Characterization of Microscopic Pore Structures in Shale Reservoirs
详细信息
- 责任者：Yang Feng (Key Laboratory of Petroleum Engineering ; Ministry of Education ; China University of Petroleum ; Beijing 102249 ; China) ; Ning Zhengfu
- 刊名：Acta Petrolei Sinica
- 出版年：2013
- 卷期：34(2)
- 关键词：碎屑岩储集层 ; clastic reservoirs ; 孔隙结构 ; pore structure
- 页码：p.301-311
- 图表：illus., 3 tables, 32 refs.
- 分类号：1003
- issnNo：ISSN0253-2697
- isbnNo：CN11-2128/TE
摘要
Nanostructure morphology of shale reservoirs was investigated using a field-emission environmental scanning electron microscope and adsorption-desorption isotherms were measured with low-temperature nitrogen adsorption experiments.Combined with high-pressure mercury injection,further investigation into characterization of pore structures in shale reservoirs was gained.Results show that pores in shale reservoirs are generally in a nanometer grade,it can be classified into five types: organic nanopores,interparticle pores between clay minerals,mineral pores in rock skeletons,apertures in palaeontologic fossils and microfractures,of which the most common ones are organic nanopores and interparticle pores between clay minerals.The pore-size distribution of shales are complex,which includes not only predominant mesopores(2~50 nm),but also a certain amount of micropores(<2 nm) and macropores(>50 nm).Micropores and mesopores with a diameter less than 50 nm amount to most of specific surface area and pore volume of shale pores,and mainly are places for gas adsorption and storage.Shale is characterized by high threshold pressure,good-sorting pore throats,poor connectivity and low efficiency of mercury withdrawal.In addition,mesopores in shale apparently contribute a lot to gas percolation,while micropores in shale are mainly for gas storage.
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