Coal metamorphism controlling regulation on the development of poresand fractures in low-medium rank coal reservoirs
Received date: 2016-12-02
Revised date: 2017-01-18
Online published: 2017-04-10
As coal metamorphism is a key factor controlling the physical properties of coal reservoirs,the development characteristics of pores and fractures show significant differences in different ranks.In this paper,based on the methods of scanning electron microscopy(SEM),fluorescence microscopy observation,mercury intrusion,low-temperature liquid nitrogen adsorption,nuclear magnetic resonance(NMR) and computed tomography(CT),taking the coal seam of Shanxi Formation in eastern Ordos Basin,the characteristics and variation of coal reservoirs in different ranks are studied and the controlling regulation of metamorphism on the development of pores and fractures in coal are revealed.The results show,as the coal rank increases,the quantity of plant tissue pores and intergranular pores in coal decreases while the quantity of gas pores increases.The porosity of the coals varies in a wavelike fashion of ‘decreasing-increasing-decreasing’ as the coal rank increases.The proportion of mesopores and macropores decreases at first and then tends to be stable and the proportion of micropores and transition pores shows opposite variation with coal rank increasing.During coal metamorphism,the BET surface area and BJH total volume of adsorption pores decrease,the average pore diameter increases,the surface of adsorption pores becomes rough at first and then smooth,and the pore structure tends to be homogenized.As the coal rank increases,the quantity of fractures decreases firstly and then increases,their length increases and the fractures arranges regularly.
Key words： Ordos Basin; Metamorphism; Coal reservoir; Pores and fractures
Chen Yue，Tang Da-zhen，Tian Lin，Ma Dong-min，Fang Shi-yue，Chen Xi . Coal metamorphism controlling regulation on the development of poresand fractures in low-medium rank coal reservoirs[J]. Natural Gas Geoscience, 2017 , 28(4) : 611 -621 . DOI: 10.11764/j.issn.1672-1926.2017.02.007
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