The seismic sedimentology is occurred under the oil-gas exploration development, has the bright technical characteristic and the better application prospect. The article elaborated the seismic sedimentology's concept and the discipline characteristic, thought the earthquake sedimentology may divide into the seismic geomorphology and the reservoir seismography according to the research criterion, propose research method from the application aspects. The article proposed the smallest isochronal strata unit concept at the first time, namely three-phase (seismic, oil well logging, core) unifies the unification when the research the well and seismic, is smallest geology chart unit with depositional analysis. A case study is present in this article, where we use seismic sedimentology analysis technique for sediment face analysis at lithology-reservoir in Palezoic erathem of D gas field in ERDOS Basin. The case study proves the favorable knowledge predominance in sediment face analysis and lithology-reservoir prediction by using seismic seidimentology face analysis technique.