鄂尔多斯盆地临兴—神府地区深部煤储层储渗空间发育特征及产水能力评价

王金伟; 许浩; 刘一楠; 张兵; 徐延勇; 刘丁; 宗鹏; 王亚娟; 宋雪静

doi:10.11781/sysydz2025010054

鄂尔多斯盆地临兴—神府地区深部煤储层储渗空间发育特征及产水能力评价

doi: 10.11781/sysydz2025010054

王金伟^{1, 2,},
许浩^{1, 2, 3, ,},
刘一楠⁴,
张兵⁴,
徐延勇⁴,
刘丁^{1, 2},
宗鹏^{1, 2},
王亚娟^{1, 2},
宋雪静^{1, 2}

1.
中国地质大学(北京) 能源学院，北京 100083
2.
国家煤层气工程中心煤储层物性实验室，北京 100083
3.
山西省煤系矿产综合勘查技术创新中心，太原 030006
4.
中联煤层气有限责任公司，北京 100016

基金项目:

国家自然科学基金项目 42172188

详细信息

作者简介:
王金伟(2000—)，男，硕士生，从事深部煤层气地质勘查研究。E-mail: wjw0119@126.com

通讯作者:
许浩(1979—)，男，博士，教授，博士生导师，从事非常规油气地质与开发方面的科研与教学工作。E-mail: xuhao600@163.com

中图分类号: TE122.2
计量
- 文章访问数: 84
- HTML全文浏览量: 35
- PDF下载量: 21
- 被引次数: 0
出版历程
- 收稿日期: 2024-08-28
- 修回日期: 2024-12-03
- 刊出日期: 2025-01-28

Storage and permeation space development characteristics and water production capacity evaluation of deep coal reservoirs in Linxing-Shenfu area of Ordos Basin

WANG Jinwei^{1, 2
,},
XU Hao^{1, 2, 3
, ,},
LIU Yinan⁴,
ZHANG Bing⁴,
XU Yanyong⁴,
LIU Ding^{1, 2},
ZONG Peng^{1, 2},
WANG Yajuan^{1, 2},
SONG Xuejing^{1, 2}

1.
School of Energy Resources, University of Geosciences (Beijing), Beijing 100083, China
2.
Coal Reservoir Laboratory, National Engineering Research Center of Coalbed Methane Development & Utilization, Beijing 100083, China
3.
Center of Technology Innovation for Coal Measure Mineral Resources Comprehensive Exploration of Shanxi Province, Taiyuan, Shanxi 030006, China
4.
China United Coalbed Methane Co., Ltd., Beijing 100016, China

摘要

摘要: 鄂尔多斯盆地临兴—神府地区是我国深部煤层气开发重点区块之一，实际生产中不同区域煤层气井产水量差异显著，影响了深部煤层气的高效开发。通过高压压汞、低温CO₂吸附、低温N₂吸附、CT扫描等实验，对临兴—神府地区8^#+9^#煤层的煤岩样品进行了全尺度的联测表征，查明了研究区储渗空间发育特征。通过赋水模拟实验模拟计算了煤岩储水能力，通过数值模拟预测深部储层产水量，明确了研究区深部煤储层的产水能力，并进一步结合煤层气井产水数据评价了煤层水的来源。研究表明，临兴—神府地区深部煤储层整体上微孔和宏孔及裂隙比较发育，介孔发育相对较差。随变质程度升高，总孔体积先减后增，深部煤岩原始含水性急剧下降，储水能力先减后增，光亮煤在储水能力上有较大优势。研究区低镜质体反射率(R_o)煤岩日均产水量预测为12.81~26.01 m³，中R_o煤岩为1.82~7.22 m³，高R_o煤岩为1.90~8.22 m³。煤层气井实际日产水量超出该范围即为受外源水补给影响，低于该范围即为煤层自产。深部煤储层原始含水性较差，且储水能力有限，尤其在高R_o段，即使储层在完全饱和水的条件下，其产水量也应保持较低水平，持续高产水必定伴随大量的外源输入。
- 深部煤层气 /
- 储渗空间 /
- 产水量预测 /
- 产水特征 /
- 临兴—神府地区 /
- 鄂尔多斯盆地
Abstract: The Linxing-Shenfu area in the Ordos Basin is one of the key areas for deep coalbed methane (CBM) development in China. However, significant variations in water production among CBM wells in different regions have hindered the efficient development of deep CBM. This study conducted multi-scale characterizations of coal samples from the 8^#+9^# coal seams in the Linxing-Shenfu area using high-pressure mercury intrusion porosimetry, low-temperature CO₂ adsorption, low-temperature N₂ adsorption, and CT scanning experiments. These methods revealed the development characteristics of the storage and permeability space in the study area. Water saturation simulation experiments were conducted to estimate the water storage capacity of coal samples, and numerical simulations were used to predict the water production capacity of deep reservoirs, providing a clear understanding of the water production capacity of deep coal reservoirs in the study area. Combined with actual water production data from CBM wells, the sources of coal seam water were further evaluated. The results show that deep coal reservoirs in the Linxing-Shenfu area exhibit well-developed micropores, macropores, and fractures, with relatively underdeveloped mesopores. As coal rank increases, the total pore volume first decreases and then increases. The original water content of deep coal samples declines sharply, while the water storage capacity first decreases and then increases, with bright coal showing a greater advantage in water storage capacity. The predicted daily water production ranges for low-vitrinite-reflectance (R_o) coal reservoirs in the study area are 12.81 to 26.01 m³, for medium-R_o coal reservoirs 1.82 to 7.22 m³, and for high-R_o coal reservoirs 1.90 to 8.22 m³. Actual water production exceeding these ranges indicates the influence from external water input, while production below these ranges indicates self-sourced water from the coal seams. Deep coal reservoirs have poor original water content and limited water storage capacity, especially in high-R_o coal reservoirs. Even when these reservoirs are fully saturated, water production remains low. Sustained high water output must involve substantial external water input.
- deep coalbed methane /
- storage and permeation space /
- water production prediction /
- water production characteristics /
- Linxing-Shenfu area /
- Ordos Basin
注释:

利益冲突声明/Conflict of Interests

所有作者声明不存在利益冲突。

All authors declare no relevant conflict of interests.

作者贡献/Authors’Contributions

王金伟、许浩参与论文写作和修改；刘一楠、张兵、徐延勇提供样品和资料支持；刘丁参与文章设计及讨论；宗鹏、王亚娟、宋雪静提供修改意见。所有作者均阅读并同意最终稿件的提交。

WANG Jinwei and XU Hao participated in the writing and revision of the manuscript. LIU Yinan, ZHANG Bing, and XU Yanyong provided samples and data support. LIU Ding contributed to the design and discussion of the article. ZONG Peng, WANG Yajuan, and SONG Xuejing provided feedback on the revisions. All authors have read the final version of the paper and consented to its submission.

HTML全文

图 1 鄂尔多斯盆地临兴—神府地区构造位置(a)及8^#+9^#煤层顶板埋深(b)

Figure 1. Structural location(a) and buried depth of 8^#+9^# coal seam roof(b) in Linxing-Shenfu area, Ordos Basin

下载: 全尺寸图片幻灯片

图 2 鄂尔多斯盆地临兴—神府地区8^#+9^#煤层煤岩样品基于CT提取的孔裂隙三维结构及孔隙度

Figure 2. CT extraction-based 3D pore-fracture structure and porosity of coal rock samples from 8^#+9^# coal seams in Linxing-Shenfu area, Ordos Basin

下载: 全尺寸图片幻灯片

图 3 鄂尔多斯盆地临兴—神府地区8^#+9^#煤层煤岩样品CO₂吸附、N₂吸附、高压压汞联测的全孔孔径分布

Figure 3. Full pore size distribution of coal rock samples from 8^#+9^# coal seams in Linxing-Shenfu area, Ordos Basin, jointly measured using CO₂ adsorption, N₂ adsorption, and high-pressure mercury intrusion porosimetry

下载: 全尺寸图片幻灯片

图 4 鄂尔多斯盆地临兴—神府地区8^#+9^#煤层煤岩样品CO₂吸附、N₂吸附、高压压汞、CT扫描联测的全孔孔径分布

Figure 4. Full pore size distribution of coal rock samples from 8^#+9^# coal seams in Linxing-Shenfu area, Ordos Basin, jointly measured using CO₂ adsorption, N₂ adsorption, high-pressure mercury intrusion porosimetry, and CT scanning

下载: 全尺寸图片幻灯片

图 5 鄂尔多斯盆地临兴—神府地区8^#+9^#煤层岩心工业分析含水量及测得的最大饱和水量

Figure 5. Water content by industrial analysis and measured maximum saturation water content of 8^#+9^# coal seam cores in Linxing-Shenfu area, Ordos Basin

下载: 全尺寸图片幻灯片

图 6 鄂尔多斯盆地临兴—神府地区8^#+9^#煤层产水量动态预测

生产压差为11 MPa。

Figure 6. Dynamic prediction of water production in 8^#+9^# coal seams in Linxing-Shenfu area, Ordos Basin

下载: 全尺寸图片幻灯片

图 7 鄂尔多斯盆地临兴—神府地区煤层气井产水来源

Figure 7. Water production sources for coalbed methane wells in Linxing-Shenfu area, Ordos Basin

下载: 全尺寸图片幻灯片

表 1 鄂尔多斯盆地临兴—神府地区8^#+9^#煤层煤岩样品基本信息

Table 1. Basic information of coal rock samples from 8^#+9^# coal seams in Linxing-Shenfu area, Ordos Basin

样品编号	岩性	平均镜质体反射率/%	工业组分/%				显微组分/%
样品编号	岩性	平均镜质体反射率/%	水分	灰分	挥发分	固定碳	壳质组	镜质组	惰质组
L-GL	光亮煤	0.77	1.32	8.48	23.13	67.07	3.1	95.4	1.5
L-AD	暗淡煤	0.77	1.28	31.89	28.59	38.24	5.3	38.0	56.7
M-GL	光亮煤	1.26	0.39	2.59	22.20	74.82		98.6	1.4
M-AD	暗淡煤	1.26	0.37	37.68	14.67	47.28		30.8	69.2
H-GL	光亮煤	2.10	0.37	4.16	9.63	85.84		93.7	6.3
H-AD	暗淡煤	2.10	0.34	38.19	10.57	50.90		46.4	53.6

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表 2 鄂尔多斯盆地临兴—神府地区8^#+9^#煤层煤岩样品压汞法和气体吸附法联测孔隙结构信息

Table 2. Pore structure information of coal rock samples from 8^#+9^# coal seams in Linxing-Shenfu area, Ordos Basin, jointly measured using mercury intrusion porosimetry and gas adsorption analysis

样品编号	CO₂吸附法			N₂吸附法			压汞
样品编号	DR比表面积/ (m²/g)	DA总孔容/ (cm³/g)	平均孔径/ nm	BET比表面积/ (m²/g)	BJH总孔容/ (cm³/g)	平均孔径/ nm	注汞体积/ (mL/g)	平均孔径/ nm
L-GL	67.095	0.020 72	1.262 50	1.334 9	0.005 45	14.350	0.43	264.69
L-AD	56.087	0.017 35	1.172 50	2.802 0	0.010 56	13.870	0.22	113.78
M-GL	64.449	0.009 88	1.044 40	0.915 4	0.005 68	23.570	0.08	57.62
M-AD	16.608	0.002 02	0.992 30	2.429 0	0.011 20	19.160	0.05	97.32
H-GL	113.941	0.027 57	1.117 70	0.490 0	0.002 00	3.981	0.11	71.39
H-AD	55.690	0.014 54	1.154 10	1.437 0	0.003 00	3.902	0.08	125.39

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表 3 鄂尔多斯盆地临兴—神府地区8^#+9^#煤层产水量计算参数

Table 3. Parameters for water production calculation of 8^#+9^# coal seams in Linxing-Shenfu area, Ordos Basin

R_o/%	煤岩类型	孔隙度/%	总压缩系数/MPa^-1	地层原始渗透率/10^-3 μm²
0.60	光亮煤	28.8	2.282 06	0.96
0.60	暗淡煤	12.0	3.249 75	0.19
1.00	光亮煤	15.6	2.003 54	0.82
1.00	暗淡煤	9.5	2.865 94	0.17
1.35	光亮煤	2.1	1.141 03	0.56
1.35	暗淡煤	0.8	1.522 97	0.13
1.80	光亮煤	2.5	0.283 54	0.68
1.80	暗淡煤	0.9	0.564 27	0.15
2.10	光亮煤	3.5	0.228 21	0.72
2.10	暗淡煤	0.9	0.315 18	0.16

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表 4 鄂尔多斯盆地临兴—神府地区8^#+9^#煤层理论日均产水量预测结果

Table 4. Predicted theoretical daily average water production of 8^#+9^# coal seams in Linxing-Shenfu area, Ordos Basin

R_o/%	煤岩类型	理论平均日产水量(生产压差为11 MPa)/m³
0.60	光亮煤	26.007 3
0.60	暗淡煤	12.809 8
1.00	光亮煤	13.439 2
1.00	暗淡煤	5.337 4
1.35	光亮煤	7.224 4
1.35	暗淡煤	1.815 2
1.80	光亮煤	8.172 3
1.80	暗淡煤	1.892 9
2.10	光亮煤	8.215 7
2.10	暗淡煤	1.901 9

下载: 导出CSV

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