45~8.0	502.4~646.0

Fig.8 Schematic diagram of the syncline-confined coalbed methane enrichment model of Liuhuanggou mining area

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