Through the comparative analysis on reservoir sand bodies, transverse and longitudinal water, the He8 water in the north of East-2 of Sulige gasfield is divided into 5 water types which are locally edge (bottom) water of channel sand,“lens”water detained in the low-lying area of channel bottom,“lens”water sealed by tight sandstone,“lens”water formed by“single”sandstone body and residual water of dense layer. By the analysis of characteristics of water profile and plane, it is thought that, most of the water layers and water layers of water in longitudinal direction are single thin layers, while the isolated water is presented in the transverse direction, or the water layer sealed by dense layer; in plane, the water is distributed dispersedly comparatively, without the regional discontinuous water. According to comprehensive analysis, the main factors that controlled the water distribution are studied: the channel sand distribution of each layer is the base of formation water distribution; the regional tectonic has little effect on water distributions which are controlled by local sandstone micro-tectonic in partial isolated water system; and the reservoir heterogeneity leads to the fact that the water in reservoir is always isolated and non-communicating in transverse direction.