| 沁水盆地阳泉区块上古生界煤系页岩气储层特征 |
| |
| 引用本文： | 李阳阳,李贤庆,张学庆,肖贤明,于振锋,王保玉.沁水盆地阳泉区块上古生界煤系页岩气储层特征[J].煤田地质与勘探,2021,49(2):142-151. |
| |
| 作者姓名： | 李阳阳 李贤庆 张学庆 肖贤明 于振锋 王保玉 |
| |
| 基金项目： | 国家自然科学基金项目(U1810201)；国家科技重大专项课题(2016ZX05007-003)；中央高校基本科研业务费专项资金项目(2020YJSMT02) |
| |
| 摘 要： | 页岩储层特征是进行页岩气储集能力评价的基础内容。为探究高演化阶段煤系页岩气储层性质和优选有利储层，运用岩石热解、X射线衍射、扫描电子显微镜、高压压汞、低温N2和CO2气体吸附多种实验方法，对沁水盆地阳泉区块上古生界煤系页岩岩心样品进行储层特征研究。结果表明:沁水盆地阳泉区块上古生界煤系页岩，有机碳含量较高(TOC平均为4.9%)，处于过成熟阶段(Rran平均为2.32%)，黏土矿物质量分数较高(平均为50.0%)，具有低孔低渗的特征(孔隙率平均为6.61%，渗透率平均为0.006 3×10–3μm2)，孔隙类型以粒间孔、粒内孔和微裂缝为主，微米–纳米级孔隙为页岩气的赋存提供了储集空间；孔隙总孔容为0.025 5~0.051 7 mL/g，平均0.038 9 mL/g，总比表面积为12.64~40.98 m2/g，平均28.43 m2/g，微孔(<2 nm)、介孔(2~50 nm)的孔容与比表面积呈良好的正相关性，宏孔(>50 nm)孔容与比表面积则相关性不明显，表明微孔和介孔是阳泉区块煤系页岩气储集的主要载体。总体来说，阳泉区块上古生界煤系页岩具有较好的页岩气储集性能，但页岩储层可压裂性较差，影响页岩气的开发。
|
| 关 键 词： | 页岩气储层 煤系页岩 储集物性 孔隙结构 阳泉区块 沁水盆地 |
| 收稿时间： | 2020-09-12 |
Characteristics of shale gas reservoir in Upper Paleozoic coal measures in Yangquan Block,Qinshui Basin |
| |
| Abstract: | Shale reservoir characteristics are the basic content of shale gas storage capacity evaluation. In order to explore the properties of high-evolved coal-measures shale gas reservoirs and optimize favorable reservoirs, various experimental methods of rock pyrolysis, X-ray diffraction, scanning electron microscopy, high-pressure mercury intrusion, low-temperature N2 and CO2 gas adsorption were applied to the Qinshui Basin. Reservoir characteristics were studied with core samples of coal-measure shale core from the Upper Paleozoic in Yangquan Block. The results show that the Upper Paleozoic coal-measures shale in Yangquan Block of the Qinshui Basin has a high content of organic carbon(average TOC is 4.9%), is in an over-mature stage(average Rran is 2.32%), and has a high content of clay minerals(average is 50.0%), with the characteristics of low porosity and low permeability(average porosity of 6.61%, average permeability of 0.006 3×10–3 μm2). The pore types are mainly intergranular pores, intragranular pores and microcracks, and micro-nano-scale pores provide the storage space for the occurrence of shale gas; the total pore volume of pores is 0.025 5-0.051 7 mL/g, the average is 0.038 9 mL/g, the total specific surface area is 12.64-40.98 m2/g, the average is 28.43 m2/g, the pore volume of the micropores(< 2 nm), and the mesopores(2-50 nm) has a good positive correlation with the specific surface area, while the pore volume of macropores(>50 nm) has no obvious correlation with the specific surface area, indicating that the micropores and the mesopores are Yangquan blocks. The main carrier of coal-measure shale gas accumulation. In general, the Upper Paleozoic coal-measure shale in the Yangquan Block has good shale gas storage performance, but the shale reservoir has poor fracturing properties, which will affect the development of shale gas. |
| |
| Keywords: | |
|
| 点击此处可从《煤田地质与勘探》浏览原始摘要信息 |
| 点击此处可从《煤田地质与勘探》下载免费的PDF全文 |
|
