三塘湖盆地侏罗系西山窑组褐煤储层孔隙结构特征及脱水演化规律

doi:10.12108/yxyqc.20240502

岩性油气藏 ›› 2024, Vol. 36 ›› Issue (5): 15–24.doi: 10.12108/yxyqc.20240502

三塘湖盆地侏罗系西山窑组褐煤储层孔隙结构特征及脱水演化规律

孔令峰^1,2, 徐加放¹, 刘丁³

1. 中国石油大学(华东)石油工程学院, 山东青岛 266580;
2. 中国石油天然气集团有限公司发展计划部, 北京 100007;
3. 中国地质大学(北京)能源学院, 北京 100083

收稿日期:2024-01-23 修回日期:2024-03-13 出版日期:2024-09-01 发布日期:2024-09-04
第一作者:孔令峰（1977—），男，中国石油大学（华东）在读博士研究生，高级工程师，主要从事油气勘探开发、新能源发展战略与规划、投资项目经济评价等方面的研究工作。地址：（100007）北京市东城区东直门北大街9号。Email：lfkong@petrochina.com.cn。
通信作者: 刘丁（1998—），男，中国地质大学（北京）在读博士研究生，研究方向为非常规能源勘探开发。Email：ld19981222@163.com。
基金资助:
中石油股份公司科技重大专项“煤炭地下气化地质评价与选址研究”（编号：2019E-25）资助。

Pore structure characteristics and dehydration evolution of lignite reservoirs of Jurassic Xishanyao Formation in Santanghu Basin

KONG Lingfeng^1,2, XU Jiafang¹, LIU Ding³

1. School of Petroleum Engineering, China University of Petroleum(East China), Qingdao 266580, Shandong, China;
2. Development Planning Department, China National Petroleum Corporation, Beijing 100007, China;
3. School of Energy Resources, China University of Geosciences(Beijing), Beijing 100083, China

Received:2024-01-23 Revised:2024-03-13 Online:2024-09-01 Published:2024-09-04

摘要/Abstract

摘要： 查明干燥前后煤孔隙结构差异及演化规律有助于准确预测煤炭地下气化炉运行效果。通过选择水、煤油作为饱和流体进行低场核磁共振实验，测试并对比同一样品分别在饱水和干燥状态下的孔隙结构差异；通过X-CT技术观察了煤样孔隙结构的脱水演化过程并建立了演化模式；通过脉冲衰减渗透率测试与低温液氮吸附实验评估了煤样的传质能力变化。研究结果表明：①褐煤干燥发生孔隙收缩的同时会产生裂缝，总孔容由0.630 cm³/g降至0.481 cm³/g，而大孔体积显著增加，由0.070 cm³/g增加至0.420 cm³/g，脱水导致孔隙集中，大孔体积占比达88%。②褐煤干燥时的孔隙收缩受基质收缩程度控制，不同煤岩组分脱水的孔隙结构演化模式不同，易收缩的基质煤脱水时，其组分边缘或内部产生大量裂隙，而木质煤或丝质煤脱水收缩较弱，保留大量原生孔隙，裂隙发育较少。③褐煤干燥后，水分脱除、空孔体积增加，渗流状态由单相水向气水两相、单相气流转变的同时形成了良好的连通孔隙网络，煤层渗流能力显著改善，渗透率由0.248 mD增加至48.080 mD，扩散传质贡献增大，干燥褐煤在温度为200℃、压力为0.5 MPa时中孔及大孔的扩散系数约为0.09 cm²/s。

关键词: 褐煤储层, 孔隙结构, 脱水演化规律, 弛豫谱, X射线断层扫描, 渗流能力, 煤炭地下气化, 西山窑组, 侏罗系, 三塘湖盆地

Abstract: It is helpful to accurately predict the operation effect of underground coal gasifier to find out the difference and evolution law of pore structure of coal before and after drying. By selecting water and kerosene as saturated fluids to carry out low-field NMR experiment，the pore structure of the same sample under saturated and dry conditions was tested and compared. The dehydration evolution process of pore structure of coal samples was observed through X-CT technology and an evolution model was established，and pulse attenuation permeability test and low-temperature liquid nitrogen adsorption experiments were conducted to evaluate the mass transfer ability of coal samples. The results show that：（1）During the drying of lignite，pore shrinkage occurs while cracks are produced，and the total pore volume decreases from 0.630 cm³/g to 0.481 cm³/g，while the large pore volume significantly increases from 0.070 cm³/g to 0.420 cm³/g. Dehydration leads to pore concentration，with the large pore volume accounting for 88%.（2）The pore shrinkage during the drying of lignite is controlled by the degree of matrix shrinkage. The dehydration of different coal rock components can be summarized into two types of pore structure evolution models：the dehydration of matrix coal that is prone to shrink develops a large number of cracks at the edges or inside of the components，while the dehydration shrinkage of xylite-rich and charcoal-rich coal is weak，retaining a large number of primary pores and developing fewer cracks.（3）After the drying of the lignite，water is removed and the number of empty pores increases. The seepage state changes from single-phase water to gas-water two-phase and single-phase airflow，forming a good interconnected pore network. The seepage ability of the coal is significantly improved，and the permeability increases from 0.248 to 48.080 mD. The contribution of diffusive mass transfer is increased，with diffusion coefficient of medium and large pores in dry lignite being about 0.09 cm²/s at a temperature of 200 ℃ and a pressure of 0.5 MPa.

Key words: lignite reservoir, pore structure, dehydration evolution law, relaxation spectrum, X-ray CT, seepage ability, underground coal gasification, Xishanyao Formation, Jurassic, Santanghu Basin

中图分类号:

TE122

孔令峰, 徐加放, 刘丁. 三塘湖盆地侏罗系西山窑组褐煤储层孔隙结构特征及脱水演化规律[J]. 岩性油气藏, 2024, 36(5): 15–24.

KONG Lingfeng, XU Jiafang, LIU Ding. Pore structure characteristics and dehydration evolution of lignite reservoirs of Jurassic Xishanyao Formation in Santanghu Basin[J]. Lithologic Reservoirs, 2024, 36(5): 15–24.

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三塘湖盆地侏罗系西山窑组褐煤储层孔隙结构特征及脱水演化规律

Pore structure characteristics and dehydration evolution of lignite reservoirs of Jurassic Xishanyao Formation in Santanghu Basin

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