The effects of pay formation combination on productivity of coalbed methane well in Qinshui basin;

Sequence stratigraphy & lithofacies palaeogeography in Qinshui Basin;

Micro-pilot test for enhanced coalbed methane recovery by injecting carbon dioxide in south part of Qinshui Basin;

Aimed at general situation of CBM in Qinshui Basin,strata condition and exploitation condition,introduced parameter well,producing well,multi-bran chsurface CBM horizontal development well and cluster wells drilling technology,drilling tool assemblage,well structure and well quality requirements.

Based on the data collected from coal elxploration, coalbed exploration and development in the Southeastern Qinshui Basin, controlling factors on the accumulation and permeability are discussed in this paper.