织金区块不同煤组煤层气产能评价及影响因素研究

Productivity Evaluation and influencing Factors of Different Coal Groups in Zhijin Block

根据不同煤组的地质特点,开展不同煤组煤层气排采试验,研究表明下煤组产能最高,中煤组和上煤组次之,与下煤组地质条件最好的特征一致;通过单煤层、单煤组、多煤组组合评价认为直井下煤组具有1 200~3 275 m^3/d产能,中煤组具有400~900 m^3/d产能,上煤组具有500~1 000 m^3/d产能;下煤组单煤层水平井具有3 000~5 980 m^3/d的产能;不同煤组煤层气产能主要影响因素为地质条件、压裂改造效果、排采制度。

According to the geological characteristics of different coal groups, different coal group mining tests are carried out. The results show that the productivity of the lower coal group is the highest, followed by that of the middle coal group and the upper coal group, which is consistent with the best geological conditions of the lower coal group. Through the evaluation of single coal seam,single coal group and multi coal group combination, it is concluded that the lower coal group has a productivity capacity of 1 200~3 275 m^3/d, the middle coal group has a productivity capacity of 400~9 00 m^3/d, and the upper coal group has a productivity of capacity 500 ~1 000 m^3/d;the single coal seam horizontal well of the lower coal group of coalbed methane has a production capacity of 3 000~5 980 m^3/d;the main factors affecting the production capacity of different coal groups are the geological conditions, the effect of fracturing and reconstruction, and the drainage system.