Based on the laboratory test and development data of Yanchuannan Block in the southeastern margin of the Or? dos Basin，this paper studied the role of burial depth in the reservoir petrophysical properties，development performance，as well as the enrichment and production of coalbed methane reservoirs. The quantitative evaluation index and calculation formula were put forward for the enrichment and high-production zone of deep coalbed methane reservoirs.The results show that the deeper burial depth can lead to the more enriched coalbed methane and the greater maximum vitrinite reflectance.It indicates that the paleo-geotemperature continues to increase with the greater burial depth，resulting in the constant growth in hydrocarbon generation capacity. Coupled with the high-temperature hydrothermal baking，the paleo-geotemperature is rather higher than the normal value，leading to massive coalbed methane；thus the CH4 content tends to be higher with the greater burial depth in the study area. Burial depth has a dual influence on the production of coalbed methane wells. On one hand，an exponential decrease is observed in the reservoir permeability with the greater burial depth，down to about 0.1 mD at 1 500 m around. On the other hand，however，the adsorption time declines with the greater burial depth，namely that the desorption efficiency grows，which is favorable for the development of deep coalbed methane reservoirs.Based on the gas content，permeability and adsorption time，the calculation formula for the gas production index is devised，and this index has a good correlation with the single well production. The enrichment and high-production zone of coalbed methane in the study area can be correctly predicted. The gas production index of the study area rises first and then drops with the greater burial depth. It reaches the highest at the burial depth around 1 100 m，revealing the most favorable development zone in the study area.