Abstract: Aiming at the complex geological conditions of Sulige gasfield, the key technology study on the favorable area selection and deployment mode of large well group is required to guarantee the development effects of large well group. According to the distribution characteristics of effective reservoirs in different Upper and Lower Paleozoic gas reservoirs of the Sulige gasfield, the comprehensive research on seismic geology was conducted to create the three-dimensional geologic modeling technique based on "geological database target and multipoint geological statistics" as well as the Lower Paleozoic favorable area selection technology based on "binary migration and accumulation mode of low-permeability carbonate gas reservoirs" in tight sandstone reservoirs, so as to confirm the deployment areas of large well group. Meanwhile, through well pattern optimization, well type selection and the establishment of deployment ideas for large well group, the deployment mode of large well group was determined to enhance the reserve utilization of multi-layer reservoirs and gas field recovery ratio. The key development technology of large well group has been successfully applied in Sulige gasfield, which can effectively solve the technical issues in the organic combination among geology, seismic and ground, and further improve gasfield exploitation efficiency and achieve the high efficient development with low cost.