Control Mechanism and Law of Geological Structure Affected to Production Capacity of Coal Bed Methane Well

The paper discussed the contral mechanism of the structure evolution and structural shape affected to the production capacity of the coal bed methane well.In combination with the practices in Fenzhuang Mining Area of Qinnan Area,the paper analyzed the contral law of the geological structure to the distribution of the c oal bed methane wells with different production capacity. The study showed that the structure evolution would control the full accumulation process of coal bed methane. The later structure shape would be critical important to the migration and storage of the coal bed methane.The two wings of the fold and the syncline core would have hi gh methane content and the anticline core and the open fault nearby would have low methane content.The study on the Fanzhuang Mining Area showed that the produc tion capacity of coal bed methane well would have a close relationship to the structure location.The high production wells mainly distributed at the wings of the fold stru cture,the subordinate anticline core of synclinorium and the subordinate syncline core of anticlinorium and the average daily gas production could reach to 1 0005 000 m3. The low production coal bed methane well and the water production well mainly distributed at the subordinate anticline core of anticlinorium and around the normal f aults and the average daily gas production would reach to less than 500 m3.