The concentration of carbon dioxide gas in atmosphere is remarkably increasing because of burning fossil fuels, such as coal, natural gas and oil. CO2 is an important Greehouse Gas which results in global warming, and it also threatens human life security and social economy sustainable developing. CO2 geological storage is considered to be a fairly significant way to seal CO2 permanently, it can also slow down global warming. Coals have a super adsorption capacity, especially to CO2, because of the special dual porosity and huge specific surface. Therefore, CO2 can be injected and sequestrated in coal seams by geological storage. Geological storage of CO2 can not only reduces its concentration in atmosphere, but also can enhance coalbed methane production synchronously. The paper discusses CO2 injection and sequestration in coal bed to enhance CBM production mechanism, feasibility and propose a technical route. Experiments show that the technical route of CO2 geological storage to enhance CBM production is feasible, and the technical of CO2 geological storage is good for slowing down globle warming and reducing gas accidents.

Improving the productivity of CBM wells is one of the most emergency issues in the development of CBM. Preliminary characteristics of water discharge can indicate the productivity to some extent. Based on the data of 49 CBM wells in Fanzhuang Block, Qinshui basin, this paper makes research on the relations between the Preliminary characteristics of water discharge and CBM well production by theory of reservoir engineering. According to the index and quantity of water discharge, the CBM wells were divided into five types. Contrast this block, develop the I-type wells preferentially, reduce the fracture strength for the II-type wells, improve the fracturing technology for the IV-type wells, and shouldnt take the III & V-type wells into consideration generally.