Study of characteristics and formation stages of macroscopic natural fractures in coal seam #3 for CBM development in the east Qinnan block, Southern Quishui Basin, China
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Macroscopic natural fractures are well developed in coal seam #3 in east Qinnan block.

Three groups of exogenous fractures formed during the Yanshanian period.

Three groups of exogenous fractures formed during the Himalayan period.

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