文档介绍:: .
뗚™ 뻭℀뗚⌀웚 troleum,Beijing102249,China)
Abstract:Nanostructure morphology of shale reservoirs was investigated using a field-emission environmental scanning electron mi-
croscope 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,inter-
particle 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(2~50nm),but also a certain amount of micropores(<2nm)and macro-
pores(>50nm).Micropores and mesopores with a diameter less than 50nm 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.
Key words:shale;nanopore;SEM;nitrogen adsorption;high-pressure mercury injection
近年来 随着非常规油气藏勘探开发的深入 页岩 储层的结构与孔隙特性不仅影响了气体的储集和吸附
, ,
能力 而且也影响了气体的运移[ ]
由于储集丰富的油气资源而突破了将其作为烃源岩或 , 9-10 。