镜煤和暗煤与甲烷界面作用实验研究——以民和盆地低阶煤为例

doi:10.13809/j.cnki.cn32-1825/te.2022.04.002

油气藏评价与开发 ›› 2022, Vol. 12 ›› Issue (4): 556-563.doi: 10.13809/j.cnki.cn32-1825/te.2022.04.002

镜煤和暗煤与甲烷界面作用实验研究——以民和盆地低阶煤为例

马东民^1,²(),王馨¹(),滕金祥¹,季长江²,邵凯³,郑超¹,伋雨松¹,惠鹏¹

1.西安科技大学地质与环境学院,陕西西安 710054
2.国家能源煤与煤层气共采技术国家重点实验室,山西晋城 048000
3.陕西省煤层气开发利用有限公司,陕西西安 710065

收稿日期:2022-04-12 出版日期:2022-08-26 发布日期:2022-09-02
通讯作者: 王馨 E-mail:mdm6757@126.com;2289475221@qq.com
作者简介:马东民（1967—）,男,博士,教授,主要从事煤与煤层气地质教学研究。地址：陕西省西安市碑林区文艺路街道雁塔中路58号西安科技大学,邮政编码：710054。E-mail： mdm6757@126.com
基金资助:
国家自然科学基金项目“润湿性制约下低阶煤不同煤岩组分甲烷解吸机制”(41902175);陕西省自然科学基础研究计划“彬长地区煤层气解吸产出过程的润湿性作用机制”(2019JQ-245);中国博士后科学基金项目“低煤阶镜煤与暗煤润湿性差异及对甲烷解吸的影响”(2019M653873XB)

Experimental study on interfacial interaction between methane and vitrinite and durain: A case study of bituminous coal in Minhe Basin

MA Dongmin^1,²(),WANG Xin¹(),TENG Jinxiang¹,JI Changjiang²,SHAO Kai³,ZHENG Chao¹,JI Yusong¹,HUI Peng¹

1. College of Geology and Environment, Xi’an University of Science and Technology, Xi’an, Shaanxi 710054, China
2. Key Laboratory of Coal and Coalbed Methane Co-mining Technology, Jin cheng, Shanxi 048000, China
3. Shaanxi Coalbed Methane Development Corp., Ltd., Xi’an, Shaanxi 710065, China

Received:2022-04-12 Online:2022-08-26 Published:2022-09-02
Contact: WANG Xin E-mail:mdm6757@126.com;2289475221@qq.com

摘要/Abstract

摘要：

为研究低阶煤中凝胶化组分（镜煤）与丝炭化组分（暗煤）对甲烷的吸附/解吸差异,采集民和盆地海石湾煤矿2号煤作为研究对象,分别对等温吸附/解吸实验数据进行Langmuir拟合与双位Langmuir拟合,计算等量吸附热,分析不同逸度环境的吸附热力学特征,探讨煤岩组分差异对煤层气产出的影响。结果表明：①煤中凝胶化组分与丝炭化组分对甲烷的吸附均符合Langmuir方程,凝胶化组分的吸附量远高于丝炭化组分;②同一温度点下,无论是粒煤还是柱煤,均存在解吸滞后现象,这是由于吸附热差异导致,而粒煤实验拟合结果的a、b值均大于块煤实验结果的a、b值;③等量吸附热随逸度的增大而变大,随温度的升高而降低,吸附相密度对等量吸附热的影响大于温度,导致在煤表面吸附动能更大的甲烷分子,其等量吸附热整体随温度升高呈下降趋势;④煤的不同宏观组分吸附能力差异较大,镜煤含量较大区应为煤层气井井位部署的首选。

关键词: 凝胶化组分, 丝炭化组分, 吸附/解吸, 等量吸附热, 海石湾煤矿

Abstract:

In order to study the differences in the adsorption/desorption characteristics of methane between the gelification and fusinization in the bituminous coal, the 2# coal seam of the Haishiwan Coal Mine in Minhe Basin is collected as the research object. By using the Langmuir fitting and dual-site Langmuir fitting on the experimental data of isothermal adsorption/desorption respectively, the adsorption thermodynamic characteristics of different fugacity environments are analyzed by calculating the isosteric adsorption heat, and the influence of maceral difference on coalbed methane production is discussed. The results show that: ①The adsorption of methane on the gelification and fusinization in coal accords with the Langmuir function, and the fitting degree is higher than 0.99. The adsorption capacity of the gelification is much higher than that of the fusinization. ②At the same temperature point, there is desorption lag phenomenon in both granular coal and pillar coal, which is due to the difference of adsorption heat. The fitting results of granular coal experiment are larger than those of lump coal experiment. ③The equivalent adsorption heat increases with the increase of fugacity and decreases with the increase of temperature. The influence of adsorption phase density on the equivalent adsorption heat is greater than that of temperature, leading to the adsorption of methane molecules with greater kinetic energy on the coal surface. The equivalent adsorption heat decreases with the increase of temperature as a whole. ④The adsorption capacity of different components of coal is quite different, and areas with high vitrain content should be the first choice for CBM well location deployment.

Key words: gelification, fusinization, adsorption/desorption, isosteric adsorption heat, Haishiwan Coal Mine

中图分类号:

TE135

马东民,王馨,滕金祥,季长江,邵凯,郑超,伋雨松,惠鹏. 镜煤和暗煤与甲烷界面作用实验研究——以民和盆地低阶煤为例[J]. 油气藏评价与开发, 2022, 12(4): 556-563.

MA Dongmin,WANG Xin,TENG Jinxiang,JI Changjiang,SHAO Kai,ZHENG Chao,JI Yusong,HUI Peng. Experimental study on interfacial interaction between methane and vitrinite and durain: A case study of bituminous coal in Minhe Basin[J]. Petroleum Reservoir Evaluation and Development, 2022, 12(4): 556-563.

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样品来源	水分M_ad	灰分A_ad	挥发分V_ad	固定碳FC_ad
海石湾2号煤层原煤	4.25	7.25	24.93	63.57
海石湾2号煤层镜煤	1.38	3.28	26.92	68.42
海石湾2号煤层暗煤	1.63	3.99	23.28	71.10

样品来源	镜质组	惰质组	壳质组	矿物质
海石湾2号煤层镜煤	78.3	18.0	1.9	1.8
海石湾2号煤层暗煤	13.3	74.6	7.3	4.8

温度（℃）	升压过程Langmuir拟合			降压过程解吸式拟合
温度（℃）	a	b	R²	a	b	c	R²
20	7.276	0.145	0.999	6.109	0.188	0.195	0.999
25	6.751	0.144	0.999	5.593	0.176	0.288	0.999
30	6.157	0.144	0.999	5.540	0.159	0.129	0.999
35	5.611	0.142	0.999	4.490	0.179	0.283	0.999
40	5.357	0.144	0.999	4.964	0.140	0.166	0.999
45	5.106	0.143	0.999	4.235	0.152	0.316	0.999

温度（℃）	升压过程双位Langmuir拟合					降压过程双位解吸式拟合
温度（℃）	a₁	b₁	a₂	b₂	R²	a₁	b₁	a₂	b₂	R²
20	7.284	0.143	0.015	0.735	0.999	6.076	0.203	0.092	-3.285	0.999
25	6.703	0.145	0.009	-0.082	0.999	5.588	0.178	0.267	-27.088	0.999
30	6.132	0.142	0.057	0.396	0.999	6.069	0.057	1.732	0.486	0.999
35	5.624	0.140	0.012	1.017	0.999	4.475	0.188	0.227	-10.099	0.999
40	5.198	0.147	0.578	-0.011	0.999	3.475	0.280	0.091	-0.127	0.999
45	4.993	0.138	0.152	0.284	0.999	4.601	0.102	0.632	2.535	0.999

温度（℃）	升压过程Langmuir拟合			降压过程解吸式拟合
温度（℃）	a	b	R²	a	b	c	R²
20	7.399	0.151	0.999	6.388	0.175	0.252	0.999
30	6.162	0.150	0.999	5.214	0.201	0.145	0.999
40	5.600	0.150	0.999	4.860	0.185	0.107	0.999

镜煤和暗煤与甲烷界面作用实验研究——以民和盆地低阶煤为例

Experimental study on interfacial interaction between methane and vitrinite and durain: A case study of bituminous coal in Minhe Basin

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