低阶煤储层微观孔隙结构多尺度联合表征

doi:10.12108/yxyqc.20200302

岩性油气藏 ›› 2020, Vol. 32 ›› Issue (3): 14–23.doi: 10.12108/yxyqc.20200302

低阶煤储层微观孔隙结构多尺度联合表征

杨甫^1,2,3, 贺丹^2,3, 马东民^1,2, 段中会^2,3, 田涛^2,3, 付德亮^2,3

1. 西安科技大学地质与环境学院, 西安 710054;
2. 自然资源部煤炭资源勘查与综合利用重点实验室, 西安 710021;
3. 陕西省煤田地质集团有限公司, 西安 710021

收稿日期:2019-05-20 修回日期:2019-09-04 出版日期:2020-05-21 发布日期:2020-04-30
第一作者:杨甫(1986-),男,博士,高级工程师,主要从事盆地构造与非常规天然气地质方面的研究。地址:(710021)陕西省西安市经济开发区文景路26号。Email:yangpu666@163.com。
基金资助:
中国博士后基金面上项目“不同煤阶煤岩组分对煤层气解吸过程的吸附热差异”（编号：2018M633642XB）、自然资源部重点实验室项目和陕西省博士后基金“鄂尔多斯盆地南缘三叠系页岩储层孔隙特征及页岩气富集规律”（编号：ZP2018-2，2018BSHQYXMZZ08）和陕西省煤田地质集团有限公司重大科研课题“陕西省富油煤生油潜力评价及高效开发利用技术”（编号：SMDZ-2019ZD-1）联合资助

Multi-scale joint characterization of micro-pore structure of low-rank coal reservoir

YANG Fu^1,2,3, HE Dan^2,3, MA Dongmin^1,2, DUAN Zhonghui^2,3, TIAN Tao^2,3, FU Deliang^2,3

1. College of Geology and Environment, Xi'an University of Science and Technology, Xi'an 710054, China;
2. Key Laboratory of Coal Resources Exploration and Comprehensive Utilization, Ministry of Natural Resources, Xi'an 710021, China;
3. Shaanxi Coal Geology Group Co., Ltd., Xi'an 710021, China

Received:2019-05-20 Revised:2019-09-04 Online:2020-05-21 Published:2020-04-30

摘要/Abstract

摘要： 多尺度微观孔隙结构对低阶煤储层煤层气吸附/解吸过程的研究具有重要意义。以黄陇侏罗系煤田和陕北侏罗系煤田低阶煤为研究对象，采用压汞、液氮吸附和CO₂吸附等测试手段表征低阶煤储层的孔径分布、孔隙类型等参数，联合核磁共振测试定量分析低阶煤阶段孔径和多尺度孔径分布特征。结果表明，低阶煤孔隙以微孔为主，大孔次之。微孔、大孔、介孔对比表面积的贡献率依次减小。低阶煤储层孔隙类型以两端开口的“柱状孔”和“墨水瓶孔”为主，孔隙连通性较好。核磁共振法获取样品的T₂c截止值为1.4～155.2 ms，变化较大，束缚流体饱和度（BVI）为79.21%～96.96%，可动流体饱和度低。低阶煤储层的孔隙结构复杂多样，单一测试技术与联合计算表征方法在表征低阶煤储层的孔隙结构时差异较大。

关键词: 孔隙类型, 孔径分布, 核磁共振, 低阶煤储层, 侏罗系, 黄陇煤田, 陕北煤田

Abstract: The multi-scale micro-pore structure is of great significance to the study of the adsorption/desorption process of coalbed methane in low rank coal reservoirs. Taking Jurassic Huanglong coalfield and Shaanbei coalfield as examples,the pore size distribution andpore types of low-rank coal reservoirs were measured by mercury injection, liquid nitrogen adsorption and CO₂ adsorption. Combined with nuclear magnetic resonance,the pore size and multi-scale pore size distribution characteristics of low-rank coal were quantitatively analyzed. The results show that the pores of low-rank coal are mainly micropores,followed by macropores. The contribution rate of micropores,macropores and mesoporous pores to specific surface area decreased in turn.The pore types of low-rank coal reservoirs are mainly "columnar pore" and "ink bottle hole",which have good pore connectivity. The T₂c cut-off value of the samples obtained by NMR method is 1.4-155.2 ms,which varies greatly. The bound fluid saturation(BVI) is 79.21%-96.96%,and the movable fluid saturation is low. The pore structure of low-rank coal reservoirs is complex and diverse,and there are great differences between single test technique and combined computing characterization method in the characterization of pore structures of low-rank coal reservoirs.

Key words: pore type, pore size distribution, nuclear magnetic resonance, low rank coal reservoir, Jurassic, Huanglong coalfield, Shaanbei coalfield

中图分类号:

TE122.2

杨甫, 贺丹, 马东民, 段中会, 田涛, 付德亮. 低阶煤储层微观孔隙结构多尺度联合表征[J]. 岩性油气藏, 2020, 32(3): 14–23.

YANG Fu, HE Dan, MA Dongmin, DUAN Zhonghui, TIAN Tao, FU Deliang. Multi-scale joint characterization of micro-pore structure of low-rank coal reservoir[J]. Lithologic Reservoirs, 2020, 32(3): 14–23.

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低阶煤储层微观孔隙结构多尺度联合表征

Multi-scale joint characterization of micro-pore structure of low-rank coal reservoir

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