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川西坳陷富有机质页岩孔隙特征
吴伟,刘惟庆,唐玄,周雪晴,郑伟,宋党育
0
(河南理工大学资源环境学院,河南焦作 454003;中国地质大学能源学院,北京 100083;长江大学地球物理与石油资源学院,湖北武汉 430100)
摘要:
采用低温氮气吸附法和场发射扫描电镜对川西坳陷富有机质页岩进行孔隙特征研究。结果表明:川西坳陷富有机质页岩比表面积为3.404~19.473 m2/g,远大于常规储层比表面积,大多数比表面积由微孔和过渡孔提供;页岩具有从微孔到中孔等一系列连续性孔隙,孔隙平均孔径为3.06~7.82 nm,孔隙类型以平行板状孔和一端封闭的盲孔为主,同时有一定量的墨水瓶状孔;页岩比表面积与有机碳含量呈正相关,有机碳含量、热演化程度与孔径呈负相关性,石英等脆性矿物和比表面积有弱正相关性。
关键词:  孔隙结构  孔隙类型  氮气吸附  川西坳陷
DOI:10.3969/j.issn.1673-5005.2014.04.001
投稿时间:2013-12-15
基金项目:油气资源与探测国家重点实验室开放课题(PRP/open-1109,PRP/open-1207);河南省教育厅自然科学课题(12B170005);教育部新世纪优秀人才支持计划(NCET-10-0133) 
Organic rich shale pore characteristics of Western Sichuan Depression
WU Wei,LIU Weiqing,TANG Xuan,ZHOU Xueqing,ZHENG Wei,SONG Dangyu
(School of Resources and Environment, Henan Polytechnic University, Jiaozuo 454003, China;School of Energy Resources, China University of Geosciences, Beijing 100083, China;Geophysics and Oil Resource Institute, Yangtze University, Wuhan 430100, China)
Abstract:
The pore characteristics of the organic rich shale in Western Sichuan Depression were studied by using low temperature nitrogen adsorption method and field emission scanning electron microscopy. The results show that the surface area of organic rich shale in Western Sichuan Depression ranges from 3.404 m2/g to 19.473 m2/g, which is far more than that of conventional reservoir. The surface area of shale is mainly provided by micropore and transition pore. The shale develops a series of continuous porosity from micropore to mesoporous. The average pore diameter ranges from 3.06 nm to 7.82 nm. The pore types are mainly parallel-plate pore and blind pore, which is closed at one end with certain amounts of ink-bottle pore at the same time. The surface area of shale and content of organic carbon form positive correlation. The content of organic carbon and degree of thermal evolution are negatively correlated with aperture. Lastly fragile mineral such as quartz is weak positively correlated with surface area.
Key words:  pore structure  pore type  nitrogen adsorption  Western Sichuan Depression
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