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- Title
Pore characteristics and main controlling factors of mud shalein coal-bearing strata of eastern Ordos Basin.
- Authors
Chen Yue; Ma Dong-min; Wu Sheng; Li Xin-hu; Fang Shi-yue; Guo Chen
- Abstract
Since the shale gas resource potential is very considerable and the mud shale in coal-bearing strata developed broadly in eastern Ordos Basin,enhancing the research of pore characteristics of the mud shale is significant in coalbed methane and shale gas joint exploration and development.In this paper,the pore characteristics and main controlling factors of the mud shale in Shanxi and Taiyuan Formations of the study area were analyzed in detail through systematic experiments such as SEM observation,porosity and permeability measurement,low-temperature nitrogen adsorption,organic geochemistry test and X-ray diffraction mineral analysis.The results show that the pore genetic types in mud shale are mainly intergranular pores,intracrystalline pores,moldic pores,secondary dissolution pores and organic pores,and the micro-fractures mainly develop in crystals and between crystals of brittle minerals and between clay mineral particles with a width of tens nanometers.The porosity of mud shale ranges from 1.05% to 1.59% and its permeability ranges from 0.001×10-3 to 0.142×10-3μm2.In addition,the porosity and permeability of mud shale in Shanxi Formation are better than that in the Taiyuan Formation.Micropores and mesopores dominate the mud shale pores and the mesopores provide most space for gas adsorption.Most of them pores are open and ventilate.The total organic carbon content,maturity and inorganic minerals are the main controlling factors of the pores development in mud shale.The efficient pores decrease as total organic carbon content increases,because the residual hydrocarbon generated from organic matter may block some small size pores in low maturity mud shale.A large number of micropores and mesopores develop within and between clay mineral particles,resulting in increasing reservoir space.Besides,quartz minerals are favorable for the development of big size pores and fractures that can improve the permeability of mud shale.
- Subjects
CHINA; SHALE gas; GEOLOGICAL basins; COALBED methane; NATURAL gas prospecting; NITROGEN absorption &; adsorption
- Publication
Natural Gas Geoscience, 2018, Vol 29, Issue 2, p4
- ISSN
1672-1926
- Publication type
Article
- DOI
10.11764/j.issn.1672-1926.2018.01.008