Abstract：The paper used 3-D seismic data in Haila'er basin to identify three kinds of slope break zones—faulted slope break, sedimentary slope break and erosion slope break, among which the faulted sloped break is more developed and the latter two slope breaks has limited distribution in Haila'er basin; the litho-stratigraphic reservoirs were divided into 7 subclasses according to main genesis of oil/gas reservoirs, among which the gentle-slope faulted slope break zone controls lihtologic updip pinchout oil/gas reservoir, lithologic lens reservoir and overlap reservoir; the steep-slope faulted slope break zone controls sand/gravel stone reservoir and overlap reservoir; buried hill reservoir is developed above the faulted or erosion slope break zones, inconformity and faulted slope break control jointly inconformity reservoir; palaeochannel sandstone reservoir is generally located in the sub-sag near slope break zone. It is thus clear that the slope break zone and surroundings are the fields of interest for developing litho-stratigraphic oil/gas reservoirs
