Characterization of Microscopic Pore Structures in Shale Reservoirs of Toolebuc Formation in the E Basin,Australia
Received date: 2014-04-23
Revised date: 2014-10-15
Online published: 2015-05-10
In order to investigate the nanostructure morphology of shale reservoirs of the Toolebuc Formation,organic geochemical and X-ray diffraction experiments are used to measure the mineral composition and argon ion polishing-SEM,liquid nitrogen adsorption and high pressure mercury experiments are used to analyze the pore types and structures of Toolebuc shale.Result shows that shale of Toolebuc Formation is high abundance marine shale,the content of brittle minerals is 55%,and can be fractured.The average porosity of shale is 15%,while the permeability ranges from 0.002×10-3μm2 to 0.116×10-3μm2.Research shows that pores of shale can be classified into six types: Inter-particle pores between clay minerals,mineral pores in rock skeletons,pores in organic,apertures in paleontology fossils,organic acid solution pores and micro-fractures,of which the most common ones are inter-particle pores between clay minerals and mineral pores in rock skeletons.The pores size distribution of shale is complex,which includes not only predominant mode-pores,but also a certain amount of macro-pores and micro-pores.Macro-pores and mode-pores provide most of pore volume,it is good for the accumulation of free gas,and mode-pores and micro-pores provide most of specific surface area,and it is good for the preservation of absorbed gas.The types and distribution of pores in shale are obviously controlled by the diagenetic evolution and thermal evolution.
GE Yan，XIE Ying-gang，HU Yun-ting，LI Le-zhong，GUO Xiao-bo，SHI Xue-feng，GU Feng . Characterization of Microscopic Pore Structures in Shale Reservoirs of Toolebuc Formation in the E Basin,Australia[J]. Natural Gas Geoscience, 2015 , 26(5) : 979 -985 . DOI: 10.11764/j.issn.1672-1926.2015.05.0979
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