Division of Methane Weathering Zones in the Middle and Lower Jurassic Coal Seams of Santanghu Basin

doi:10.7657/XJPG20200302

Abstract

Abstract:

Based on the gas contents and main gas components of the middle and low rank coal seams in the Santanghu basin, and combined with the structure, sedimentation and hydrogeological characteristics of the basin, the methane weathering zones in the coal seams in Hanshuiquan sag and Tiaohu sag are divided, and the methane weathering zones in the coal seams of the Kumusu sag, Malang sag, Naomaohu sag and Suluke sag are predicted. The results show that the methane weathering zones in Santanghu basin are 400-1 000 m deep. The methane weathering zone in the northern part of the basin is shallower than that in the southern part due to the influence of the thrust uplift zone in the northeastern in Santanghu basin. The sedimentary environments of the coal seams of the deep-lake-semi-deep lake facies and the braided river delta facies in Naomaohu sag, Malang sag and Tiaohu sag in the eastern Santanghu basin are better than those of the fan delta facies in Hanshuiquan sag and Kumusu sag in the western Santanghu basin, causing the methane weathering zone in the eastern basin generally shallower than that in the western basin. The methane weathering zones representing open, locally retained hydrogeological units in Tiaohu sag and Malang sag are shallower than those representing close, weak runoff hydrogeological units in other sags. It is preliminarily predicted that the northern Malang sag is the target area for further coalbed methane exploration and development, and the northern Tiaohu sag is the target area for exploration and development of the coal measure gas.

Key words: Santanghu basin, Hanshuiquan sag, Tiaohu sag, Middle-Lower Jurassic, methane weathering zone, coalbed methane, low rank coal

CLC Number:

TE122.2

WANG Qiong, YANG Shuguang, WANG Gang, XU Hao, REN Pengfei, DONG Wenyang. Division of Methane Weathering Zones in the Middle and Lower Jurassic Coal Seams of Santanghu Basin[J]. Xinjiang Petroleum Geology, 2020, 41(3): 261-268.

Figures/Tables 8

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Table 1

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Table 2

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凹陷名称	井名	层位	埋深/m	煤层编号	含气量/ （m³·t^-1）	CH₄体积分数/ %	CO₂体积分数/ %	N₂体积分数/ %
库木苏凹陷	K1井	西山窑组	506.2~506.7	2#	0.10
			705.5~707.0	6#	0.07
			741.3~750.0	9#	1.38
			161.2~164.0	2#	0.09
	K2井	西山窑组	509.1~521.9	9#	0.12
			692.8~693.5	17#	1.24
			697.8~698.4	18#	1.48
汉水泉凹陷	H1井	八道湾组	779.3~798.2	27#	1.86	84.7	4.4	10.8
			808.4~810.5	28#	3.87	85.1	6.8	8.0
			812.9~825.6	29#	4.12	87.0	6.8	6.2
			829.2~837.4	30#	4.27	87.1	9.4	3.3
			841.6~844.4	31#	4.86	86.6	9.5	3.5
			855.2~858.4	32#	3.76	85.7	9.5	4.5
	H2井	八道湾组	883.2~886.6	26#	0.88	77.8	3.2	19.0
			887.5~902.5	27#	1.63	82.1	5.0	12.9
			908.7~914.6	28#	1.83	84.9	5.5	9.6
			916.8~929.1	29#	1.82	83.2	4.4	12.4
			930.5~938.9	30#	1.43	83.3	4.4	12.3
			939.2~943.1	31#	1.01	84.2	4.5	11.2
	H3井	八道湾组	972.4~974.4	27#	0.30
	H3井	八道湾组	1 065.3~1 069.4	33#	0.29
条湖凹陷	T1井	西山窑组	833.2~847.6	9#	1.82	85.2	1.6	13.2
			934.0~936.2	17#	1.70	81.7	2.5	24.6
			947.3~948.7	18#	1.59	81.2	1.5	17.3
			964.7~967.4	19#	1.36