Petroleum Exploration and Production Research Institute,SINOPEC,Beijing　 100083,China

The production effect of the deep coalbed gas field in Yanchuannan area at Southeastern Ordos is better than expected,in which the No. 2 coal seam of the upper Permain Shanxi formation as the main coal seam is built and com- mercially produced, revealing that the deep coalbed methane has a great exploration and development potential. Through the systematic analysis of structural features,reservoir characteristics and controlling effects on the CBM en- richment and high-yield of the main coal seam,combined with the dynamic production data of the gas field,it is con- sidered that the model of deep CBM enrichment and high-yield in Yanchuannan area is gas content-permeability cou- pling control,of which in the primary fissure development zone with buried depth less than 1 000 m,it is self-generated plus self-storage type,while in the secondary fissure development zone with buried depth greater than 1 000 m,it is en- dogenous generated plus exogenetic-storage type. Upon this basis,the index system of deep CBM evaluation and selec- tion is established,then four favorable areas of gas enrichment and high-yield are optimized,which support for the fine drainage and stable production of the gas field,also provide reference for the exploration and development of other deep CBM areas.

中石化科技攻关资助项目(G5800-17-ZS-YTB028)；

CHEN Gang,HU Zongquan. Discussion on the model of enrichment and high yield of deep coalbed methane in Yanchuannan area at South- eastern Ordos Basin[J]. Journal of China Coal Society,2018,43(6):1572-1579.