寿阳地区15号煤层地下水动力场特征及控气作用

doi:10.13809/j.cnki.cn32-1825/te.2022.04.012

摘要/Abstract

摘要：

查明煤层气开发区的水文地质条件及其控气作用能为进一步开发井位部署提供依据。以寿阳地区松塔区块的15号煤层为研究对象,对11口煤层气井的产出水进行常规离子测试,得出了产出水的矿化度、离子分布特征;参考苏林分类法划分了产出水的类型;根据煤层气井排采初期的动液面高度,结合煤层底板标高,计算出各口煤层气井的等折算水位;在此基础上划分出滞流区、弱径流区和径流区。从水化学和水动力角度,分析了水文地质条件对15号煤层含气量的控制作用。结果表明：研究区水质类型主要为NaHCO₃型和CaCl₂型;自北向南可分为径流区、弱径流区和滞流区;当钠氯系数小于1.04,脱硫系数小于0.12,碳酸盐平衡系数小于10.39时,煤层气含气量大于12 m³/t,为煤层气的富集区;水动力封闭型、水动力封堵型的地下水动力条件有利于煤层气的富集;水动力逸散型则导致煤层气含气量降低。该研究结果为研究区煤层气富集区优选及勘探开发提供了参考。

关键词: 水文地质, 离子特征, 水化学参数, 控气作用, 寿阳地区

Abstract:

Finding out the hydrogeological conditions and it’s controlling gas effects of CBM（coalbed methane） development area is important, which can provide a foundation for further development well location deployment. Taking the No.15 coal seam of Songta Block in Shouyang area as a research object, the conventional ion of the produced water in 11 coalbed methane wells has been tested, and the mineralization and ion distribution characteristics of the produced water are obtained. According to the Sulin classification, the types of produced water are divided. And according to the dynamic liquid level height at the initial stage of drainage of coalbed methane wells and combined with the elevation of coalbed floor, the equivalent water level of each coalbed methane well is calculated. On this basis, the hydrodynamic field in studying area are divided into stagnant area, weak runoff area and runoff area. Meanwhile, the controlling gas effects of hydrogeological parameters on gas content of No.15 coal seam are analyzed from the aspects of perspective of hydrochemistry and hydrodynamics. The results show that the main types of water quality in the studying area are NaHCO₃ and CaCl₂. The runoff area, weak runoff area and stagnant area are successively distributed from north to south. For some areas, when the sodium chloride coefficient is less than 1.04, the desulfation coefficient is less than 0.12, and the carbonate balance coefficient is less than 10.39, the gas content is more than 12 m³/t. These areas are beneficiation areas in coalbed methane. The hydrodynamic conditions of hydrodynamic sealing type and hydrodynamic plugging type are conducive to the enrichment of coalbed methane. The hydraulic escape type leads to the decrease of coalbed methane gas content. The research results provide a reference for the optimization, exploration and development of CBM enrichment areas in the study area.

Key words: hydrogeology, ion characteristic, hydrochemical parameter, controlling gas effect, Shouyang area

中图分类号:

TE37

王文升,张亚飞,杜丰丰,韩冬,倪小明. 寿阳地区15号煤层地下水动力场特征及控气作用[J]. 油气藏评价与开发, 2022, 12(4): 643-650.

WANG Wensheng,ZHANG Yafei,DU Fengfeng,HAN Dong,NI Xiaoming. Characteristics of groundwater dynamic field and it’s controlling gas effects in No. 15 coal seam of Shouyang area[J]. Petroleum Reservoir Evaluation and Development, 2022, 12(4): 643-650.

图/表 10

图 1

表1

寿阳地区松塔区块煤层气井排采水常规离子分析结果"

井号	阳离子质量浓度（mg/L）				阴离子质量浓度（mg/L）				矿化度（mg/L）	水质类型
井号	Na⁺	K⁺	Mg²⁺	Ca²⁺	Cl^-	$S O 4 2 -$	$H C O 3 -$	$C O 3 2 -$	矿化度（mg/L）	水质类型
SY03	5 849.65	27.32	62.43	149.10	9 210.37	2.96	696.505	17.172	16 015.51	CaCl₂
SY04	1 649.07	73.99	12.25	45.43	2 331.15	0	614.442	16.506	4 742.84	NaHCO₃
SY06	1 797.60	6.23	8.69	21.85	2 071.05	0	1 332.473	38.196	5 276.09	NaHCO₃
SY09	2 144.59	674.30	64.53	285.01	4 183.60	0	177.042	10.044	7 539.12	CaCl₂
SY10	1 175.34	88.54	7.55	32.08	1 594.04	10.98	668.166	15.918	3 592.61	NaHCO₃
SY18	2 422.89	4 631.46	115.86	454.12	8 358.00	0	100.545	0	16 082.88	CaCl₂
SY11	2 360.11	1 875.15	62.31	190.77	5 585.73	7.95	38.855	3.639	10 124.51	CaCl₂
SY12	2 526.53	1 105.27	52.19	173.31	5 003.32	6.55	343.099	0	9 210.27	CaCl₂
SY13	3 095.24	581.15	53.55	278.79	5 671.55	8.12	342.900	0	10 031.30	CaCl₂
SY14	2 923.51	613.18	29.14	107.25	5 086.91	14.44	82.100	0	8 856.53	CaCl₂
SY15	2 684.09	906.11	24.76	199.20	4 764.09	0	554.711	0	9 132.96	CaCl₂

表1

图2

图3

表2

图4

图5

图6

图7

图8

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水动力分区	等折算水位梯度（m/m）	等折算水位（m）	矿化度 (mg/L)
径流区	>0.02	>700	<4 000
弱径流区	<0.02	600~700	4 000~6 000
滞留区	<0.02	<600	>6 000