Abstract: Underbalance drilling is one of the most effective drilling technologies in natural gas exploration.Good results have been made in the prospecting areas of Dagang Oilfield and Daqing Oilfield,et al.Some forward requirements for the identification and evaluation of geological logging with drilling gas-bearing reservoirs have been carried out by the application of underbalance drilling technology.In this paper,the localization of logging techniques for gas has been analyzed,and the application method of cutting gas analysis technology for recognition gas-bearing reservoirs in natural gas exploration has been discussed on the basis of characteristics of underbalance drilling technology,and some application examples have been shown.