页岩和煤岩的孔隙结构差异及其天然气运移机理
文献类型：期刊论文
| 作者 | Deng, Ze,,; Wang, Hongyan,,; Jiang, Zhenxue; Sun, Mengdi; Wu, Zeyu; Xu, Yanran; Ke, Yubin
|
| 刊名 | 天然气工业；Natural Gas Industry
 |
| 出版日期 | 2022 |
| 卷号 | 42期号:11页码:37-49 |
| ISSN号 | 10000976 |
| DOI | 10.3787/j.issn.1000-0976.2022.11.004 |
| 文献子类 | Article |
| 英文摘要 | Shale and coal are unconventional natural gas reservoirs, and their pore structures control the occurrence state and migration mechanism of natural gas. To quantitatively characterize their pore structure characteristics and differences, this paper comparatively analyzes the reservoir capacities and pore structures of the over-mature shale in Lower Silurian Longmaxi Formation and Upper Permian Longtan Formation and the coal in Upper Carboniferous Benxi Formation using small-angle neutron scattering technology (SANS), mercury intrusion capillary pressure method (MICP), gas adsorption method and field emission-scanning electron microscopy, so as to clarify the pore structure differences between shale and coal and their causes. In addition, the occurrence and migration mechanisms of methane in the reservoirs are studied. And the following research results are obtained. First, the main reservoir space in coal is less than 5 nm in pore size, in which methane is mainly in the form of adsorbed gas, while the pores with size larger than 5 nm in shale are the main reservoir space of free gas. Second, the differential characteristics of pore structures based on the experimental results of SANS and MICP can be used to evaluate pore connectivity. In this study, the pore connectivity of coal is better than that of shale. Third, the repeated MICP results indicate that high pressure cannot induce new fractures in the samples of over-mature shale and coal. In conclusion, the desorption of adsorbed gas in micropores of coal reservoirs into free gas is the key to coalbed methane exploitation, and the migration of shale gas from matrix reservoir space to natural or artificial fractures in shale reservoirs is controlled by pore connectivity. What’s more, the key to improving the recovery factor of shale gas is to increase induced fractures in shale, effectively connect induced fractures with natural fractures and improve the connectivity between organic pore networks and the external parts. The research results provide an important theoretical support for subsequent scientific evaluation on these two kinds of unconventional oil and gas reservoirs. © 2022 Natural Gas Industry Journal Agency. All rights reserved. |
| 语种 | 英语 |
| 源URL | [http://ir.ihep.ac.cn/handle/311005/300520]  |
| 专题 | 高能物理研究所_东莞分部 |
| 作者单位 | 中国科学院高能物理研究所 |
| 推荐引用方式 GB/T 7714 | Deng, Ze,,,Wang, Hongyan,,,Jiang, Zhenxue,等. 页岩和煤岩的孔隙结构差异及其天然气运移机理[J]. 天然气工业；Natural Gas Industry,2022,42(11):37-49. |
| APA | Deng, Ze,,.,Wang, Hongyan,,.,Jiang, Zhenxue.,Sun, Mengdi.,Wu, Zeyu.,...&Ke, Yubin.(2022).页岩和煤岩的孔隙结构差异及其天然气运移机理.天然气工业；Natural Gas Industry,42(11),37-49. |
| MLA | Deng, Ze,,,et al."页岩和煤岩的孔隙结构差异及其天然气运移机理".天然气工业；Natural Gas Industry 42.11(2022):37-49. |
入库方式： OAI收割
来源：高能物理研究所
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