Abstract: Kelasu tectonic belt is the key area for natural gas exploration in the Tarim basin, and its main gas-bearing series are the Lower Cretaceous Bashijiqike formation where tectonic fissures are generally developed, which is considered as the key factor for the high and stable deliverability of low-porosity sandstone reservoirs. Based on the study of the characteristics of tectonic fissure development and fissure zone distribution in the subsalt deep faulted-anticline reservoirs of Kelasu tectonic belt, the paper studies the relationship between the fissure zone combination and its deliverability, identifies that the reservoir fractures are dominated by unfilled-half-filled high-angle fractures which are mainly tensile fractures or tensile shear fractures and are characterized by zonal distribution with the fracture zone width and interval of 10~40 m and 10~50 m, respectively. According to the differences in genesis and distribution of fracture zones, 3 types of reservoir fracture zones are classified, i.e., E-W trending fracture zone, N-S trending fracture zone and netlike fracture zone. According to the characteristics of reservoir fracture development and fracture zone spatial combination, the reservoir can be divided into 3 kinds of regions, namely Class Ⅰ high-deliverability region, Class Ⅱ medium-high deliverability region and Class Ⅲ low-deliverability region