DB1气田位于塔里木盆地库车坳陷克拉苏构造带西段，天然气储量规模超过千亿立方米。该气田构造地质条件复杂，地表为山体和砾石堆积区，地下发育膏盐层，盐上以断层传播褶皱为主，盐下发育断层转折褶皱。认为DB1构造是由受断裂控制的复杂断块组成，断裂既影响储层发育，是连通烃源岩与储层的通道和油气聚集的控制因素；又控制断块形态及油气分布，直接决定了油气的保存与破坏。研究断裂的展布规律是明确气藏特征与规模的关键。

DB1 gasfield is situated in the western part of Kelasu structural belt in Kuqa depression, the gas reserve in DB1 is more than 1 000×108 m3. The structural and geological conditions are very complicated, there are thick gravel areas and high mountains on the surface, evaporate salt bed developed underground. The structural styles are mainly fault\|propagation folds above the salt layers and fault\|bend folds under it. The research concludes that DB1 structure is complicated, in which the faults control hydrocarbon's accumulation and structural characteristics, not only influence the reservoir, but also connect to reservoir and source rock, and decide the condition of the reservoir preserved or destroyed. Above all, it is the key factor to study fault characteristics which could make us know DB1 gas field better.